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1

Shukla, Tulsi L., and Steven J. Duranceau. "Comparing Hydrogen Peroxide and Sodium Perborate Ultraviolet Advanced Oxidation Processes for 1,4-Dioxane Removal from Tertiary Wastewater Effluent." Water 15, no. 7 (2023): 1364. http://dx.doi.org/10.3390/w15071364.

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Ultraviolet advanced oxidation processes (UV-AOPs) were compared using sodium perborate (UV/NaBO3 AOP) or hydrogen peroxide (UV/H2O2 AOP) for 1,4-dioxane removal from tertiary wastewater effluent. Both UV-AOPs were also tested with the addition of acetic acid. Results revealed that sodium perborate performed similarly to hydrogen peroxide. The UV/NaBO3 AOP with 6 milligrams per liter (mg/L) as H2O2 resulted in 43.9 percent 1,4-dioxane removal, while an equivalent UV/H2O2 AOP showed 42.8 percent removal. Despite their similar performance, NaBO3 is approximately 3.3 times more expensive than H2O2. However, the solid form of NaBO3 can provide a major benefit to remote and mobile operations. Unlike H2O2 solution, which degrades over time and requires repeated costly shipments, NaBO3 is a convenient source of H2O2, and a long-term supply can be shipped at once and mixed into solution as needed. The addition of acetic acid to a UV/H2O2 AOP was found to enhance 1,4-dioxane removal, increasing treatment effectiveness by 5.7%.
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2

Phornvillay, Surisa, Suwanan Yodsarn, Jiraporn Oonsrithong, Varit Srilaong, and Nutthachai Pongprasert. "A Novel Technique Using Advanced Oxidation Process (UV-C/H2O2) Combined with Micro-Nano Bubbles on Decontamination, Seed Viability, and Enhancing Phytonutrients of Roselle Microgreens." Horticulturae 8, no. 1 (2022): 53. http://dx.doi.org/10.3390/horticulturae8010053.

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Microbial contamination commonly occurs in microgreens due to contaminated seeds. This study investigated the decontamination effects of water wash (control), 5% hydrogen peroxide (H2O2), UV-C (36 watts), advanced oxidation process (AOP; H2O2 + UV-C), and improved AOP by combination with microbubbles (MBs; H2O2 + MBs and H2O2 + UV-C + MBs) on microbial loads, seeds’ viability, and physio-biochemical properties of microgreens from corresponding roselle seeds. Results showed that H2O2 and AOP, with and without MBs, significantly reduced total aerobic bacteria, coliforms, Escherichia coli (E. coli), and molds and yeast log count in seeds as compared to the control. Improved AOP treatment of H2O2 + UV-C + MBs significantly augmented antimicrobial activity against total bacteria and E. coli (not detected,) as compared to control and other treatments due to the formation of the highest hydroxy radicals (5.25 × 10−13 M). Additionally, H2O2 and combined treatments promoted seed germination, improved microbiological quality, total phenolic, flavonoids, and 2,2-diphenyl-1-picrylhydrazyl radical (DPPH•) activity of the grown microgreens. Ascorbic acid content was induced only in microgreens developed from H2O2-treated seeds. Single UV-C treatment was ineffective to inactivate the detected microorganism population in seeds. These findings demonstrated that improved AOP treatment (H2O2 + UV-C + MBs) could potentially be used as a new disinfection technology for seed treatment in microgreens production.
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3

Ko, K. B., C. G. Park, T. H. Moon, et al. "Advanced H2O2 oxidation for diethyl phthalate degradation in treated effluents: effect of nitrate on oxidation and a pilot-scale AOP operation." Water Science and Technology 58, no. 5 (2008): 1031–37. http://dx.doi.org/10.2166/wst.2008.461.

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One of the objectives of this study was to delineate the effect of nitrate on diethyl phthalate (DEP) oxidation by conducting a bench-scale ultraviolet (UV)/H2O2 and O3/H2O2 operations as suggested in a previous study. We also aim to investigate DEP oxidation at various UV doses and H2O2 concentrations by performing a pilot-scale advanced oxidation processes (AOP) system, into which a portion of the effluent from a pilot-scale membrane bioreactor (MBR) plant was pumped. In the bench-scale AOP operation, the O3 oxidation alone as well as the UV irradiation without H2O2 addition could be among the desirable alternatives for the efficient removal of DEP dissolved in aqueous solutions at a low DEP concentration range of 85±15 μg/L. The adverse effect in the UV/H2O2 process was significantly greater than that in the UV oxidation alone, and its oxidation was almost halved by the nitrate. However, the nitrate clearly enhanced the DEP oxidation in the O3 oxidation and O3/H2O2 process. Especially, the addition of nitrate almost doubled the DEP oxidation efficiency in the O3/H2O2 process. The series of pilot-scale AOP operations confirmed that about 30–50% of DEP dissolved in the treated MBR effluent streams was, at least, oxidized by the O3 oxidation alone as well as the UV irradiation without H2O2 addition. The UV photolysis of H2O2 was most effective for DEP degradation with an H2O2 concentration of 40 mg/L at a UV dose of 500 mJ/cm2.
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4

Lester, Y., D. Avisar, I. Gozlan, and H. Mamane. "Removal of pharmaceuticals using combination of UV/H2O2/O3 advanced oxidation process." Water Science and Technology 64, no. 11 (2011): 2230–38. http://dx.doi.org/10.2166/wst.2011.079.

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Water and wastewater effluents contain a vast range of pharmaceutical chemicals. The present study aims to determine the potential of the advanced oxidation technology UV/H2O2/O3 and its sub-processes (i.e. UV, UV/H2O2, UV/O3, O3 and H2O2/O3) for the degradation of the antibiotics ciprofloxacin (CIP) and trimethoprim (TMP), and the antineoplastic drug cyclophosphamide (CPD) from water. Creating AOP conditions improved in most cases the degradation rate of the target compounds (compared with O3 and UV alone). H2O2 concentration was found to be an important parameter in the UV/H2O2 and H2O2/O3 sub-processes, acting as •OH initiator as well as •OH scavenger. Out of the examined processes, O3 had the highest degradation rate for TMP and H2O2/O3 showed highest degradation rate for CIP and CPD. The electrical energy consumption for both CIP and CPD, as calculated using the EEO parameter, was in the following order: UV > UV/O3 > UV/H2O2/O3 > O3 > H2O2/O3. Whereas for TMP O3 was shown to be the most electrical energy efficient. Twelve degradation byproducts were identified following direct UV photolysis of CIP.
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5

Lakretz, Anat, Eliora Z. Ron, Tali Harif, and Hadas Mamane. "Biofilm control in water by advanced oxidation process (AOP) pre-treatment: effect of natural organic matter (NOM)." Water Science and Technology 64, no. 9 (2011): 1876–84. http://dx.doi.org/10.2166/wst.2011.077.

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The main goal of this study was to examine the influence of natural organic matter (NOM) on the efficiency of H2O2/UV advanced oxidation process (AOP) as a preventive treatment for biofilm control. Pseudomonas aeruginosa PAO1 biofilm-forming bacteria were suspended in water and exposed to various AOP conditions with different NOM concentrations, and compared to natural waters. H2O2/UV prevented biofilm formation: (a) up to 24 h post treatment – when residual H2O2 was neutralized; (b) completely (days) – when residual H2O2 was maintained. At high NOM concentrations (i.e. 25 mg/L NOM or 12.5 mg/L DOC) an additive biofilm control effect was observed for the combined H2O2/UV system compared to UV irradiation alone, after short biofilm incubation times (<24 h). This effect was H2O2 concentration dependent and can be explained by the high organic content of these water samples, whereby an increase in NOM could enhance •OH production and promote the formation of additional reactive oxygen species. In addition, maintaining an appropriate ratio of bacterial surviving conc.: residual H2O2conc. post-treatment could prevent bacterial regrowth and biofilm formation.
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6

Kudzin, Marcin, Renata Żyłła, Zdzisława Mrozińska, and Paweł Urbaniak. "31P NMR Investigations on Roundup Degradation by AOP Procedures." Water 11, no. 2 (2019): 331. http://dx.doi.org/10.3390/w11020331.

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The reactions of (N-(PhosphonoMethyl)Glycine) PMG with H2O2 in homogenous systems were investigated using 31P NMR (Nuclear Magnetic Resonance). These reactions were carried out in two reaction modes: without UV radiation and under UV radiation. The reactions of PMG with H2O2 without UV radiation were carried out in two modes: the degradations of PMG (0.1 mmol) by means of 5–10 molar excess of hydrogen dioxide (PMG-H2O2 = 1:5 and 1:10) and the degradation of PMG (0.1 mmol) in homogenous Fenton reactions (PMG-H2O2-Fe2+ = 1:10:0.05 and 1:10:0.1). All reactions were carried out at ambient temperature, at pH 3.5, for 48 h. The reactions of PMG (in Roundup herbicide composition, 12 mmol) with H2O2 under UV radiation (254 nm) were carried out using 5 × molar excess of H2O2 (60 mmol), in the pH range of 2 ≤ pH ≤ 12, for 6 h. In this mode of PMG oxidation, the splitting of C-P was observed in the ratios dependent on the applied pH of the reaction mixture.
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7

Azizah, Alif Nurul, and I. Nyoman Widiasa. "Advanced Oxidation Processes (AOPs) for Refinery Wastewater Treatment Contains High Phenol Concentration." MATEC Web of Conferences 156 (2018): 03012. http://dx.doi.org/10.1051/matecconf/201815603012.

