Journal articles: 'Advanced oxidation processes (AOP)'

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Hoislbauer, C., W. Gangl, J. Zelenka, M. Siebenhofer, and R. Marr. "Advanced Oxidation Processes (AOP/EAOP)." Chemie Ingenieur Technik 79, no. 9 (September 2007): 1487. http://dx.doi.org/10.1002/cite.200750374.

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Andreozzi, R. "Advanced oxidation processes (AOP) for water purification and recovery." Catalysis Today 53, no. 1 (October 15, 1999): 51–59. http://dx.doi.org/10.1016/s0920-5861(99)00102-9.

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Rapf, M., and E. Thomanetz. "Advanced Oxidation Processes (AOP) zur Vorbehandlung organisch hochbelasteter Prozessabwässer." Chemie Ingenieur Technik 90, no. 9 (August 24, 2018): 1190. http://dx.doi.org/10.1002/cite.201855129.

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Wang, Jenny, Achim Ried, Harald Stapel, Yaning Zhang, Minghui Chen, Wui Seng Ang, Rongjing Xie, Ankur Duarah, Lifeng Zhang, and Mong Hoo Lim. "A pilot-scale investigation of ozonation and advanced oxidation processes at Choa Chu Kang Waterworks." Water Practice and Technology 10, no. 1 (March 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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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 (November 14, 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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TOCK, RICHARD W., MAHESH A. REGE, and SANJAY H. BHOJANI. "Simultaneous Evaporation and Advanced Oxidation Processes (AOP) for Process Water Treatment." Hazardous Waste and Hazardous Materials 10, no. 2 (January 1993): 195–208. http://dx.doi.org/10.1089/hwm.1993.10.195.

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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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Elmobarak, Wamda Faisal, Bassim H. Hameed, Fares Almomani, and Ahmad Zuhairi Abdullah. "A Review on the Treatment of Petroleum Refinery Wastewater Using Advanced Oxidation Processes." Catalysts 11, no. 7 (June 27, 2021): 782. http://dx.doi.org/10.3390/catal11070782.

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The petroleum industry is one of the most rapidly developing industries and is projected to grow faster in the coming years. The recent environmental activities and global requirements for cleaner methods are pushing the petroleum refining industries for the use of green techniques and industrial wastewater treatment. Petroleum industry wastewater contains a broad diversity of contaminants such as petroleum hydrocarbons, oil and grease, phenol, ammonia, sulfides, and other organic composites, etc. All of these compounds within discharged water from the petroleum industry exist in an extremely complicated form, which is unsafe for the environment. Conventional treatment systems treating refinery wastewater have shown major drawbacks including low efficiency, high capital and operating cost, and sensitivity to low biodegradability and toxicity. The advanced oxidation process (AOP) method is one of the methods applied for petroleum refinery wastewater treatment. The objective of this work is to review the current application of AOP technologies in the treatment of petroleum industry wastewater. The petroleum wastewater treatment using AOP methods includes Fenton and photo-Fenton, H2O2/UV, photocatalysis, ozonation, and biological processes. This review reports that the treatment efficiencies strongly depend on the chosen AOP type, the physical and chemical properties of target contaminants, and the operating conditions. It is reported that other mechanisms, as well as hydroxyl radical oxidation, might occur throughout the AOP treatment and donate to the decrease in target contaminants. Mainly, the recent advances in the AOP treatment of petroleum wastewater are discussed. Moreover, the review identifies scientific literature on knowledge gaps, and future research ways are provided to assess the effects of these technologies in the treatment of petroleum wastewater.

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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 (February 1, 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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Carey, J. H. "An Introduction to Advanced Oxidation Processes (AOP) for Destruction of Organics in Wastewater." Water Quality Research Journal 27, no. 1 (February 1, 1992): 1–22. http://dx.doi.org/10.2166/wqrj.1992.001.

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Abstract Various processes that have been suggested for the oxidation of organic compounds in wastewater are summarized. The most widely applicable are based on generation of hydroxyl radicals via the photolysis of hydrogen peroxide, ozone and titanium dioxide. Other methods of generating hydroxyl radicals and other oxidants, as well as other methods of oxidation that have been suggested for organic wastewater treatment are also discussed.

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Liu, Gaoyuan, Haibao Huang, Ruijie Xie, Qiuyu Feng, Ruimei Fang, Yajie Shu, Yujie Zhan, Xinguo Ye, and Cheng Zhong. "Enhanced degradation of gaseous benzene by a Fenton reaction." RSC Advances 7, no. 1 (2017): 71–76. http://dx.doi.org/10.1039/c6ra26016k.

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A wet scrubbing process coupled with advanced oxidation processes (AOP) has raised great interest for the abatement of volatile organic compounds (VOCs) owing to its strong oxidation capacity and few byproducts.

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Andreozzi, R., L. Campanella, B. Fraysse, J. Garric, A. Gonnella, R. Lo Giudice, R. Marotta, G. Pinto, and A. Pollio. "Effects of advanced oxidation processes (AOPs) on the toxicity of a mixture of pharmaceuticals." Water Science and Technology 50, no. 5 (September 1, 2004): 23–28. http://dx.doi.org/10.2166/wst.2004.0304.

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The possibility of applying main AOP techniques, namely ozonation, H2O2/UV photolysis and TiO2 photocatalysis to provide a significant reduction of toxicity of pharmaceutical mixtures has been evaluated. For the preparation of the mixture six pharmaceuticals were chosen among those found at highest concentrations in Sewage Treatment Plant effluents, namely carbamazepine, clofibric acid, diclofenac, sulfamethoxazole, ofloxacin and propranolol. The blue-green alga Synechococcus leopoliensis and the rotifer Brachyonus calyciflorus were utilised to assess the toxicity of the mixtures after AOP treatments. All the toxicity tests were performed using chronic standardized bioassays. The best results were obtained with ozonation. With this type of treatment a complete removal of mixture toxicity on S. leopolensis was obtained even after the shortest time of application (1 min). The ozonation treatment leads also to removal of all the pharmaceutical mixture toxicity on B. calyciflorus, by applying the oxidizing agent for at least for 2 minutes.

