Academic literature on the topic 'Photo–Fenton process'
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Journal articles on the topic "Photo–Fenton process"
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Wang, Shunwu, Ziwang Li, and Qinglong Yu. "Kinetic degradation of guar gum in oilfield wastewater by photo-Fenton process." Water Science and Technology 75, no. 1 (October 7, 2016): 11–19. http://dx.doi.org/10.2166/wst.2016.470.
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Guar gum is considered as a main component of oilfield wastewater. This work is intended to optimize the experimental conditions (H2O2 dosage, Fe2+ dosage, initial concentration of organics, initial pH and temperature) for the maximum oxidative degradation of guar gum by Fenton's reagent. The kinetics of guar gum removal were evaluated by means of the chemical oxygen demand (COD) and the absorbance measurements. The batch experiment results showed that the optimum conditions were: H2O2 dosage, 10,000 mg/L; Fe2+dosage, 2,000 mg/L; initial concentration of organics, 413 mg/L; pH, 3 and temperature, 35 °C, under which the COD removal could reach 61.07% and fairly good stability could be obtained. Under the optimum experimental conditions, using UV irradiation to treat the wastewater, the photo-Fenton systems can successfully eliminate COD from guar gum solution. The COD removal always obeyed a pseudo-first-order kinetics and the degradation rate (kapp) was increased by 25.7% in the photo-Fenton process compared to the Fenton process. The photo-Fenton system needed less time and consequently less quantity of H2O2 to obtain the same results as the Fenton process. The photo-Fenton process needs a dose of H2O2 20.46% lower than that used in the Fenton process to remove 79.54% of COD. The cost of the photo/Fenton process amounted to RMB9.43/m3, which was lower than that of the classic Fenton process alone (RMB10.58/m3) and the overall water quality of the final effluent could meet the class Ι national wastewater discharge standard for the petrochemical industry of China.
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Ban, F. C., X. T. Zheng, and H. Y. Zhang. "Photo-assisted heterogeneous Fenton-like process for treatment of PNP wastewater." Journal of Water, Sanitation and Hygiene for Development 10, no. 1 (February 6, 2020): 136–45. http://dx.doi.org/10.2166/washdev.2020.087.
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Abstract The purpose of this study was to investigate the effect of photo-assisted heterogeneous Fenton on p-nitrophenol (PNP) wastewater treatment by a homemade reactor. Supported Fe-Ce/Al2O3 was used as a catalyst and H2O2 as an oxidant to treat simulated p-nitrophenol wastewater under ultraviolet light. The effects of H2O2 dosage, catalyst dosage, initial solution pH value, reaction temperature and reaction time on the removal rate of p-nitrophenol in a photo-assisted heterogeneous Fenton system were determined. According to the relation between the concentration of each component and time, the relation curve is fitted, and then the kinetic equation is established. Finally, we obtained the optimum process conditions to achieve the PNP wastewater removal rate of 98.7%. The degradation of the photo-assisted heterogeneous Fenton method conforms to the first-order kinetic model, and the kinetic equation is . Therefore, photo-assisted heterogeneous Fenton treatment of PNP wastewater is effective and can be used in the treatment of refractory wastewater.
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Journal, Baghdad Science. "Degradation of Brilliant Green by Using a bentonite Clay- Based Fe Nano Composite Film as a Heterogeneous Photo- Fenton Catalyst." Baghdad Science Journal 13, no. 3 (September 4, 2016): 524–30. http://dx.doi.org/10.21123/bsj.13.3.524-530.
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This paper aims to study the chemical degradation of Brilliant Green in water via photo-Fenton (H2O2/Fe2+/UV) and Fenton (H2O2/Fe2+) reaction. Fe- B nano particles are applied as incrustation in the inner wall surface of reactor. The data form X- Ray diffraction (XRD) analysis that Fe- B nanocomposite catalyst consist mainly of SiO2 (quartz) and Fe2O3 (hematite) crystallites. B.G dye degradation is estimated to discover the catalytic action of Fe- B synthesized surface in the presence of UVC light and hydrogen peroxide. B.G dye solution with 10 ppm primary concentration is reduced by 99.9% under the later parameter 2ml H2O2, pH= 7, temperature =25°C within 10 min. It is clear that pH of the solution affects the photo- catalytic degradation of B.G dye. All the conditions above have been studied to reach the optimum operation condition for the two processes Fenton and photo- Fenton. The B.G degradation process follows first- order reaction rules. Photo- Fenton process causes a more efficient oxidation rate than the Fenton process. So, the photo- Fenton degradation is an effective and economic process by producing higher percentage of degradation and mineralization in short radiation time.
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Singa, Pradeep Kumar, Mohamed Hasnain Isa, Yeek-Chia Ho, and Jun-Wei Lim. "Mineralization of Hazardous Waste Landfill Leachate using Photo-Fenton Process." E3S Web of Conferences 65 (2018): 05012. http://dx.doi.org/10.1051/e3sconf/20186505012.