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Petroleum Refinery wastewater is characterized by a high phenol content. Phenol is toxic and resistant to biological processes for treatment of the petroleum refinery wastewater. The combination of an AOP and a biological process can be used for treatment of the refinery wastewater. It is necessary to conduct a study to determine the appropriate condition of AOP to meet the phenol removal level. Two AOP configurations were investigated: H2O2 / UV and H2O2 / UV / O3. From each process samples, COD, phenol and pH were measured. The oxidation was carried out until the targeted phenol concentration of treated effluent were obtained. The better result obtained by using process H2O2 / UV / O3 with the H2O2 concentration 1000 ppm. After 120 minutes, the final target has been achieved in which phenol concentration of 37.5 mg/L or phenol degradation of 93.75%.
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8

Dwiasi, Dian Windy, Tien Setyaningtyas, and Kapti Riyani. "Penurunan Kadar Metilen Biru Dalam Limbah Batik Sokaraja Menggunakan Sistem Fe2O3-H2O2-UV." Jurnal Rekayasa Kimia & Lingkungan 13, no. 1 (2018): 78–86. http://dx.doi.org/10.23955/rkl.v13i1.10572.

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Telah dilakukan penelitian mengenai penurunan kadar zat warna metilen biru pada limbah cair batik Sokaraja dalam sistem Fe2O3-H2O2-UV. Dalam penelitian ini dilakukan beberapa perlakuan antara lain penentuan berat Fe2O3 optimum, konsentrasi H2O2 optimum, pH optimum, waktu optimum, dan efektivitas sistem AOP optimum. Dari hasil penelitian diperoleh kondisi optimum reaksi antara lain yaitu berat Fe2O3 sebanyak 0,5 gram, konsentrasi H2O2 sebesar 50 ppm, pH optimum pada pH 2, waktu kontak 10 jam, dan sistem AOP optimum pada sistem Fe2O3-H2O2-UV dengan persentase penurunan metilen biru sebesar 63 %.
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9

Guimarães, José Roberto, Regina Maura Bueno Franco, Regiane Aparecida Guadagnini, and Luciana Urbano dos Santos. "Giardia duodenalis: Number and Fluorescence Reduction Caused by the Advanced Oxidation Process (H2O2/UV)." International Scholarly Research Notices 2014 (December 7, 2014): 1–7. http://dx.doi.org/10.1155/2014/525719.

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This study evaluated the effect of peroxidation assisted by ultraviolet radiation (H2O2/UV), which is an advanced oxidation process (AOP), on Giardia duodenalis cysts. The cysts were inoculated in synthetic and surface water using a concentration of 12 g H2O2 L−1 and a UV dose (λ=254 nm) of 5,480 mJcm−2. The aqueous solutions were concentrated using membrane filtration, and the organisms were observed using a direct immunofluorescence assay (IFA). The AOP was effective in reducing the number of G. duodenalis cysts in synthetic and surface water and was most effective in reducing the fluorescence of the cyst walls that were present in the surface water. The AOP showed a higher deleterious potential for G. duodenalis cysts than either peroxidation (H2O2) or photolysis (UV) processes alone.
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10

Mohammed, Forqan, and Khalid M. Mousa. "Comparative Studied of Degradation of Textile Brilliant Reactive Red Dye Using H2O2, TiO2, UV and Sunlight." Al-Nahrain Journal for Engineering Sciences 22, no. 1 (2019): 31–36. http://dx.doi.org/10.29194/njes.22010031.

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In this study sunlight and UV radiation were used to compare the efficiency of decolorization of textile wastewater containing brilliant reactive red dye K-2BP (λmax = 534 nm) by the advanced oxidation process (AOP) using (H2O2/sunlight, H2O2/UV, H2O2/TiO2/sunlight, and H2O2/TiO2/UV). The results studied the effect of solution pH, applied H2O2 concentration, TiO2 concentration (nanoparticle), and initial dye concentration were studied. The experimental results showed that decolorization percentage with H2O2/sunlight and TiO2/H2O2/sunlight under the following conditions: - reaction time 150 of minutes, [ 500 ppm] H2O2, [100 ppm] TiO2, pH=3, initial dye concentration =15 ppm and at ambient temperature were 95.7% and 98.42% respectively. For the same conditions using H2O2/UV, H2O2/TiO2 /UV, the percentage of decolorization were 97.85% and 96.33% respectively. The results also indicated that the sunlight is more economic and cost-effective than UV radiation.
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11

Moreira, Carolina G., Mariana H. Moreira, Vanessa M. O. C. Silva, Henrique G. Santos, Daniele M. Bila, and Fabiana V. Fonseca. "Treatment of Bisphenol A (BPA) in water using UV/H2O2 and reverse osmosis (RO) membranes: assessment of estrogenic activity and membrane adsorption." Water Science and Technology 80, no. 11 (2019): 2169–78. http://dx.doi.org/10.2166/wst.2020.024.

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Abstract Removal of an endocrine disrupting compound, Bisphenol A (BPA), from water was investigated using two treatment processes, UV/H2O2 advanced oxidation (AOP) and reverse osmosis (membrane separation). Furthermore, changes in estrogenic activity using in vitro yeast estrogen screen assay as well as the adsorption of BPA by the membrane surface were evaluated. The best UV/H2O2 performance was obtained using the highest established values of all parameters, reaching 48% BPA removal. Within the investigated conditions of the AOP, when lower doses of UV were used, a higher removal efficiency was achieved at a higher initial concentration of BPA. However, the same behavior was not observed for the highest UV dose, in which the removal efficiency was not dependent on BPA initial concentration. In both cases, removal efficiency increased as H2O2 concentration increased. The formation of estrogenic by-products was observed in UV/H2O2. The membrane rejection efficiency varied from 60% to 84% and all experiments showed adsorption of BPA by the membrane surface. The RO membrane showed a greater BPA removal efficiency for samples containing 10 μg·L−1 than UV/H2O2 at the evaluated treatment conditions.
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12

Schulze-Hennings, U., and J. Pinnekamp. "Response surface method for the optimisation of micropollutant removal in municipal wastewater treatment plant effluent with the UV/H2O2 advanced oxidation process." Water Science and Technology 67, no. 9 (2013): 2075–82. http://dx.doi.org/10.2166/wst.2013.079.

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Experiments with the ultraviolet (UV)/H2O2 advanced oxidation process (AOP) were conducted to investigate the abatement of micropollutants in wastewater treatment plant effluent. The fluence and the starting concentration of H2O2 in a bench-scale batch reactor were varied according to response surface method (RSM) to examine their influence on the treatment efficiency. It was shown that the investigated AOP is very effective for the abatement of micropollutants with conversion rates typically higher than 90%. Empirical relationships between fluence, H2O2 dosage and the resulting concentration of micropollutants were established by RSM. By this means it was shown that X-ray-contrast media had been degraded only by UV light. Nevertheless, most substances were degraded by the combination of UV irradiation and H2O2. Based on RSM an optimisation of multiple responses was conducted to find the minimal fluence and H2O2 dosage that are needed to reach an efficient abatement of micropollutants.
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13

Tackaert, Rodrigo A., Aleksey N. Pisarenko, Elise C. Chen, et al. "Demonstrating process robustness of potable reuse trains during challenge testing with elevated levels of acetone, formaldehyde, NDMA, and 1,4-dioxane." Journal of Water Supply: Research and Technology-Aqua 68, no. 5 (2019): 313–24. http://dx.doi.org/10.2166/aqua.2019.134.

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Abstract Robustness of a demonstration potable reuse facility was evaluated through a series of system-wide chemical challenge tests spiking neutral low-molecular weight compounds (acetone, formaldehyde, N-nitrosodimethylamine (NDMA), and 1,4-dioxane) which are known to be challenging for removal through advanced treatment. Two advanced treatment train arrangements were compared: O3/BAC-MF/UF-RO-AOP and RO-AOP. Ozone and biological activated carbon (O3/BAC) offered significant attenuation of the smallest and most biologically degradable compounds tested: acetone and formaldehyde. These two compounds had limited reduction across the reverse osmosis (RO) membrane barrier and the different advanced oxidation process (AOP) setups used. 1,4-Dioxane was partially reduced across the oxidation barriers: 62% across ozonation and up to 95% across AOP depending on oxidant used and oxidant dose. Both a hydrogen peroxide (H2O2) based AOP (UV/H2O2) and a sodium hypochlorite (as HOCl) based AOP (UV/HOCl) demonstrated sufficient oxidation, providing no less than 0.5-log (68%) 1,4-dioxane attenuation required by regulators in the USA. NDMA was reduced across both UV/H2O2 and UV/HOCl from 157 to 267 ng/L to below the 10 ng/L established notification level for drinking water in California. Overall, addition of O3/BAC enhanced cumulative removal of all the spiked trace organic chemicals, providing greater protection against the spiked contaminants than RO-AOP alone. In addition, online total organic carbon (TOC) monitoring successfully captured the presence of the spiked chemicals.
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Elfiana, Elfiana, and Anwar Fuadi. "EFEKTIFITAS PROSES AOP BERBASIS H2O2 DALAM MENGHILANGKAN WARNA AIR GAMBUT BERDASARKAN PARAMETER KONSENTRASI ZAT ORGANIK." Jurnal Teknologi Kimia Unimal 5, no. 2 (2017): 45. http://dx.doi.org/10.29103/jtku.v5i2.89.