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Lincho, João, João Gomes, and Rui C. Martins. "Paraben Compounds—Part II: An Overview of Advanced Oxidation Processes for Their Degradation." Applied Sciences 11, no. 8 (April 15, 2021): 3556. http://dx.doi.org/10.3390/app11083556.

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Water scarcity represents a problem for billions of people and is expected to get worse in the future. To guarantee people’s water needs, the use of “first-hand water” or the reuse of wastewater must be done. Wastewater treatment and reuse are favorable for this purpose, since first-hand water is scarce and the economic needs for the exploration of this type of water are increasing. In wastewater treatment, it is important to remove contaminants of emerging concern, as well as pathogenic agents. Parabens are used in daily products as preservatives and are detected in different water sources. These compounds are related to different human health problems due to their endocrine-disrupting behavior, as well as several problems in animals. Thus, their removal from water streams is essential to achieve safe reusable water. Advanced Oxidation Processes (AOPs) are considered very promising technologies for wastewater treatment and can be used as alternatives or as complements of the conventional wastewater treatments that are inefficient in the removal of such contaminants. Different AOP technologies such as ozonation, catalytic ozonation, photocatalytic ozonation, Fenton’s, and photocatalysis, among others, have already been used for parabens abatement. This manuscript critically overviews several AOP technologies used in parabens abatement. These treatments were evaluated in terms of ecotoxicological assessment since the resulting by-products of parabens abatement can be more toxic than the parent compounds. The economic aspect was also analyzed to evaluate and compare the considered technologies.

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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 (December 1, 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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Kozak, Jolanta, and Maria Włodarczyk-Makuła. "FOTODEGRADATION OF LOW MASS MOLECULE PAHS IN FENTON PROCESS." Zeszyty Naukowe Uniwersytetu Zielonogórskiego / Inżynieria Środowiska 168, no. 48 (December 29, 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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Duckworth, Kelsey, Michael Spencer, Christopher Bates, Michael E. Miller, Catherine Almquist, Michael Grimaila, Matthew Magnuson, Stuart Willison, Rebecca Phillips, and LeeAnn Racz. "Advanced oxidation degradation kinetics as a function of ultraviolet LED duty cycle." Water Science and Technology 71, no. 9 (March 9, 2015): 1375–81. http://dx.doi.org/10.2166/wst.2015.108.

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Ultraviolet (UV) light emitting diodes (LEDs) may be a viable option as a UV light source for advanced oxidation processes (AOPs) utilizing photocatalysts or oxidizing agents such as hydrogen peroxide. The effect of UV-LED duty cycle, expressed as the percentage of time the LED is powered, was investigated in an AOP with hydrogen peroxide, using methylene blue (MB) to assess contaminant degradation. The UV-LED AOP degraded the MB at all duty cycles. However, adsorption of MB onto the LED emitting surface caused a linear decline in reactor performance over time. With regard to the effect of duty cycle, the observed rate constant of MB degradation, after being adjusted to account for the duty cycle, was greater for 5 and 10% duty cycles than higher duty cycles, providing a value approximately 160% higher at 5% duty cycle than continuous operation. This increase in adjusted rate constant at low duty cycles, as well as contaminant fouling of the LED surface, may impact design and operational considerations for pulsed UV-LED AOP systems.

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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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Oller, I., S. Malato, J. A. Sánchez-Pérez, M. I. Maldonado, W. Gernjak, and L. A. Pérez-Estrada. "Advanced oxidation process–biological system for wastewater containing a recalcitrant pollutant." Water Science and Technology 55, no. 12 (June 1, 2007): 229–35. http://dx.doi.org/10.2166/wst.2007.411.

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Two advanced oxidation processes (AOPs), ozonation and photo-Fenton, combined with a pilot aerobic biological reactor at field scale were employed for the treatment of industrial non-biodegradable saline wastewater (TOC around 200 mg L−1) containing a biorecalcitrant compound, α-methylphenylglycine (MPG), at a concentration of 500 mg L−1. Ozonation experiments were performed in a 50-L reactor with constant inlet ozone of 21.9 g m−3. Solar photo-Fenton tests were carried out in a 75-L pilot plant made up of four compound parabolic collector (CPC) units. The catalyst concentration employed in this system was 20 mg L−1 of Fe2 + and the H2O2 concentration was kept in the range of 200–500 mg L−1. Complete degradation of MPG was attained after 1,020 min of ozone treatment, while only 195 min were required for photo-Fenton. Samples from different stages of both AOPs were taken for Zahn–Wellens biocompatibility tests. Biodegradability enhancement of the industrial saline wastewater was confirmed (>70% biodegradability). Biodegradable compounds generated during the preliminary oxidative processes were biologically mineralised in a 170-L aerobic immobilised biomass reactor (IBR). The global efficiency of both AOP/biological combined systems was 90% removal of an initial TOC of over 500 mg L−1.

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Kaplan, Aviv, Hadas Mamane, Yaal Lester, and Dror Avisar. "Trace Organic Compound Removal from Wastewater Reverse-Osmosis Concentrate by Advanced Oxidation Processes with UV/O3/H2O2." Materials 13, no. 12 (June 19, 2020): 2785. http://dx.doi.org/10.3390/ma13122785.

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Advanced technologies, such as reverse osmosis (RO), allow the reuse of treated wastewater for direct or indirect potable use. However, even highly efficient RO systems produce ~10–15% highly contaminated concentrate as a byproduct. This wastewater RO concentrate (WWROC) is very rich in metal ions, nutrients, and hard-to-degrade trace organic compounds (TOrCs), such as pharmaceuticals, plasticizers, flame retardants, and detergents, which must be treated before disposal. WWROC could be up to 10 times more concentrated than secondary effluent. We examined the efficiency of several advanced oxidation processes (AOPs) on TOrC removal from a two-stage WWROC matrix in a pilot wastewater-treatment facility. WWROC ozonation or UV irradiation, with H2O2 addition, demonstrated efficient removal of TOrCs, varying between 21% and over 99% degradation, and indicating that radical oxidation (by HO·) is the dominant mechanism. However, AOPs are not sufficient to fully treat the WWROC, and thus, additional procedures are required to decrease metal ion and nutrient concentrations. Further biological treatment post-AOP is also highly important, to eliminate the degradable organic molecules obtained from the AOP.

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Gilboa, Yael, Yuval Alfiya, Sara Sabach, Eran Friedler, and Yael Dubowski. "H2S Removal from Groundwater by Chemical Free Advanced Oxidation Process Using UV-C/VUV Radiation." Molecules 26, no. 13 (June 30, 2021): 4016. http://dx.doi.org/10.3390/molecules26134016.

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Sulfide species may be present in groundwater due to natural processes or due to anthropogenic activity. H2S contamination poses odor nuisance and may also lead to adverse health effects. Advanced oxidation processes (AOPs) are considered promising treatments for hydrogen-sulfide removal from water, but conventional AOPs usually require continuous chemical dosing, as well as post-treatment, when solid catalysts are applied. Vacuum-UV (VUV) radiation can generate ·OH in situ via water photolysis, initiating chemical-free AOP. The present study investigated the applicability of VUV-based AOP for removal of H2S both in synthetic solutions and in real groundwater, comparing combined UV-C/VUV and UV-C only radiation in a continuous-flow reactor. In deionized water, H2S degradation was much faster under the combined radiation, dominated by indirect photolysis, and indicated the formation of sulfite intermediates that convert to sulfate at high radiation doses. Sulfide was efficiently removed from natural groundwater by the two examined lamps, with no clear preference between them. However, in anoxic conditions, common in sulfide-containing groundwater, a small advantage for the combined lamp was observed. These results demonstrate the potential of utilizing VUV-based AOP for treating H2S contamination in groundwater as a chemical-free treatment, which can be especially attractive to remote small treatment facilities.

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Sekar Nadisti, Meidina, Nur Annisa, Eva Fathul Karamah, Nelson Saksono, and Setijo Bismo. "Waste treatment of remazol blue compounds based on ozonation/AOP in a bubble column reactor." E3S Web of Conferences 67 (2018): 04017. http://dx.doi.org/10.1051/e3sconf/20186704017.

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Increased production in the textile industry has the potential to result in high dye waste water. Various conventional methods to handle with textile waste treatment have been done, but still considered not yet or less effective. The AOP technology (Advanced Oxidation Processes) applied in this research is a rapid degradation technology in textile wastes with advanced oxidation process through the formation of hydroxyl radical (OH) which is considered to optimize the degradation process of textile dye waste. This study aims to evaluate the performance of ozonation methods and AOP (O3/UV/H2O2) in dye degradation of textile wastewater containing remazol blue compounds. Both configuration methods used are optimized in several parameters such as waste flow rate, ozone voltage and pH to obtain maximum remazol blue degradation. From this study, the higher percentage to remazol blue degradation is 99.99%, which is achieved by AOP method, with double air injection air flow rate of 10 L/min and 0.25 L/min liquid flow rate.

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Ko, K. B., C. G. Park, T. H. Moon, Y. H. Ahn, J. K. Lee, K. H. Ahn, J. H. Park, and I. T. Yeom. "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 (September 1, 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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Kornmueller, A. "Review of fundamentals and specific aspects of oxidation technologies in marine waters." Water Science and Technology 55, no. 12 (June 1, 2007): 1–6. http://dx.doi.org/10.2166/wst.2007.379.

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This review is based on the existing literature and on our experiences in the application of different oxidation processes in brackish water and seawater. The oxidation reactions of advanced oxidation processes (AOPs) and the formation of disinfection byproducts (DBPs) are considerably different in marine waters from well-known drinking, process and wastewater applications. In contrast, the major secondary oxidants are bromine species in marine waters, which might form the DBPs of concern bromate and bromoform. An efficient AOP application needs knowledge of the source water constitutions and the oxidant demand. Besides changes in the oxidants chemistry compared to fresh water, the great and seasonal variation of marine waters has to be considered in the process design. The complexity of oxidant reactions and formation of byproducts are only partially researched and known as yet. Hence, it is advisable to determine the characteristic and variation of the water source as well as its influence on each AOP in experiments prior to the process design.

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Wacławek, Stanisław. "Do We Still Need a Laboratory to Study Advanced Oxidation Processes? A Review of the Modelling of Radical Reactions used for Water Treatment." Ecological Chemistry and Engineering S 28, no. 1 (March 1, 2021): 11–28. http://dx.doi.org/10.2478/eces-2021-0002.

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Abstract Environmental pollution due to humankind’s often irresponsible actions has become a serious concern in the last few decades. Numerous contaminants are anthropogenically produced and are being transformed in ecological systems, which creates pollutants with unknown chemical properties and toxicity. Such chemical pathways are usually examined in the laboratory, where hours are often needed to perform proper kinetic experiments and analytical procedures. Due to increased computing power, it becomes easier to use quantum chemistry computation approaches (QCC) for predicting reaction pathways, kinetics, and regioselectivity. This review paper presents QCC for describing the oxidative degradation of contaminants by advanced oxidation processes (AOP, i.e., techniques utilizing •OH for degradation of pollutants). Regioselectivity was discussed based on the Acid Blue 129 compound. Moreover, the forecasting of the mechanism of hydroxyl radical reaction with organic pollutants and the techniques of prediction of degradation kinetics was discussed. The reactions of •OH in various aqueous systems (explicit and implicit solvation) with water matrix constituents were reviewed. For example, possible singlet oxygen formation routes in the AOP systems were proposed. Furthermore, quantum chemical computation was shown to be an excellent tool for solving the controversies present in the field of environmental chemistry, such as the Fenton reaction debate [main species were determined to be: •OH < pH = 2.2 < oxoiron(IV)]. An ongoing discussion on such processes concerning similar reactions, e.g., associated with sulphate radical-based advanced oxidation processes (SR-AOP), could, in the future, be enriched by similar means. It can be concluded that, with the rapid growth of computational power, QCC can replace most of the experimental investigations related to the pollutant’s remediation in the future; at the same time, experiments could be pushed aside for quality assessment only.