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Air gambut merupakan air permukaan yang banyak terdapat di daerah berawa dan daratan rendah, memiliki intensitas warna yang tinggi, pH rendah (pH 3-5) dan kandungan senyawa organik yang tinggi. Berdasarkan ciri-ciri tesebut penggunaan air gambut tanpa pengolahan berpengaruh sangat nyata terhadap resiko kesehatan. Oleh sebab itu perlu dilakukan suatu pengolahan yang murah, mudah dan handal. AOP (Advanced Oxidation Processes) berbasis H2O2 disebut juga proses oksidasi kimia lanjut dapat ditawarkan untuk mengolah air gambut dengan menghandalkan sifat reaktif radikal hidroksil (HO*) berasal dari eksitensi H2O2 dengan pancaran sinar UV selanjutnyaa disebut proses UV-Peroksidasi. Penelitian dilakukan untuk melihat efektifitas unjuk kerja proses UV-Peroksidasi dalam kemampuannya menurunkan konsentrasi zat organik air gambut salah satu penyebab air gambut berwarna dengan memvariasikan konsentrasi H2O2 0,0 – 0,11% pada panjang gelombang lampu UV 360 – 240 nm selama 0-240 menit. Hasil penelitian menunjukkan semakin besar konsentrasi H2O2 dan semakin lama waktu penyinaran semakin besar effisiensi penyisihan zat organik (%Rzat organik) yang diperoleh. Dari hasil percobaan yang telah dilakukan dapat disimpulkan bahwa dosis optimum H2O2 diperoleh pada konsentrasi 0,07% mampu menurunkan 98,56% konsentrasi organik pada waktu 240 menit dengan capaian warna air menjadi jernih sampai 5 TCU.
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15

Ijpelaar, G. F., M. Groenendijk, R. Hopman, and Joop C. Kruithof. "Advanced oxidation technologies for the degradation of pesticides in ground water and surface water." Water Supply 2, no. 1 (2002): 129–38. http://dx.doi.org/10.2166/ws.2002.0017.

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An overview of the Advanced Oxidation Processes (AOP) studied for the degradation of pesticides combined with the formation of by-products is presented. It was found that the degree of conversion of pesticides is about the same with the Fenton process and UV/H2O2 within the margin of practical application, but slightly different with ozone/H2O2. Bentazone is readily degraded by the latter process, but more persistent during water treatment with the Fenton process and UV/H2O2, whilst atrazine is difficult to convert with all of these processes. Although bromate formation cannot be avoided completely with ozone/H2O2, it can be realized with the Fenton process and UV/H2O2. Upon degradation of pesticides with UV/H2O2 nitrite is produced, the amount depending on the water quality with respect to the nitrate concentration. Based on the a-selective nature of the hydroxyl radical AOC is formed out of DOC, which indicates that ozone/H2O2, the Fenton process as well as UV/H2O2 should be applicable for the development of biological GAC filtration.
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16

Luiz, D. B., G. S. Silva, E. A. C. Vaz, H. J. José, and R. F. P. M. Moreira. "Evaluation of hybrid treatments to produce high quality reuse water." Water Science and Technology 63, no. 9 (2011): 2046–51. http://dx.doi.org/10.2166/wst.2011.468.

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Four tertiary hybrid treatments to produce high quality reused water, fulfilling Brazilian drinking water regulations, from a slaughterhouse's secondary treated effluent were evaluated. The pilot plant with a capacity of 500 L h−1 was set up and consisted of these stages: pre-filtration system (cartridge filter 50 micron, activated carbon filter, cartridge filter 10 micron), oxidation (H2O2) or second filtration (ceramic filter, UF) followed by UV radiation (90 L h−1). The best combination was T4: pre-filtration followed by H2O2 addition and UV radiation (AOP H2O2/UV). Disinfection kinetics by T4 followed pseudo first-order kinetics: kT4 = 0.00943 s−1 or 0.00101 cm2 mJ−1. Three different zones (A, B, C) were observed in the UV254 degradation kinetics (pseudo-first order kinetics): k' decreased over time (k′A > k′B > k′C).
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17

Ulliman, Sydney L., David B. Miklos, Uwe Hübner, Jörg E. Drewes, and Karl G. Linden. "Improving UV/H2O2 performance following tertiary treatment of municipal wastewater." Environmental Science: Water Research & Technology 4, no. 9 (2018): 1321–30. http://dx.doi.org/10.1039/c8ew00233a.

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18

Lekkerkerker, K., J. Scheideler, S. K. Maeng, et al. "Advanced oxidation and artificial recharge: a synergistic hybrid system for removal of organic micropollutants." Water Supply 9, no. 6 (2009): 643–51. http://dx.doi.org/10.2166/ws.2009.696.

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Dunea, the drinking water company for The Hague and surroundings, has as objective the production of drinking water of impeccable quality, particularly with respect to organic micropollutants. As organic micropollutants are only a minor part of the total natural organic matter, a challenge is posed in targeting the removal of a very small, specific part of the DOC, without removing all of the natural organic matter. In addition, organic micropollutants encompass a broad range of physicochemical properties, which make their removal by a single treatment step impossible. Combining AOP with artificial recharge and recovery, two complementary processes are expected to provide a hybrid system for organic micropollutant removal, according to the Dutch multiple barrier approach. Pilot-scale experiments with O3 and different advanced oxidation processes (UV/H2O2, UV/O3 and O3/H2O2) were carried out in cooperation between Dunea and ITT Wedeco. The pilot installation had a capacity of about 0.5–2.0 m3/h, with a varying LP-UV-dose, ozone dose and peroxide dose. Atrazine, isoproturone, carbamazepine, diclofenac and ibuprofen are well removed by UV/H2O2 as well as by O3/H2O2. In general, O3/H2O2 is a more energy efficient process compared to UV/H2O2. MTBE is best removed by O3/H2O2, Amidotrizoic acid and iohexol are best removed by UV/H2O2.
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19

JONES-IBARRA, A. M., C. Z. ALVARADO, CRAIG D. COUFAL, and T. MATTHEW TAYLOR. "Sanitization of Chicken Frames by a Combination of Hydrogen Peroxide and UV Light To Reduce Contamination of Derived Edible Products." Journal of Food Protection 82, no. 11 (2019): 1896–900. http://dx.doi.org/10.4315/0362-028x.jfp-19-175.

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ABSTRACT Chicken carcass frames are used to obtain mechanically separated chicken (MSC) for use in other further processed food products. Previous foodborne disease outbreaks involving Salmonella-contaminated MSC have demonstrated the potential for the human pathogen to be transmitted to consumers via MSC. The current study evaluated the efficacy of multiple treatments applied to the surfaces of chicken carcass frames to reduce microbial loads on noninoculated frames and frames inoculated with a cocktail of Salmonella enterica serovar Enteritidis and Salmonella enterica serovar Typhimurium. Inoculated or noninoculated frames were left untreated (control) or were subjected to treatment using a prototype sanitization apparatus. Treatments consisted of (i) a sterile water rinse, (ii) a water rinse followed by 5 s of UV-C light application, or (iii) an advanced oxidation process (AOP) combining 5 or 7% (v/v) hydrogen peroxide (H2O2) with UV-C light. Treatment with 7% H2O2 and UV-C light reduced numbers of aerobic bacteria by up to 1.5 log CFU per frame (P < 0.05); reductions in aerobic bacteria subjected to other treatments did not statistically differ from one another (initial mean load on nontreated frames: 3.6 ± 0.1 log CFU per frame). Salmonella numbers (mean load on inoculated, nontreated control was 5.6 ± 0.2 log CFU per frame) were maximally reduced by AOP application in comparison with other treatments. No difference in Salmonella reductions obtained by 5% H2O2 (1.1 log CFU per frame) was detected compared with that obtained following 7% H2O2 use (1.0 log CFU per frame). The AOP treatment for sanitization of chicken carcass frames reduces microbial contamination on chicken carcass frames that are subsequently used for manufacture of MSC.
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Khan, Atif, Saima Yasin, Hamayoun Mahmood, Shabana Afzal, and Tanveer Iqbal. "Advanced oxidative degradation of monoethanolamine in water using ultraviolet light and hydrogen peroxide." RSC Advances 14, no. 45 (2024): 33223–32. http://dx.doi.org/10.1039/d4ra05590j.

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21

Tsuneda, S., Y. Ishihara, M. Hamachi, and A. Hirata. "Inhibition effect of chlorine ion on hydroxyl radical generation in UV-H2O2 process." Water Science and Technology 46, no. 11-12 (2002): 33–38. http://dx.doi.org/10.2166/wst.2002.0713.

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UV-H2O2 process is widely used as an advanced oxidation process (AOP) for the treatment of chlorine volatile organic compounds (CVOCs) such as dichloromethane (DCM) with strong oxidativity of hydroxyl radical generated from photolysis of H2O2. The result of DCM degradation rate at different initial concentrations in UV-H2O2 processes indicated the inhibition effect of produced chlorine ions on DCM oxidation processes, because the first-order degradation rate constant increased with lower initial concentrations. A spin trapping adduct of hydroxyl radical with 5,5-dimethyl-1-pyrroline-n-oxide (DMPO) was quantified by ESR spectrometer after UV irradiation in the presence of different amounts of chlorine ion, and as a result, the chlorine ion was found to act as a hydroxyl radical scavenger, which resulted in decreasing DCM degradation rate. An UV-H2O2 reactor equipped with ion exchangers for removing chlorine ion achieved higher DCM degradation rate than that without ion exchangers.
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22

Ducoste, Joel J., and Scott M. Alpert. "Computational fluid dynamics modeling alternatives for UV-initiated advanced oxidation processes." Water Quality Research Journal 50, no. 1 (2014): 4–20. http://dx.doi.org/10.2166/wqrjc.2014.035.

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Design and optimization of ultraviolet-initiated (UV-initiated) advanced oxidation processes (AOPs) using hydrogen peroxide (H2O2) must consider both system configuration and chemical kinetics. Alternative approaches to modeling AOP systems have been proposed in the literature; yet, due to the complex nature of the reactions involved, the literature lacks clarity in the appropriate selection of a modeling approach to help define the UV/AOP system performance. Computational fluid dynamics (CFD) was compared to the numerical solution of a system of ordinary differential equations describing the reaction mechanism for hydroxyl radical production and methylene blue destruction and to a UV dose distribution analysis produced by a Lagrangian particle track in CFD with a given dose–response curve. Similar analyses were also performed to simulate the destruction of tris(2-chloroethyl) phosphate (TCEP) and tributyl phosphate (TBP), in two different photoreactors. To validate the simulations, the results of the models were compared to pilot reactor trials for methylene blue bleaching and literature data for TCEP and TBP. Modeling results suggest that the agreement of both CFD Eulerian and Lagrangian approaches to simulating the UV/H2O2 AOP is a function of reactor design, the water matrix, and operating conditions.
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Sturm, Michael Toni, Erika Myers, Dennis Schober, Clara Thege, Anika Korzin, and Katrin Schuhen. "Adaptable Process Design as a Key for Sustainability Upgrades in Wastewater Treatment: Comparative Study on the Removal of Micropollutants by Advanced Oxidation and Granular Activated Carbon Processing at a German Municipal Wastewater Treatment Plant." Sustainability 14, no. 18 (2022): 11605. http://dx.doi.org/10.3390/su141811605.

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Micropollutants have been increasingly detected at low concentrations in surface waters and may have harmful effects on humans, organisms, and the environment. As wastewater treatment plants are one of the main sources of micropollutants, conventional wastewater treatment methods and plants (mainly one to three cleaning stages) must be improved through an advanced (fourth) treatment stage. The optimal fourth treatment stage should be determined based not only on removal efficiencies but also on a holistic sustainability assessment that further considers the process’s adaptability, economic, environmental, and social parameters. The ability of a tertiary wastewater treatment plant to remove organic pollutants was investigated over four months using two different advanced treatment methods: (1) an advanced oxidation process (AOP) (using UV + H2O2) and (2) granulated activated carbon (GAC). The resulting average micropollutant removal efficiencies were 76.4 ± 6.2% for AOP and 90.0 ± 4.6% for GAC. As the GAC became saturated, it showed a decreasing performance from 97.6% in week one to 80.7% in week 13, after 2184 bed volumes were processed. For the AOP, adjusting the UV and H2O2 doses results in higher removal efficiencies. With 40 ppm H2O2 and 10 kJ/m2 UV, a removal of 97.1% was achieved. Furthermore, the flexibility and adaptability of the AOP process to adjust to real-time water quality, along with a lower resource consumption and waste disposal, make it a more promising technology when comparing the sustainability aspects of the two methods.
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24

Kanjal, Muhammad Imran, Majid Muneer, Muhammad Asghar Jamal, et al. "A Study of Treatment of Reactive Red 45 Dye by Advanced Oxidation Processes and Toxicity Evaluation Using Bioassays." Sustainability 15, no. 9 (2023): 7256. http://dx.doi.org/10.3390/su15097256.

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Advanced oxidation processes (AOPs) hold great promise to degrade and detoxify industrial-based effluents. The Reactive Red 45 dye aqueous solutions were treated with AOP using UV and gamma radiation alone and then in the presence of H2O2. The dye initial concentration, UV exposure time, and gamma-ray absorbed dose were optimized for maximum degradation. The degradation of dye was 88.85% and 77.7% using UV/H2O2 (1 mL/L) at a UV exposure time of 180 min for 50 mg/L and 100 mg/L, respectively. The degradation was noted as 100% and 93.82% as the solutions were subjected to a gamma/H2O2 (1 mL/L) absorbed dose of 2 kGy. The chemical oxygen demand was reduced to 77% and 85% by treating the dye samples with UV/H2O2 and gamma/H2O2, respectively. The removal efficiency (G-value), dose constant (k), D0.50, D0.90, and D0.99 for gamma-irradiated samples were also calculated. The reduction in toxicity for treated samples was monitored by using the Allium cepa, Hemolytic, and brine shrimp (Artemia salina) tests while the Ames test was performed for mutagenic assessment. The A. cepa test showed 39.13%, 36.36%, and 47.82% increases in root length (RL), root count (RC), and mitotic index (MI), respectively, in UV/H2O2-treated samples while 48.78%, 48.14%, and 57.14% increases were shown with gamma-ray in conjunction with H2O2. The hemolytic test showed 21.25% and 23.21% hemolysis after UV/H2O2 and gamma/H2O2 treatments, respectively. The brine shrimp (Artemia salina) test showed 84.09% and 90.90% decreases in the nauplii death after UV/H2O2 and gamma/H2O2 treatments, respectively. The mutagenicity of UV/H2O2-treated solutions was reduced up to 84.41% and 77.87%, while it was 87.83% and 80.88% using gamma/H2O2 using TA98 and TA100 bacterial strains, respectively. The advanced oxidation processes based on UV and gamma radiation in conjunction with H2O2 can be applied for the degradation and detoxification of textile waste effluents efficiently.
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25

Wang, Jenny, Achim Ried, Harald Stapel, et al. "A pilot-scale investigation of ozonation and advanced oxidation processes at Choa Chu Kang Waterworks." Water Practice and Technology 10, no. 1 (2015): 43–49. http://dx.doi.org/10.2166/wpt.2015.006.

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A two-year comprehensive advanced oxidation processes (AOPs) pilot test was completed for a Singapore waterworks in 2011–2013. This study focused on oxidative removal of spiked organic contaminants with ozone and ozone-based AOPs (ozone application together with hydrogen peroxide, which is necessary for AOPs). The ‘optimized H2O2 dosage’ test philosophy was verified during the test period – keeping the residual ozone at 0.3 mg/L in the water for disinfection purpose by minimizing the H2O2 dosage. This study also monitored the bromate concentration in both ozone- and AOP-treated water, and all the samples reported below the laboratory detection limit (<5 µg/L), which is also lower than the WHO Guidelines for Drinking Water Quality (<10 µg/L). For comparison, a low pressure UV-based AOP test was conducted in the final stage of the study. The electrical energy per order (EEO) value is compared with ozone- and UV-based AOPs as well. The results indicated that ozone-based AOP with an optimized hydrogen peroxide dosage could be the most energy efficient option for this specific water matrix in terms of most selected compounds.
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26

Pinedo, Aldeir, and Fernando Anaya. "ESTUDIO DE LA DECOLORACIÓN DEL COLORANTE SUNFIX YELLOW S4GL EMPLEANDO EL PROCESO DE OXIDACIÓN AVANZADA H2O2/UV." Revista Cientifica TECNIA 27, no. 1 (2018): 67. http://dx.doi.org/10.21754/tecnia.v27i1.127.