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Feliciano, Adriane Rayssa Seguins, Alex Leandro Andrade de Lucena, Rayany Magali da Rocha Santana, Léa Elias Mendes Carneiro Zaidan, Pollyanna Michelle da Silva, Thiago Henrique Napoleão, Marta Maria Menezes Bezerra Duarte, and Daniella Carla Napoleão. "Advanced oxidation processes employment for the degradation of lamivudine: kinetic assessment, toxicity study and mathematical modeling." Water Quality Research Journal 55, no. 3 (July 3, 2020): 249–60. http://dx.doi.org/10.2166/wqrj.2020.010.

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Abstract Population growth has led to an increase in the production and use of synthetic compounds such as drugs, whose different classes are being investigated. However, the antiretrovirals are still poorly studied. Since the conventional treatments used in the effluent treatment plants have not been able to degrade these substances, other treatment techniques have been evaluated. Therefore, the objective of this work was to study and optimize the use of advanced oxidative processes (AOPs) in the degradation of lamivudine. It was found, initially, that the photo-peroxidation degraded 69% of the compound after 60 min of exposure to UV-C radiation, and that after evaluating the effect of the [H2O2], a degradation of 95% was achieved by using 250 mg L−1 of this reagent. The reaction kinetics showed a good fit to the pseudo-first-order model, and the artificial neural network MLP (3-12-1) demonstrated a good accuracy, managing to predict percentages of degradation for the studied AOP. Toxicity tests indicated an increase in the toxic effect on seeds, but the same was not observed in relation to enterobacteria. In general, the appropriateness of the application of AOP in the degradation of the aqueous solution has been demonstrated, with the largest studies regarding the effects of toxicity.

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GRANDO, Calina Ninfa, Matheus José Gomes DIEHL, and Clóvia Marozzin MISTURA. "TREATMENT OF WASTEWATER CONTAINING RHODAMINE BY ADVANCED OXIDATION PROCESS (AOP): FENTON, PHOTO-FENTON AND OZONATION." Periódico Tchê Química 13, no. 26 (August 20, 2016): 46–51. http://dx.doi.org/10.52571/ptq.v13.n26.2016.46_periodico26_pgs_46_51.pdf.

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The necessity for the conservation of natural resources and possible risks to human health have motivated efforts to minimize contamination problems. The agate dyeing and washing operations demand the utilization of considerable volumes of water and yield colored wastewater in addition to the possibility of high toxicity. The Advanced Oxidation Process (AOP) has been extensively evaluated, mainly due to its high capacity for degrading a large number of resistant substances with relatively low-cost procedures and simple operations. These processes are based upon the formation of the hydroxyl radical (OH•); which has a wide potential for oxidation. All three treatments yielded excellent results in color degradation.

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Galbičková, Blanka, Lenka Blinová, and Maroš Soldán. "Using of AOP Process for Phenol Removal from Wastewater." Advanced Materials Research 864-867 (December 2013): 1690–93. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1690.

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Advanced oxidation processes (AOPs) have been developed as an emerging technology for hazardous organic treatment in industrial wastewater. For phenol removing from wastewater traditional disinfection by chlorine is not appropriate because of generating more toxic pollutants - chlorophenols so AOPs are widely used for disinfection of this kind of water. In this paper for phenol degradation is used physico-chemical method (ozonization). Also influence of catalyst is monitored. As catalyst red mud and black nickel mud are used. These catalysts are waste from metal production. Results from analyses are compared.

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Tak, Surbhi, and Bhanu Prakash Vellanki. "Natural organic matter as precursor to disinfection byproducts and its removal using conventional and advanced processes: state of the art review." Journal of Water and Health 16, no. 5 (July 20, 2018): 681–703. http://dx.doi.org/10.2166/wh.2018.032.

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Abstract Natural organic matter (NOM) is ubiquitous in the aquatic environment and if present can cause varied drinking water quality issues, the major one being disinfection byproduct (DBP) formation. Trihalomethanes (THMs) are major classes of DBP that are formed during chlorination of NOM. The best way to remove DBPs is to target the precursors (NOM) directly. The main aim of this review is to study conventional as well as advanced ways of treating NOM, with a broad focus on NOM removal using advanced oxidation processes (AOPs) and biofiltration. The first part of the paper focuses on THM formation and removal using conventional processes and the second part focuses on the studies carried out during the years 2000–2018, specifically on NOM removal using AOPs and AOP-biofiltration. Considering the proven carcinogenic nature of THMs and their diverse health effects, it becomes important for any drinking water treatment industry to ameliorate the current water treatment practices and focus on techniques like AOP or synergy of AOP-biofiltration which showed up to 50–60% NOM reduction. The use of AOP alone provides a cost barrier which can be compensated by the use of biofiltration along with AOP with low energy inputs, making it a techno-economically feasible option for NOM removal.

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Tuerk, J., B. Sayder, A. Boergers, H. Vitz, T. K. Kiffmeyer, and S. Kabasci. "Efficiency, costs and benefits of AOPs for removal of pharmaceuticals from the water cycle." Water Science and Technology 61, no. 4 (February 1, 2010): 985–93. http://dx.doi.org/10.2166/wst.2010.004.

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Different advanced oxidation processes (AOP) were developed for the treatment of highly loaded wastewater streams. Optimisation of removal and improvement of efficiency were carried out on a laboratory, semiworks and pilot plant scale. The persistent cytostatic drug cyclophosphamide was selected as a reference substance regarding elimination and evaluation of the various oxidation processes because of its low degradability rate. The investigated processes are cost-efficient and suitable regarding the treatment of wastewater streams since they lead to efficient elimination of antibiotics and antineoplastics. A total reduction of toxicity was proven by means of the umuC-test. However, in order to reduce pharmaceuticals from the water cycle, it must be considered that the input of more than 80 % of the pharmaceuticals entering wastewater treatment systems results from private households. Therefore, advanced technologies should also be installed at wastewater treatment plants.