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Se ha realizado el estudio cinético de la decoloración del colorante reactivo Sunfix Yellow S4GL (RAS) empleando una disolución de 20 ppm del colorante mediante el proceso de oxidación avanzada (POA) H2O2/UV. Para ello se evaluó el efecto de la concentración inicial del peróxido de hidrógeno, el pH inicial de la solución, la concentración del colorante y la intensidad de la radiación UV‐C sobre la decoloración con el fin de optimizarlos. Los valores óptimos son los siguientes: concentración inicial de H2O2 a 3.8 x 10‐2 mol/L, pH3, concentración inicial del colorante a 20mg/L, potencia de radiación 3 lámparas con potencia de 15W de radiación UV‐C cada una. El estudio cinético de la decoloración sigue un modelo cinético de pseudo primer orden. Bajo condiciones óptimas se obtuvo un porcentaje de decoloración del 100% luego de una hora de tratamiento. Palabras clave.- decoloración, proceso de oxidación avanzada (POA), peróxido de hidrógeno, radiación UV‐C em> ABSTRACT A study of the kinetics of discoloration of a 20 ppm solution of Sunfix Yellow S4GL (RAS) reactive dye has been carried out using the H2O2/UV advanced oxidation process (AOP). To optimize the process, the effects on the discoloration of the initial concentration of hydrogen peroxide, the initial pH of the solution, the dye concentration and the intensity of the UV‐ C radiation were evaluated. The optimum values were the following: initial concentration of H2O2 a 3.8 x 10‐2 mol/L, pH3; initial dye concentration: 20 mg/L; UV radiation: 3 bulbs with 15 W of UV‐C power each. The discoloration reaction followed a pseudo first order kinetic model. Under optimum conditions, a one hour treatment yielded 100% discoloration. Keywords.- discoloration, advanced oxidation process (AOP), hydrogen peroxide, UV‐C radiation.
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Cardoso, Inês M. F., Rita M. F. Cardoso, Luís Pinto da Silva, and Joaquim C. G. Esteves da Silva. "UV-Based Advanced Oxidation Processes of Remazol Brilliant Blue R Dye Catalyzed by Carbon Dots." Nanomaterials 12, no. 12 (2022): 2116. http://dx.doi.org/10.3390/nano12122116.

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UV-based advanced oxidation processes (AOPs) (UV/H2O2 and UV/S2O82−) with a titanium(IV)-doped carbon dot, TiP-CD, as a catalyst were developed for the decomposition of Remazol Brilliant Blue R (Reactive Blue 19), an anthraquinone textile dye (at T = 25 °C and pH = 7). The Ti-CD, with marked catalytic UV properties, was successfully synthesized by the one-pot hydrothermal procedure, using L-cysteine as carbon precursor, ethylenediamine as nitrogen source, PEG (polyethylene glycol) as a capping agent, and titanium(IV) isopropoxide (precursor of TiO2 doping). Contrary to azo dyes (methyl orange, orange II sodium salt, and reactive black 5), which achieved complete degradation in a time interval less than 30 min in the developed AOP systems (UV/H2O2, UV/S2O82−, and UV/TiO2), the RBB-R showed relatively low degradation rates and low discoloration rate constants. In the presence of the catalyzer, the reaction rate significantly increased, and the pseudo-first-order rate constants for the RBB-R discoloration were UV/3.0 mM H2O2/TIP-CD-0.0330 min−1 and UV/1.02 mM S2O82−/TIP-CD-0.0345 min−1.
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28

Jamil, Aneela, Tanveer Hussain Bokhari, Munawar Iqbal, Muhammad Zuber, and Iftikhar Hussain Bukhari. "ZnO/UV/H2O2 Based Advanced Oxidation of Disperse Red Dye." Zeitschrift für Physikalische Chemie 234, no. 1 (2020): 129–43. http://dx.doi.org/10.1515/zpch-2019-0006.

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AbstractIn view of promising efficiency of advanced oxidation process, ZnO/UV/H2O2 based advanced oxidation process (AOP) was employed for the degradation of Disperse Red-60 (DR-60) in aqueous medium. The process variables such as concentration of catalysts, reaction time, pH, dye initial concentration and H2O2 dose were evaluated for maximum degradation of dye. The maximum degradation of 97% was achieved at optimum conditions of H2O2 (0.9 mL/L), ZnO (0.6 g/L) at pH 9.0 in 60 min irradiation time. The analysis of treated dye solution revealed the complete degradation under the effect of ZnO/UV/H2O2 treatment. The water quality parameters were also studied of treated and un-treated dye solution and up to 79% COD and 60% BOD reductions were achieved when dye was treated with at optimum conditions. The dissolved oxygen increased up to 85.6% after UV/H2O2/ZnO treatment. The toxicity was also monitored using hemolytic and Ames tests and results revealed that toxicity (cytotoxicity and mutagenicity) was also reduced significantly. In view of promising efficiency of UV/H2O2/ZnO system, it could possibly be used for the treatment of wastewater containing toxic dyes.
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29

Fraga, Karina Rodrigues de, Tais Port Hartz, and Carla Weber Scheeren. "Photodegradation and kinetics studies of food dyes by advanced oxidative processes." OBSERVATÓRIO DE LA ECONOMÍA LATINOAMERICANA 22, no. 9 (2024): e6623. http://dx.doi.org/10.55905/oelv22n9-067.

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In this research, the advanced oxidative processe (AOP), Photo-Fenton was applied and kinetics studies were realized by the photodegradation of bright blue FCF, ponceau 4R red and tartrazine yellow food dyes. The AOP Photo-Fenton (combining iron/hydrogen peroxide (H2O2, 36% v/v) /ultraviolet (UV) light, processes were studied. The reaction time, concentration and time of exposure to UV light were evaluated for the food dyes described with both AOP. The results exhibited good effectiveness by Photo-Fenton in the photodegradation of bright blue FCF, ponceau 4R red and tartrazine yellow food dyes. The Photo-Fenton (Fe/H2O2/UV light) exposed high photodegradation in shorter reaction time for all food dyes studied. The kinetics studies performed from the photodegradation food dyes data, showed exponential behavior of the concentration as a function of time, given the first-order exponential with good correlation coefficient, R2 = 0,99 for bright blue FCF, ponceau 4R red and tartrazine yellow food dyes. Thus, we can highlight that the Photo-Fenton stand out as an important methodology for treating industrial effluents containing food dyes, combining the advantages of ease, effectiveness and low cost in the process.
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30

Luiz, D. B., A. K. Genena, H. J. José, R. F. P. M. Moreira, and H. Fr Schröder. "Tertiary treatment of slaughterhouse effluent: degradation kinetics applying UV radiation or H2O2/UV." Water Science and Technology 60, no. 7 (2009): 1869–74. http://dx.doi.org/10.2166/wst.2009.583.

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In some Brazilian regions, surface water has become scarce, e.g. semi arid climate areas and densely populated and industrial areas, where water over-exploitation and/or fluvial pollution has been more common. Advanced oxidative processes (AOP) provide treated water as a source of reuse water even with the characteristics of drinking water enabling water reuse practices also in food industries. The secondary wastewater of a slaughterhouse was the water source for a tertiary treatment study evaluating the kinetics of the photo-induced degradation of color and UV254 under UV radiation with and without the addition of H2O2. The proximity of the k′ values of color and UV254 degradation by UV indicates that the compounds responsible for color may be the same content measured by UV254. The H2O2/UV treatment was 5.2 times faster than simple UV in removing aromatic compounds. The degradation kinetics of aromatic compounds in both treatments followed a pseudo-first order law. The pseudo-first order constant for H2O2/UV and UV treatments were kUV254′=0.0306 min−1 and kUV254′=0.0056 min−1, respectively.
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31

Wiguna, I. Made Candra, Ni Wayan Yuningrat, and I. Made Gunamantha. "PENURUNAN KEKERUHAN, KADAR LAS DAN FOSFAT LIMBAH CUCIAN RUMAH TANGGA DENGAN METODE KOMBINASI PENGOLAHAN KOAGULASI DAN PROSES OKSIDASI LANJUT SISTEM UV/H2O2." International Journal of Applied Chemistry Research 2, no. 2 (2020): 46. http://dx.doi.org/10.23887/ijacr.v2i2.28980.

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Peneliatian ini adalah penelitian eksperimen yang bertujuan untuk menganalisis kekeruhan, kadar LAS (Linier Alkyl Sulfonate) dan fosfat pada limbah cucian rumah tangga di salah satu pemukiman padat penduduk di kawasan Kota Singaraja sesuai Keputusan Menteri Negara Lingkungan Hidup KEP 51/MENLH/10/1995. Subjek penelitian ini adalah limbah cucian rumah tangga di salah satu pemukiman padat penduduk di kawasan Kota Singaraja, sedangkan objek dari penelitian ini adalah kekeruhan, kadar LAS (Linier Alkyl Sulfonate) dan fosfat. Penelitian ini menggunakan metode koagulasi dengan koagulan FeCl3. Metode koagulasi ini untuk menentukan pH dan konsentrasi optimum FeCl3 dikombinasikan dengan proses AOP sistem UV/H2O2 untuk menurunkan kekeruhan, kadar LAS dan fosfat pada limbah cucian rumah tangga. Sebelum percobaan dilakukan, kekeruhan, kadar LAS dan fosfat ditentukan terlebih dahulu nilai kekeruhan awal limbah cucian rumah tangga tersebut sebelum diberikan perlakuan yaitu 164 NTU, kadar LAS awal tanpa perlakuan yaitu 2,659 mg/L, dan kadar fosfatt awal tanpa perlakuan 0,988 mg/L. Kondisi optimum pada proses koagulasi untuk pengolahan limbah cucian rumah tangga dengan penambahan 25 mL koagulan FeCl3 2% pada pH 4. Efisiensi penurunan kekeruhan LAS dan fosfat berturut-turut pada kondisi tersebut adalah 90,7%, 72,9% dan 89,2%.Efisiensi penurunan kekeruhan, kadar LAS dan fosfat dari proses dengan Proses AOP Sistem UV/H2O2 berturut-turut adalah 72,5% , 93,3% dan 96,2% Efisiensi penurunan nilai kekeruhan, kadar LAS dan fosfat dari kombinasi proses koagulasi dan AOP sistem UV/H2O2 berturut-turut sebesar 97,4%, 98,1% dan 99,5%.
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Bijoli, Mondal, Adak Asok, and Datta Pallab. "Degradation of CTAB by UV/H2O2 AOP – Optimization of process parameters." Journal of Indian Chemical Society Vol. 97, Apr 2020 (2020): 613–19. https://doi.org/10.5281/zenodo.5643406.

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Department of Civil Engineering, Haldia Institute of Technology, Haldia-721 657, Purba Medinipur, West Bengal, India Department of Civil Engineering, Center for Healthcare Science and Technology, Indian Institute of Engineering Science and Techonology, Shibpur, Howrah-711 103, West Bengal, India <em>E-mail</em>: bijolimondal15@gmail.com, asok@civil.iiests.ac.in, contactpallab@gmail.com <em>Manuscript received online 22 December 2019, accepted 23 March 2020</em> In the present study, the most popularly statistical tool, response surface methodology (RSM) has been used to optimize the important process parameters such as peroxide dose, initial concentration of cetyltrimethyl ammonium bromide (CTAB), pH and NO<sub>3</sub> <sup>&ndash;</sup> concentration for degradation of CTAB from wastewater by UV/H<sub>2</sub>O<sub>2</sub> advanced oxidation process (AOP). Experimental design and optimization of the degradation process were done by central composite design (CCD). Results revealed that increase in CTAB concentration and nitrate concentrations adversely affect the CS degradation. On the other hand, higher H<sub>2</sub>O<sub>2 </sub>concentration and pH showed an increase in fluence-based rate constant upto a maximum followed by decrease in degradation rate upon further increase in concentration of each factor. The maximum fluence-based rate constant (0.0044 cm<sup>2</sup> mJ<sup>&ndash;1</sup>) for degradation of CTAB was obtained at optimized conditions of 100 mg L<sup>&ndash;1</sup> of CTAB, 0.25 mM of nitrate concentration of NO<sub>3</sub> <sup>&ndash;</sup> and 1 mol H<sub>2</sub>O<sub>2</sub> per mol of CTAB at the solution pH of 7.
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33

Mounteer, A. H., T. A. Leite, A. C. Lopes, and R. C. Medeiros. "Removing textile mill effluent recalcitrant COD and toxicity using the H2O2/UV system." Water Science and Technology 60, no. 7 (2009): 1895–902. http://dx.doi.org/10.2166/wst.2009.584.

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The potential of the H2O2/UV process for improving quality of an industrial textile effluent before biological treatment was evaluated in the laboratory using a multivariate experimental design to determine the effects of pH, H2O2 dose and reaction time on colour, COD and toxicity removal efficiencies. Increasing reaction time (from 10 to 120 min) and H2O2 dose (from 0 to 5 mmol L−1) significantly improved removal efficiencies, while increasing pH (from 4 to 10) had a negative effect on colour and toxicity removals. Laboratory H2O2/UV treatment of the mill effluent under optimum conditions (pH 7, 5 mmol L−1 H2O2, 120 min) resulted in decreases in colour (70%), COD (21%) and toxicity (67%), without lowering BOD. H2O2 was consumed within the first 30–60 min, while the effluent average oxidation state stabilized after 60 min. Decreasing reaction time to 60 min resulted in similar colour (63%) and COD (20%) removals but lower toxicity removal (44%). Spectrophotometric monitoring of the optimized reaction indicated partial destruction of residual aromatic azo dyes. H2O2 and residual peroxide and average oxidation state of the effluent Effluent biodegradability (BOD/COD) increased by 28% after the H2O2/UV treatment. Improvements observed in effluent quality are expected to enhance combined AOP-biological treatment efficiency of the mill effluent.
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Lakretz, Anat, Hadas Mamane, Eli Asa, Tali Harif, and Moshe Herzberg. "Biofouling control by UV/H2O2 pretreatment for brackish water reverse osmosis process." Environmental Science: Water Research & Technology 4, no. 9 (2018): 1331–44. http://dx.doi.org/10.1039/c8ew00183a.

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UV applied with H<sub>2</sub>O<sub>2</sub> is a well-known advanced oxidation process (AOP) for degradation of trace organic compounds. In this study, the UV/H<sub>2</sub>O<sub>2</sub> process was applied as a pre-treatment step to control reverse osmosis biofouling.
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35

Park, Jong-Il, Young Lee, Kyoung-A. Jang, Keon-Hoi Kim, Tae-Hoon Lee, and Sun-Wook Kim. "A Study on the Comparative Analysis of 2-MIB Treatment Characteristics and Optimization of Process Operation in 2-types of Advanced Water Treatment Plants in the Han River Water Supply System." Journal of Korean Society of Environmental Engineers 42, no. 12 (2020): 674–89. http://dx.doi.org/10.4491/ksee.2020.42.12.674.

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Objectives:In this study, through the results of the high-concentration 2-MIB (2-Methyl Isoborneol) treatment by two different types of advanced treatment plants (Post Peroxone+GAC, UV/H2O2+GAC F/A) which intake raw water from the same water intake facility, the 2-MIB removal characteristics by oxidation process of each WTPs (Water Treatment Plants) were compared and analyzed, and optimal operation methods were derived.Methods:The 2-MIB removal rate was compared and analyzed according to each AOP (Advanced Oxidation Process) operating conditions (Post Peroxone+GAC of the G WTP and UV/H2O2+GAC F/A of the I WTP). The optimal equations of chemical injection were derived through the correlation between the operating conditions of the AOP for each WTPs and 2-MIB removal rate. By analyzing the operating characteristics of each WTPs, the cost and unit price for optimal operation were calculated according to the 2-MIB concentration of raw water and water production. Optimal operating conditions were derived through the performance of oxidation facilities and chemical injection equations of each WTPs, and economical operating plans were reviewed through linked operation of 2 WTPs.Results and Discussion:The 2-MIB removal rates for each WTPs were 70~100% for the G WTP and 50~96% for the I WTP. The operating conditions affecting the 2-MIB removal were [O3 injection×contact time], H2O2/O3 for Post Peroxone of the G WTP, and [UV dose×H2O2 injection] for UV/H2O2 of the I WTP. As a result of comparing the operating cost(electric power cost + chemical cost) of each WTPs, I WTP was 6.6~24.3 KRW/m3 higher than G WTP. It is considered to be because the H2O2 injection was 11~43 times for UV/H2O2 than Post Peroxone. Optimal operating conditions could be derived through the performance evaluation of each oxidation facilities and chemical injection equations of each WTPs. The G WTP and the I WTP are equipped with pipe line for linked operation in the water supply pipes, so the water production for each WTPs can be distributed. In the case of the same water production, it was confirmed that the unit price can be reduced when the water production ratio of the G WTP is increased. Because the decrease in cost of the I WTP is higher than the increase in cost of the G WTP.Conclusions:It was confirmed that both Post Peroxone+GAC of G WTP and UV/H2O2+GAC F/A of I WTP were effective in 2-MIB treatment. As for the operating cost, it was analyzed that UV/H2O2 had higher unit pice than Post Peroxone because of the large amount of H2O2 injection. Considering the 2-MIB removal rate and operating cost of each WTPs, it was possible to derive the optimal operating conditions for each WTPs and a linked operation plan.
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Pratiwi, Niken Tunjung Murti, Muhammad Irfan Afif, and Sigid Hariyadi. "Chelation and AOP Approach on Mn-Metal and COD Reduction of Liquid Laboratory Waste." Journal of Hunan University Natural Sciences 49, no. 5 (2022): 41–47. http://dx.doi.org/10.55463/issn.1674-2974.49.5.5.

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Heavy metal waste and organic material used in flushing laboratory glassware can accumulate and potentially damage the environment. Thus, it needs to be processed before being disposed of to avoid any damage to the aquatic ecosystem. This research aimed to determine the pH wastewater sample and APDC concentration as chelating agents that would be the best for chelation treatment and determine the H2O2 concentration and UV exposure duration to identify the best treatment for the advanced oxidation process. This research was expected to find an alternative in wastewater treatment and provide an overview of the interaction of chelation treatment with organic pollutants as the basis for AOP-treatment management. Laboratory wastewater quality has improved through the extraction treatment of chelate from the pH 4 experiment, ammonium pyrrolidine dithiocarbamate (APDC) concentration at 7.5% with the manganese metal value decreased by 53%, an advanced oxidation process (AOP) treatment of H2O2 concentration at a 5.10-5%, and 31-hour UV exposure, resulting in chemical oxygen demand (COD) decreased by 98.98%. Waste containing both materials was reduced by combining the extraction of chelate formation and AOP, which was detected from the presence of manganese metal and the COD. This treatment can be an appropriate and easy way to degrade laboratory waste in a mini wastewater treatment process. This research succeeded in finding several novelties: first, a suitable pH value to reactivate Mn metal for chelation with APDC; second, the concentration of APDC determined to optimize the Mn metal chelate; third, the concentration of H2O2 to increase the effectiveness of organic matter reduction; fourth, the duration of UV irradiation is effective and efficient as a photocatalyst to reduce organic matter.
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Suty, H., C. De Traversay, and M. Cost. "Applications of advanced oxidation processes: present and future." Water Science and Technology 49, no. 4 (2004): 227–33. http://dx.doi.org/10.2166/wst.2004.0270.