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Skіba, Margarita, and Olexandr Pivovarov. "PLASMA-ASSISTED ADVANCED OXIDATION PROCESS AND NOVEL MATERIALS FOR WATER AND WASTEWATER TREATMENT." WATER AND WATER PURIFICATION TECHNOLOGIES. SCIENTIFIC AND TECHNICAL NEWS 28, no. 3 (November 9, 2020): 37–47. http://dx.doi.org/10.20535/wptstn.v28i3.207254.

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The rapid growth in world population brings with it the need for improvement in the current technology for water purification, in order to provide adequate potable water to everyone. The plasma-based advanced oxidation process (AOP) is one of the most widely studied and best developed processes owing to its environmental compatibility, simple structure, efficiencies and ease of operation. In this study, a plasma-based AOP was stably generated using contact non-equilibrium low-temperature plasma and plasma synthesized composite nanomaterials (TiO2/Ag NPs) for water and wastewater purification. The degradation efficiency of the pollutants was determined by UV–Vis absorption spectroscopy. It was found that, due to the simultaneous production of highly reactive species, plasmas can efficiently eliminate pollutants that are difficult to remove using conventional methods. Aqueous solutions of various pollutants were treated by a low-pressure discharge. Experimental results indicated that CNP was effective for degradation azo dye pollutants (methylene blue (MB) and methyl orange MO) and antibiotics (ofloxacin (OFX) and ciprofloxacin (CFX)): МВ and МО were degraded by 98.5% and 97.0%, respectively after 3 min of plasma treatment; OFX and CFX were degraded by ~95.0% and 80.0%, respectively AOP by CNP indicated. The photodegradation of methylene blue catalyzed by plasma synthesized TiO2/Ag was studied under UV irradiation. The degradation (~91%) was obtained with 2.4 g/L TiO2/Ag within 90 min irradiation.

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Bairán, Gabriela, Georgette Rebollar-Pérez, Edith Chávez-Bravo, and Eduardo Torres. "Treatment Processes for Microbial Resistance Mitigation: The Technological Contribution to Tackle the Problem of Antibiotic Resistance." International Journal of Environmental Research and Public Health 17, no. 23 (November 28, 2020): 8866. http://dx.doi.org/10.3390/ijerph17238866.

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Advances generated in medicine, science, and technology have contributed to a better quality of life in recent years; however, antimicrobial resistance has also benefited from these advances, creating various environmental and health problems. Several determinants may explain the problem of antimicrobial resistance, such as wastewater treatment plants that represent a powerful agent for the promotion of antibiotic-resistant bacteria (ARB) and antibiotic resistance genes (ARG), and are an important factor in mitigating the problem. This article focuses on reviewing current technologies for ARB and ARG removal treatments, which include disinfection, constructed wetlands, advanced oxidation processes (AOP), anaerobic, aerobic, or combined treatments, and nanomaterial-based treatments. Some of these technologies are highly intensive, such as AOP; however, other technologies require long treatment times or high doses of oxidizing agents. From this review, it can be concluded that treatment technologies must be significantly enhanced before the environmental and heath problems associated with antimicrobial resistance can be effectively solved. In either case, it is necessary to achieve total removal of bacteria and genes to avoid the possibility of regrowth given by the favorable environmental conditions at treatment plant facilities.

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Petrovic, M., P. Gehringer, H. Eschweiler, and D. Barceló. "LC-MS-(MS) determination of oxidative degradation products of nonylphenol ethoxylates, carboxylates and nonylphenols in water." Water Science and Technology 50, no. 5 (September 1, 2004): 227–34. http://dx.doi.org/10.2166/wst.2004.0332.

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A commercial blend of nonylphenol ethoxylates (NPEOs) was chosen as representative for non-ionic polyethoxylated surfactants to study the oxidative degradation of this class of surfactants in water using ozonation as well as electron beam irradiation with and without the addition of ozone as treatment processes. The electron beam irradiation processes applied represent so-called Advanced Oxidation Processes (AOPs); the combined ozone/electron beam irradiation is, moreover, the most powerful AOP which can be applied in aqueous systems. It was found that both ozonation and the two AOPs applied were able to decompose not only the NPEOs but also the polyethyleneglycoles (PEGs) formed as by-products from NPEO degradation to residual concentrations below the limit of detection. Moreover, the treatment processes were also used to study the oxidative degradation of nonylphenoxy acetic acid (NPEC) and of nonylphenol (NP) which are formed as by-products from biodegradation of NPEOs.

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Alrousan, Dheaya, Arsalan Afkhami, Khalid Bani-Melhem, and Patrick Dunlop. "Organic Degradation Potential of Real Greywater Using TiO2-Based Advanced Oxidation Processes." Water 12, no. 10 (October 10, 2020): 2811. http://dx.doi.org/10.3390/w12102811.