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The use of advanced oxidation processes (AOPs) to remove pollutants in various water treatment applications has been the subject of study for around 30 years. Most of the available processes (Fenton reagent, O3 under basic conditions, O3/H2O2, O3/UV, O3/solid catalyst, H2O2/Mn+, H2O2/UV, photo-assisted Fenton, H2O2/solid catalyst, H2O2/NaClO, TiO2/UV etc.) have been investigated in depth and a considerable body of knowledge has been built up about the reactivity of many pollutants. Various industrial applications have been developed, including ones for ground remediation (TCE, PCE), the removal of pesticides from drinking water, the removal of formaldehyde and phenol from industrial waste water and a reduction in COD from industrial waste water. The development of such AOP applications has been stimulated by increasingly stringent regulations, the pollution of water resources through agricultural and industrial activities and the requirement that industry meet effluent discharge standards. Nevertheless, it is difficult to obtain an accurate picture of the use of AOPs and its exact position in the range of water treatment processes has not been determined to date. The purpose of this overview is to discuss those processes and provide an indication of future trends.
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38

Sörensen, Martin, and Fritz H. Frimmel. "Photodegradation of EDTA and NTA in the UV / H2O2 Process." Zeitschrift für Naturforschung B 50, no. 12 (1995): 1845–53. http://dx.doi.org/10.1515/znb-1995-1211.

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The influence of H2O2 on the UV degradation of the broadly used aminopolycarboxylates EDTA and NTA in aqueous solution was investigated. The photochemical degradation in the UV /H2O2 process was compared with classical oxidative treatment of potable water. The German drinking water regulation (Trinkwasserverordnung) was the orientation for all experiments. The Advanced Oxidation Process (AOP) turned out to be superior to the classical oxidation processes. The photochemical degradation of EDTA and NTA by UV irradiation could be significantly stimulated in the presence of H2O2. There was a strong increase in the degradation rate and a decrease in the quantum yield of the aminopolycarboxylates. Experiments with butyl chloride as radical scavenger proved the photolytically generated hydroxyl radicals to be responsible for the increase in the degradation rates.The effect of increasing the degradation rate at higher concentrations of H2O2 was limited, because the steady-state concentrations of the hydroxyl radicals as reactive species, did not increase at the same rate as the initial concentration of H2O2.Low amounts of iron dissolved from the high-grade steel photoreactor walls had a significant catalytic effect on the degradation.
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39

Luu, Huyen Trang, and Kisay Lee. "Degradation and changes in toxicity and biodegradability of tetracycline during ozone/ultraviolet-based advanced oxidation." Water Science and Technology 70, no. 7 (2014): 1229–35. http://dx.doi.org/10.2166/wst.2014.350.

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Advanced oxidation processes (AOPs) composed of O3, H2O2 and ultraviolet (UV) were applied to degrade tetracycline (TC). Degradation efficiency was evaluated in terms of changes in absorbance (ABS) and total organic carbon (TOC). The change in biotoxicity was monitored with Escherichia coli and Vibrio fischeri. The improvement in biodegradability during oxidation was demonstrated through 5-day biochemical oxygen demand/chemical oxygen demand ratio and aerobic biological treatment. The combination of O3/H2O2/UV and O3/UV showed the best performance for the reductions in ABS and TOC. However, mineralization and detoxification were not perfect under the experimental conditions that were used in this study. Therefore, for the ultimate treatment of TC compounds, it is suggested that AOP treatment is followed by biological treatment, utilizing enhanced biodegradability. In this study, aerobic biological treatment by Pseudomonas putida was performed for O3/UV-treated TC. It was confirmed that O3/UV treatment improved TOC reduction and facilitated complete mineralization in biological treatment.
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40

Evgenidou, Eleni, Konstantina Vasilopoulou, Lelouda-Athanasia Koronaiou, George Kyzas, Dimitrios Bikiaris, and Dimitra Lambropoulou. "AOP-Based Transformation of Abacavir in Different Environments: Evolution Profile of Descyclopropyl-Abacavir and In Silico Toxicity Assessment of the Main Transformation Products." Molecules 28, no. 4 (2023): 1866. http://dx.doi.org/10.3390/molecules28041866.

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This study explores the photocatalytic transformation of the antiviral drug abacavir employing different advanced oxidation processes (AOPs) such as UV/TiO2, UV/MOF/H2O2, UV/MOF/S2O82−, UV/Fe2+/H2O2, and UV/Fe2+/S2O82−. All processes appear to be effective in eliminating abacavir within a few minutes, while the evolution profile of the basic transformation product, descyclopropyl-abacavir (TP-247) was also monitored. Moreover, the implementation of the most efficient technologies towards the removal of abacavir in different matrices such as wastewater effluent and leachate was also assessed, revealing that the organic matter present or the inorganic constituents can retard the whole process. Four major transformation products were detected, and their time-evolution profiles were recorded in all studied matrices, revealing that different transformation pathways dominate in each matrix. Finally, the prediction of the toxicity of the major TPs employing ECOSAR software was conducted and showed that only hydroxylation can play a detoxification role in the treated solution.
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41

Bule Možar, Kristina, Martina Miloloža, Viktorija Martinjak, et al. "The Potential of AOP Pretreatment in the Biodegradation of PS and PVC Microplastics by Candida parapsilosis." Water 16, no. 10 (2024): 1389. http://dx.doi.org/10.3390/w16101389.

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Microplastics are an emerging class of recalcitrant organic pollutants that are of general scientific and public interest nowadays. It would be ideal to remove microplastics from the environment through biodegradation, as biodegradation is a highly ecological and economically acceptable approach. Unfortunately, the efficiency of biodegradation of conventional plastic polymers is low. The application of a suitable pretreatment could increase the efficiency of biodegradation. In this study, the applicability of UV-C/H2O2 and UV-C/S2O82− advanced oxidation processes as pretreatments for the biodegradation of polystyrene and poly(vinyl chloride) microplastics by the yeast Candida parapsilosis was investigated. For the investigated range (pH 4–10, peroxide concentration up to 20 mM and treatment duration up to 90 min), the UV-C/H2O2 process proved to be more effective in degrading polystyrene microplastics, while the UV-C/S2O82− process was more efficient at degrading poly(vinyl chloride) microplastics. Samples pretreated under optimal conditions (90 min treatment time at a pH of 5.7 and H2O2 concentration of 20.0 mM for polystyrene samples; 90 min treatment time at a pH of 8.6 and S2O82− concentration of 11.1 mM for poly(vinyl chloride) samples) were subjected to biodegradation by Candida parapsilosis. The biodegradation conditions included an agitation speed of 156 rpm and an initial pH of 5.7 for the experiments with the polystyrene samples, while an agitation speed of 136 rpm and an initial pH of 4.9 were used for the poly(vinyl chloride) experiments. The initial value of the optical density of the yeast suspension was 1.0 in both cases. The experiments showed a positive effect of the pretreatment on the number of yeast cells on the surface of the microplastics.
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42

Srivastav, Manjari, Meenal Gupta, Sushil K. Agrahari, and Pawan Detwal. "Removal of Refractory Organic Compounds from Wastewater by Various Advanced Oxidation Process - A Review." Current Environmental Engineering 6, no. 1 (2019): 8–16. http://dx.doi.org/10.2174/2212717806666181212125216.

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Per capita average annual freshwater availability is gradually reduced due to increasing population, urbanization and affluent lifestyles. Hence, management of wastewater is of great concern. The wastewater from different industries can be treated by various conventional treatment methods but these conventional treatment technologies seem to be ineffective for the complete removal of pollutants especially refractory organic compounds that are not readily biodegradable in nature. Detergents, detergent additives, sequestering agents like EDTA, Pesticides, Polycyclic aromatic hydrocarbons, etc. are some of the recalcitrant organic compounds found in the wastewater. One of the treatment technologies for the removal of recalcitrant organic compounds is Advanced Oxidation Process (AOP). The production of hydroxyl free radical is the main mechanism for the AOP. AOP is a promising technology for the treatment of refractory organic compounds due to its low oxidation selectivity and high reactivity of the radical. Hydrogen peroxide (H2O2), Ozonation, Ultra-violet (UV) radiation, H2O2/UV process and Fenton’s reaction are extensively used for the removal of refractory organic compounds thus reducing Chemical Oxygen Demand (COD), Total Organic Carbon (TOC), phenolic compounds, dyes etc. to great extent. From the studies, we found that Fenton’s reagents appear to be most economically practical AOP systems for almost all industries with respect to high pollutant removal efficiency and it is also economical. From the energy point of view, the ozone based process proves to be more efficient but it is costlier than the Fenton’s process.
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43

Núñez-Tafalla, Paula, Irene Salmerón, Silvia Venditti, and Joachim Hansen. "Assessing the Synergies of Photo-Fenton at Natural pH and Granular Activated Carbon as a Quaternary Treatment." Water 16, no. 19 (2024): 2824. http://dx.doi.org/10.3390/w16192824.