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In keeping with the circular economy approach, reclaiming greywater (GW) is considered a sustainable approach to local reuse of wastewater and a viable option to reduce household demand for freshwater. This study investigated the mineralization of total organic carbon (TOC) in GW using TiO2-based advanced oxidation processes (AOPs) in a custom-built stirred tank reactor. The combinations of H2O2, O3, and immobilized TiO2 under either dark or UVA irradiation conditions were systematically evaluated—namely TiO2/dark, O3/dark (ozonation), H2O2/dark (peroxidation), TiO2/UVA (photocatalysis), O3/UVA (Ozone photolysis), H2O2/UVA (photo-peroxidation), O3/TiO2/dark (catalytic ozonation), O3/TiO2/UVA (photocatalytic ozonation), H2O2/TiO2/dark, H2O2/TiO2/UVA, H2O2/O3/dark (peroxonation), H2O2/O3/UVA (photo-peroxonation), H2O2/O3/TiO2/dark (catalytic peroxonation), and H2O2/O3/TiO2/UVA (photocatalytic peroxonation). It was found that combining different treatment methods with UVA irradiation dramatically enhanced the organic mineralization efficiency. The optimum TiO2 loading in this study was observed to be 0.96 mg/cm2 with the highest TOC removal (54%) achieved using photocatalytic peroxonation under optimal conditions (0.96 mg TiO2/cm2, 25 mg O3/min, and 0.7 H2O2/O3 molar ratio). In peroxonation and photo-peroxonation, the optimal H2O2/O3 molar ratio was identified to be a critical efficiency parameter maximizing the production of reactive radical species. Increasing ozone flow rate or H2O2 dosage was observed to cause an efficiency inhibition effect. This lab-based study demonstrates the potential for combined TiO2-AOP treatments to significantly reduce the organic fraction of real GW, offering potential for the development of low-cost systems permitting safe GW reuse.

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Wang, Feifei, Lu Zhang, Liangfu Wei, and Jan Peter van der Hoek. "Removal of Hydrogen Peroxide Residuals and By-Product Bromate from Advanced Oxidation Processes by Granular Activated Carbon." Water 13, no. 18 (September 7, 2021): 2460. http://dx.doi.org/10.3390/w13182460.

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During drinking water treatment, advanced oxidation process (AOP) with O3 and H2O2 may result in by-products, residual H2O2 and BrO3−. The water containing H2O2 and BrO3− often flows into subsequent granular activated carbon (GAC) filters. A concentrated H2O2 solution can be used as GAC modification reagent at 60 °C to improve its adsorption ability. However, whether low concentrations of H2O2 residuals from AOP can modify GAC, and the impact of H2O2 residuals on BrO3− removal by the subsequent GAC filter at ambient temperature, is unknown. This study evaluated the modification of GAC surface functional groups by residual H2O2 and its effect on BrO3− removal by GAC. Results showed that both H2O2 and BrO3− were effectively removed by virgin GAC, while pre-loaded and regenerated GACs removed H2O2 but not BrO3− anymore. At the ambient temperature 150 µmol/L H2O2 residuals consumed large amounts of functional groups, which resulted in the decrease of BrO3− removal by virgin GAC in the presence of H2O2 residuals. Redox reactions between BrO3− and surface functional groups played a dominant role in BrO3− removal by GAC, and only a small amount of BrO3− was removed by GAC adsorption. The higher the pH, the less BrO3− removal and the more H2O2 removal was observed.

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Colovic, Mirjana, Danijela Krstic, Vesna Vasic, Aleksandra Bondzic, Gordana Uscumlic, and Slobodan Petrovic. "Organophosphorus insecticides: Toxic effects and bioanalytical tests for evaluating toxicity during degradation processes." Chemical Industry 67, no. 2 (2013): 217–30. http://dx.doi.org/10.2298/hemind120323060c.

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Organophosphorus insecticides have been the most applied group of insecticides for the last two decades. Their main toxic effects are related to irreversible inactivation of acetylcholinesterase (AChE). Actually, they covalently bind to serine OH group in the enzyme active site forming phosphorylated enzyme that cannot hydrolyze acetylcholine. Organophosphorus insecticides in the environment undergo the natural degradation pathway including mainly homogeneous and heterogeneous hydrolysis (especially at high pH) generating non-inhibiting products. Additionally, thio organophosphates are easily oxidized by naturally present oxidants and UV light, forming more toxic and stable oxons. Thus, oxidative degradation procedures, generally referred as advanced oxidation processes (AOP), have been applied for their efficient removal from contaminated waters. The most applied bioassays to monitor the organophosphate toxicity i.e. the detoxification degree during AOP are Vibrio fischeri and AChE bioassays. Vibrio fischeri toxicity test exploits bioluminescence as the measure of luciferase activity of this marine bacterium, whereas AChE bioassay is based on AChE activity inhibition. Both bioanalytical techniques are rapid (several minutes), simple, sensitive and reproducible. Vibrio fischeri test seems to be a versatile indicator of toxic compounds generated in AOP for organophosphorus insecticides degradation. However, detection of neurotoxic AChE inhibitors, which can be formed in AOP of some organophosphates, requires AChE bioassays. Therefore, AChE toxicity test is more appropriate for monitoring the degradation processes of thio organophosphates, because more toxic oxo organophosphates might be formed and overlooked by Vibrio fischeri bioluminescence inhibition. In addition, during organophosphates removal by AOP, compounds with strong genotoxic potential may be formed, which cannot be detected by standard toxicity tests. For this reason, determination of incidence of micronuclei and cell proliferation index in cultivated human lymphocytes and fibroblasts is suitable for evaluation of organophosphorus insecticides and their break down products inducing cytogenetic damage.

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Hamada, Kengo, Tsuyoshi Ochiai, Yasuyuki Tsuchida, Kyohei Miyano, Yosuke Ishikawa, Toshinari Nagura, and Noritaka Kimura. "Eco-Friendly Cotton/Linen Fabric Treatment Using Aqueous Ozone and Ultraviolet Photolysis." Catalysts 10, no. 11 (November 2, 2020): 1265. http://dx.doi.org/10.3390/catal10111265.

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Chemicals for the scouring and bleaching of fabrics have a high environmental load. In addition, in recent years, the high consumption of these products has become a problem in the manufacture of natural fabric products. Therefore, environmentally friendly, low-waste processes for fabric treatment are required. In this paper, we discuss the bleaching of fabrics using advanced oxidation processes (AOP). These processes use electrochemically generated aqueous ozone and ultraviolet (UV) irradiation to achieve bleaching. However, colour reversion often occurs. In this study, we suppressed unwanted colour reversion by treatment with rongalite. After treatment, changes in fabric colour were determined by measuring the colour difference and reflectance spectra. The best bleaching effect was obtained when ozone and UV irradiation treatments were combined, achieving results similar to those of a conventional bleaching method after 60 min of UV irradiation. In addition, the AOP treatment resulted in the simultaneous scouring of the fabric, as shown by the increased hydrophilicity of the fabric after AOP treatment. Thus, this AOP process represents a new fabric bleaching process that has an extremely low environmental impact.