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The challenge of microcontaminants (MCs) in wastewater effluent has been addressed by using different technologies, including advanced oxidation processes (AOPs) and adsorption. This work evaluates the benefits and synergies of combining these two processes. The AOPs were photo-Fenton and UV/H2O2 operated under natural pH but with different reagents dosages, lamps, and chelating agents. Chelating agents were used at analytical (ethylenediamine-N,N-disuccinic acid and citric acid) and technical grade (citric acid) to simulate scaling-up conditions. The adsorption process was studied via granular activated carbon (GAC) filtration using fresh and regenerated GAC. Four AOP scenarios were selected and coupled with GAC filtration, showing benefits for both processes. AOP treatment time decreased from 10–15 min to 5 min, resulting in a reduction in energy consumption of between 50 and 66%. In the photo-Fenton process, it was possible to work with low reagent dosages (1.5 mg L−1 iron and 20 mg L−1 of H2O2). However, the use of UV/H2O2 showed close removal, highlighting it as a real alternative. An extension of the GAC lifetime by up to 11 times was obtained in all the scenarios, being higher for regenerated than for fresh GAC. Furthermore, the toxicity and phytotoxicity of the treated wastewater were evaluated, and no acute toxicity or slight variation in the phytotoxicity was observed in the combination of these processes.
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44

Napoleão, Daniella Carla, Tássia Santos Gonçalves, Naiana Santos da Cruz Santana Neves, et al. "Association of advanced oxidative and adsorptive processes for dye treatment in the sanitizer industry: kinetic, equilibrium and toxicity evaluation." Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental 26 (January 17, 2023): e10. http://dx.doi.org/10.5902/2236117066989.

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The presence of dyes in wastewater can cause several damages to the environment. Aiming at its removal, advanced oxidative processes (AOP) and adsorption (ADS) have been used. In this work, the removal of acid blue dye 80 (AA80) by AOP (photoperoxidation (PP) and photo-Fenton (PF)) and by ADS was evaluated, individually and combined. The use of the PP/UV-C system led to degradations of 72.7 and 83.8% for the λ of 334 and 622 nm, respectively. The PP/LED system did not degrade. For the PF process, &gt; 90% degradation was obtained for both radiations. The [Fe] (1 mg.L-1) and [H2O2] (90 mg.L-1)were optimized for the PF/LED system. As for the PF/UV-C system, the optimal [H2O2] was 60 mg.L-1. The experimental data fit well with the Chan and Chu (2003) kinetic model with R2&gt;0.94. The kinetic data showed a better fit to the pseudo-second order model (R2&gt;0.90), while equilibrium was reached in 30 min with removal of 62.45 (λ=334 nm) and 83.22% (λ=622 nm), being well represented by the Langmuir and Sips models. Finally, the combined study promoted a 7% increase in AA80 removal, achieving an improvement in the final toxicity of the treated matrix when compared to isolated AOP systems.
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45

Cedillo-Herrera, Cinthia I. G., Adriana Roé-Sosa, Aurora M. Pat-Espadas, Karina Ramírez, Jaime Rochín-Medina, and Leonel E. Amabilis-Sosa. "Efficient Malathion Removal in Constructed Wetlands Coupled to UV/H2O2 Pretreatment." Applied Sciences 10, no. 15 (2020): 5306. http://dx.doi.org/10.3390/app10155306.

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Intensive agriculture has led to the increasing application of pesticides, such as malathion, thus generating large volumes of untreated cropland wastewater (CropWW). In this work, a hybrid system constructed wetlands (CW) coupled in continuous with an optimized UV/H2O2 pretreatment was evaluated for the efficient removal of malathion contained in CropWW. In the first stage, 90 min UV irradiation time (UV IR) and 65 mM hydrogen peroxide (H2O2) were identified as optimal operation parameters through a central composite design. The second stage consisted of CW planted with Phragmites australis collected from the agricultural discharge area and operated as a piston flow reactor. Furthermore, CW hydraulic residence times (HRT) of 1, 2 and 3 days, including hydraulic coupling, were evaluated. The removal efficiencies obtained in the first stage (UV/H2O2) were 94 ± 2.5% of malathion and 45 ± 2.5% of total organic carbon (TOC). In stage two (CW) 65 ± 9.6% TOC removal was achieved during the first 17 days, from which around 24% was associated to the biosorption of malathion byproducts. Subsequently, and until the operation ends, CW removed about 80% of TOC for 2 and 3 days HRT, with no significant differences (p &gt; 0.2), which is higher than those reported in several studies involving only advanced oxidation processes (AOP) with UV IR times above 240 min and even for systems using catalysts. The results obtained indicate that the system UV/H2O2-CW is a technically suitable option for the treatment of CropWW with a high content of malathion mainly found in developing countries. Moreover, the hybrid system proposed also represent significant reduction in the size of the treatment plant.
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46

Kozak, Jolanta, and Maria Włodarczyk-Makuła. "FOTODEGRADATION OF LOW MASS MOLECULE PAHS IN FENTON PROCESS." Zeszyty Naukowe Uniwersytetu Zielonogórskiego / Inżynieria Środowiska 168, no. 48 (2017): 25–34. http://dx.doi.org/10.5604/01.3001.0011.5885.

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Nowadays, the attention of many researchers and scientists is focused on wastewater treatment technologies which are designed to remove toxic and/or persistant compounds. PAHs belong to this type of compounds. Studies have shown that advanced oxidation processes (AOP-advanced oxidation processes) can be used for PAHs degradation. One of the AOP methods is oxidation using Fenton's reagent (Fe2 + / H2O2). The aim of this modification is a search for alternative sources of hydroxyl radicals than H2O2 and support that processes by UV light.. The aim of the study was to determine the efficiency of photocatalysis of low molecular weight PAHs in pretreated coking wastewater under Fenton reaction conditions. The source of hydroxyl radicals was calcium peroxide and the process was supported by UV radiation. The oxidation efficiency was assessed on the basis of PAH analyzes in the pre-and post-oxidation samples. Qualitative and quantitative identification of PAHs was carried out using gas chromatography in combination with GC-MS mass spectrometry. The decrease in the concentration of the analyzed carbohydrates was in the range of 17 to 96%. Studies have shown that calcium peroxide can be an alternative source of hydroxyl radicals for the PAH degradation present in coke wastwater.
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47

Munawar, Iqbal, Z. Ahmad Muhammad, A. Bhatti Ijaz, Qureshi Khizar, and Khan Aamera. "Cytotoxicity reduction of wastewater treated by advanced oxidation process." Chemistry International 1, no. 1 (2015): 53–59. https://doi.org/10.5281/zenodo.1469792.

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The degradation of printing dyes from textile printing industry effluents was carried out by Advanced Oxidation Process (AOP) in which heterogeneous photocatalytic treatment of textile printing wastewater using UV/H2O2/TiO2 system was studied. For the treatment of textile effluents different concentration of titanium dioxide (TiO2) and effect of application time of UV radiation was investigated. The degradation of treated wastewater was estimated spectrophotometrically. To check the extent of mineralization and decolorization after treatment water quality parameter such as percentage degradation, COD, BOD, TOC, pH, DO and toxicity were studied. Before treatment the values of water quality parameters were as; COD (1950 mg/L), BOD (963 mg/L), TOC (3410 mg/L), pH (9.6) and DO (1.77 mg/L). After application of UV/H2O2/TiO2 degradation was observed to be 72% and reduction in COD, BOD, TOC were 58%, 57%, 48%, and increase in DO level was up to 49% respectively. For the evaluation of the toxicity of photocatalyticaly treated wastewater, Allium cepa and brine shrimp test were also carried out before and after treatment of printing wastewater.
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de Almeida, Maria Carolina, Tatianne Ferreira de Oliveira, and Fernando Pereira de Sá. "Degradation of disrupter regulateur dietilphtalate by (AOP)-UV-C/H2O2 using response surface methodology." DESALINATION AND WATER TREATMENT 120 (2018): 282–88. http://dx.doi.org/10.5004/dwt.2018.22754.

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Wang, Chengjin, Michael Hofmann, Armin Safari, Isabelle Viole, Susan Andrews, and Ron Hofmann. "Chlorine is preferred over bisulfite for H2O2 quenching following UV-AOP drinking water treatment." Water Research 165 (November 2019): 115000. http://dx.doi.org/10.1016/j.watres.2019.115000.

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50

Dwyer, Jason, Lydia Kavanagh, and Paul Lant. "The degradation of dissolved organic nitrogen associated with melanoidin using a UV/H2O2 AOP." Chemosphere 71, no. 9 (2008): 1745–53. http://dx.doi.org/10.1016/j.chemosphere.2007.11.027.

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