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Schrank, S. G., H. J. José, R. F. P. M. Moreira, and H. Fr Schröder. "Comparison of different advanced oxidation process to reduce toxicity and mineralisation of tannery wastewater." Water Science and Technology 50, no. 5 (September 1, 2004): 329–34. http://dx.doi.org/10.2166/wst.2004.0345.

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Many organic compounds contained in wastewater are resistant to conventional chemical and/or biological treatment. Because of this reason different degradation techniques are studied as an alternative to biological and classical physico-chemical processes. Advanced Oxidation Processes (AOPs) probably have developed to become the best options in the near future. AOP while making use of different reaction systems, are all characterised by the same chemical feature: production of OH radicals (*OH). The versatility of AOPs is also enhanced by the fact that they offer different possibilities for OH radical production, thus allowing them to conform to specific treatment requirements. The main problem with AOPs is their high cost. The application of solar technologies to these processes could help to diminish that problem by reducing the energy consumption required for generating UV radiation. In this work, different AOPs (O3, TiO2/UV, Fenton and H2O2/UV) were examined to treat tannery wastewater or as a pre-treatment step for improving the biodegradation of tannery wastewater, at different pH and dosage of the chemicals. Under certain circumstances retardation in biodegradation and/or an increase in toxicity may be observed within these treatment steps. Two different bioassays (Daphnia magna and Vibrio fischeri) have been used for testing the progress of toxicity during the treatment. In parallel other objectives were to analyse and identify organic compounds present in the untreated wastewater and arising degradation products in AOP treated wastewater samples. For this purpose substance specific techniques, e.g., gas chromatography - mass spectrometry (GC-MS) in positive electron impact (EI(+)) mode and atmospheric pressure ionisation (API) in combination with flow injection analysis (FIA) or liquid chromatography - mass and tandem mass spectrometry (LC-MS or LC-MS-MS) were performed.

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Tušar, Nataša Novak, Darja Maučec, Mojca Rangus, Iztok Arčon, Matjaž Mazaj, Magda Cotman, Albin Pintar, and Venčeslav Kaučič. "Manganese Functionalized Silicate Nanoparticles as a Fenton-Type Catalyst for Water Purification by Advanced Oxidation Processes (AOP)." Advanced Functional Materials 22, no. 4 (December 13, 2011): 820–26. http://dx.doi.org/10.1002/adfm.201102361.

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Müller, C., and O. Brandenberg. "Entfernung von Spurenstoffen und schwer abbaubaren Substanzen aus Industrieabwasser mittels Advanced Oxidation Processes (AOP) - Ansätze und Praxiserfahrungen." Chemie Ingenieur Technik 90, no. 9 (August 24, 2018): 1191–92. http://dx.doi.org/10.1002/cite.201855130.

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Onda, K., S. Y. Yang, A. Miya, and T. Tanaka. "Evaluation of estrogen-like activity on sewage treatment processes using recombinant yeast." Water Science and Technology 46, no. 11-12 (December 1, 2002): 367–73. http://dx.doi.org/10.2166/wst.2002.0764.

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Four sewage treatment plants based on an activated sludge process and a pilot scale plant for advanced sewage treatment located in Japan were evaluated for removal of estrogenic substances using in vitro recombinant yeast assay and chemical analysis. The results indicated that 17βl-estradiol (E2) significantly contributed to estrogen-like activity analyzed by yeast assay especially in secondary treated effluents. On the other hand, batch study showed that estrogen-like activity of spiked E2 was easily decreased by an activated sludge treatment. This result suggested that E2 concentrations measured by enzyme immunoassay (EIA) were interpreted as false positives in effluents, and that unknown estrogenic substances other than E2 might have contributed to estrogen-like activity in the secondary treated effluents. Further, in the pilot scale study, advanced sewage treatment processes such as a biological aerated filtration (BAF) process, an advanced oxidation process (AOP), were effective for the removal of those estrogenic activities contributed by unknown estrogenic substances in sewage secondary treated effluent.

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Zhao, Q., C. Shang, and X. Zhang. "Effects of bromide on UV/chlorine advanced oxidation process." Water Supply 9, no. 6 (December 1, 2009): 627–34. http://dx.doi.org/10.2166/ws.2009.679.

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High quantum yield (1.4 mol Es−1) of hydroxyl radicals (∙OH) from photolysis of chlorine under typical disinfection conditions indicates the potential of UV/chlorine coexposure in serving as both disinfection and advanced oxidation processes (AOP). In this study, photolysis of chlorine and bromine was explored in buffer and simulated natural water solutions under low-pressure UV (LPUV) and medium-pressure UV (MPUV) lamps. At pH 6.5 and 8.5, the quantum yields of bromine photolysis were 3.8 and 0.6 for MPUV, and 4.4 and 0.8 for LPUV, respectively. At pH 6.5, the photolysis of bromine was faster than that of chlorine under either MPUV or LPUV source, while at a higher pH of 8.5, the contrary was found. For all conditions tested, the presence of bromide did not significantly change the observed photolysis rate of total free halogen during the UV/chlorine process in the presence or absence of natural organic matter. Upon UV irradiation, chlorine always produces higher ∙OH concentration than bromine does. The presence of bromide results in considerable decrease of ∙OH concentration at pH 6.5, compared to that obtained from the UV/chlorine process in the absence of bromide.

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Galbičková, Blanka, Michal Belcik, Ivan Hrušovský, Maroš Soldán, Karol Balog, and Janka Ševčíková. "Hazard Analysis in Phenol Removal from Natural Water Sources." Advanced Materials Research 1001 (August 2014): 75–79. http://dx.doi.org/10.4028/www.scientific.net/amr.1001.75.

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AOP processes (Advanced Oxidation processes) are presently used as an alternative to traditional methods for removing of persistent pollutants from wastewater. Article is focused on removal of phenol from wastewater by using UV photodegradation. As a source of UV light medium pressure mercury lamp with output 400W is used. The aim of article is to perform hazard analysis in work with UV photoreactor by HAZOP method, eliminate risks in working with this equipment and propose corrective measures to improve quality of health and safety during work.

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Comninellis, Christos, Agnieszka Kapalka, Sixto Malato, Simon A. Parsons, Ioannis Poulios, and Dionissios Mantzavinos. "Advanced oxidation processes for water treatment: advances and trends for R&D." Journal of Chemical Technology & Biotechnology 83, no. 6 (2008): 769–76. http://dx.doi.org/10.1002/jctb.1873.

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Suzuki, Harufumi, Sadao Araki, and Hideki Yamamoto. "Evaluation of advanced oxidation processes (AOP) using O3, UV, and TiO2 for the degradation of phenol in water." Journal of Water Process Engineering 7 (September 2015): 54–60. http://dx.doi.org/10.1016/j.jwpe.2015.04.011.

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Amor, Carlos, Jorge Rodríguez-Chueca, Joana L. Fernandes, Joaquín R. Domínguez, Marco S. Lucas, and José A. Peres. "Winery wastewater treatment by sulphate radical based-advanced oxidation processes (SR-AOP): Thermally vs UV-assisted persulphate activation." Process Safety and Environmental Protection 122 (February 2019): 94–101. http://dx.doi.org/10.1016/j.psep.2018.11.016.

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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 (January 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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Pieczykolan, Barbara, Izabela Płonka, Krzysztof Barbusiński, and Magdalena Amalio-Kosel. "Comparison of Landfill Leachate Treatment Efficiency Using the Advanced Oxidation Processes." Archives of Environmental Protection 39, no. 2 (June 1, 2013): 107–15. http://dx.doi.org/10.2478/aep-2013-0016.

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Abstract Treatment of leachate from an exploited since 2004 landfill by using two methods of advanced oxidation processes was performed. Fenton’s reagent with two different doses of hydrogen peroxide and iron and UV/H2O2 process was applied. The removal efficiency of biochemically oxidizable organic compounds (BOD5), chemically oxidizable compounds using potassium dichromate (CODCr) and nutrient (nitrogen and phosphorus) was examined. Studies have shown that the greatest degree of organic compounds removal expressed as a BOD5 index and CODCr index were obtained when Fenton’s reagent with greater dose of hydrogen peroxide was used - efficiency was respectively 72.0% and 69.8%. Moreover, in this case there was observed an increase in the value of ratio of BOD5/CODCr in treated leachate in comparison with raw leachate. Application of Fenton’s reagent for leachate treatment also allowed for more effective removal of nutrients in comparison with the UV/H2O2 process.

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Oliveira, Marcos André Soares de, Naiana Santos da Cruz Santana Neves, Rayany Magali da Rocha Santana, Alex Leandro Andrade de Lucena, Léa Elias Mendes Carneiro Zaidan, Vanessa De Oliveira Marques Cavalcanti, Gilson Lima da Silva, and Daniella Carla Napoleão. "Employment of advanced oxidation processes in the degradation of a textile dye mixture: evaluation of reaction parameters, kinetic study, toxicity and modeling by artificial neural networks." Revista Eletrônica em Gestão, Educação e Tecnologia Ambiental 25 (April 6, 2021): e12. http://dx.doi.org/10.5902/2236117063909.

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Organic contaminants in industrial effluents threaten the quality of water resources, especially due to their resistance to natural degradation. The textile industry gain relevance, considering that it generates large volumes. This work aimed to evaluate the efficiency of different advanced oxidation processes (AOP) for the degradation of the mixture textile dyes in solution. After optimization of the main parameters involved in the applied processes and systems, the AOP with greater efficiency in the degradation of the compounds was the photo-Fenton/UV-C (92%) after 360 min of treatment. The experimental data showed a better fit to the Chan and Chu kinetic model and trough an evaluation using artificial neural networks it was possible to predict the maximum degradation achievable by the dye mixture. The toxicity assays, using multiple species of seeds indicated a treated solution with no toxic effects and that the applied methodology can be used without affecting the water resources.

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Mirza, Nouman Rafique, Ray Huang, Erdeng Du, Mingguo Peng, Zhigang Pan, Hui Ding, Guocheng Shan, Ling Ling, and Zongli Xie. "A review of the textile wastewater treatment technologies with special focus on advanced oxidation processes (AOPs), membrane separation and integrated AOP-membrane processes." DESALINATION AND WATER TREATMENT 206 (2020): 83–107. http://dx.doi.org/10.5004/dwt.2020.26363.

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Yan-yang, Chu, Qian Yi, and Bai Mao-juan. "Three advanced oxidation processes for the treatment of the wastewater from acrylonitrile production." Water Science and Technology 60, no. 11 (December 1, 2009): 2991–99. http://dx.doi.org/10.2166/wst.2009.691.

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A new advanced oxidation processes: electrochemical oxidation with iron promoting (EOIP) was presented and the treatment of an actual industrial wastewater from acrylonitrile production by three advanced oxidation processes (AOPs) has been studied: Fenton oxidation (FO), electro-Fenton oxidation (EFO), and electrochemical oxidation with iron promoting (EOIP). It was found that all the three processes were able to treat this wastewater, but different results in terms of efficiency and different behaviors were obtained. When the same dosage of H2O2 was added to the wastewater, the oxidation power of three AOPs increased in the order: FO < EFO < EOIP. Under the condition of higher dosage of H2O2, the three AOPs applied could achieve the better color removal. When the dosage of H2O2 was lower than 1,500 mg l−1, the color of the wastewater after treated increased from FO and EFO due to the formation of Fe (III) complexes, but this was not found in EOIP. The results of this work indicate that EOIP is a promising alternative for COD and color removal from organic wastewater.

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Journal articles on the topic 'Advanced oxidation processes (AOP)'

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