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This study was conducted to evaluate the COD removal efficiency of Photo-Fenton oxidation process. The reagents used in the Photo-Fenton process are catalyst Fe2+ and H2O2 as oxidizing agent. A 16W UV lamp was used to carry out the experiments. All the experiments were performed in batch mode to investigate the influence of operating conditions viz., Fenton reagents dosage, molar ratio and reaction time. The maximum COD removal observed was 68% under optimum operating conditions. The operating conditions H2O2/Fe2+ molar ratio = 3 and reaction time = 90 minutes were found to optimum. The dosages of Fenton reagents i.e. hydrogen peroxide and Fe2+ were optimum at 0.09 mol/L and 0.03 mol/L respectively.
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Urbano, Vanessa Ribeiro, Milena Guedes Maniero, José Roberto Guimarães, Luis J. del Valle, and Montserrat Pérez-Moya. "Sulfaquinoxaline Oxidation and Toxicity Reduction by Photo-Fenton Process." International Journal of Environmental Research and Public Health 18, no. 3 (January 23, 2021): 1005. http://dx.doi.org/10.3390/ijerph18031005.
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Sulfaquinoxaline (SQX) has been detected in environmental water samples, where its side effects are still unknown. To the best of our knowledge, its oxidation by Fenton and photo-Fenton processes has not been previously reported. In this study, SQX oxidation, mineralization, and toxicity (Escherichia coli and Staphylococcus aureus bacteria) were evaluated at two different setups: laboratory bench (2 L) and pilot plant (15 L). The experimental design was used to assess the influence of the presence or absence of radiation source, as well as different H2O2 concentrations (94.1 to 261.9 mg L−1). The experimental conditions of both setups were: SQX = 25 mg L−1, Fe(II) = 10 mg L−1, pH 2.8 ± 0.1. Fenton and photo-Fenton were suitable for SQX oxidation and experiments resulted in higher SQX mineralization than reported in the literature. For both setups, the best process was the photo-Fenton (178.0 mg L−1 H2O2), for which over 90% of SQX was removed, over 50% mineralization, and bacterial growth inhibition less than 13%. In both set-ups, the presence or absence of radiation was equally important for sulfaquinoxaline oxidation; however, the degradation rates at the pilot plant were between two to four times higher than the obtained at the laboratory bench.
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Dugandzic, Ana, Andjelka Tomasevic, Dunja Dabic, Natasa Sekuljica, Marina Radisic, Slobodan Petrovic, and Dusan Mijin. "Degradation of nicosulfuron using fenton and fenton-like reactions." Chemical Industry and Chemical Engineering Quarterly 24, no. 3 (2018): 201–8. http://dx.doi.org/10.2298/ciceq170617032d.
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Nicosulfuron, a sulfonylurea herbicide, was subjected to different Fenton reactions at pH of a nicosulfuron aqueous solution (pH 5). Usually, the optimal pH for the Fenton reaction is between 3 and 4, but the addition of acids is not environmentally acceptable. This is the reason why the reactions were performed at a higher pH value than usual. So, classical Fenton and Fenton-like reactions were applied as well as photo-Fenton and photo-Fenton-like reactions. In addition, microwave Fenton and Fenton-like reactions were used in nicosulfuron degradation. Influences of Fe2+ and Fe3+ concentrations, as well as hydrogen peroxide concentrations, were studied. The Fenton reaction was much faster and more efficient than the Fenton-like reaction, while the photo- Fenton reaction proceeded much faster and more efficiently than the Fenton reaction. The microwave-Fenton and microwave-Fenton-like reactions proceeded with increased efficiency in comparison to the Fenton and Fenton-like reactions. The phytotoxicity and acute toxicity of the reaction products of nicosulfuron oxidation by the photo-Fenton reaction were analyzed. The toxicity testing of nicosulfuron treatment by photo-Fenton process showed a decrease in phytotoxicity, while the acute toxicity tests showed that the samples after treatment had lower toxicity.
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Journal, Baghdad Science. "Degradation of Dazomet by Thermal Fenton and Photo-Fenton Processes under UV and Sun lights at Different Temperatures." Baghdad Science Journal 15, no. 2 (June 3, 2018): 158–68. http://dx.doi.org/10.21123/bsj.15.2.158-168.
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In this research, the degradation of Dazomet has been studied by using thermal Fenton process and photo-Fenton processes under UV and lights sun. The optimum values of amounts of the Fenton reagents have been determined (0.07g FeSO4 .7H2O, 3.5µl H2O2) at 25 °C and at pH 7 where the degradation percentages of Dazomet were recorded high. It has been found that solar photo Fenton process was more effective in degradation of Dazomet than photo-Fenton under UV-light and thermal Fenton processes, the percentage of degradation of Dazomet by photo-Fenton under sun light are 88% and 100% at 249 nm and 281 nm respectively, while the percentages of degradation for photo-Fenton under UV-light are 87%, 96% and for thermal Fenton are 70% and 66.8% at 249 nm and 281 nm respectively. In this research the effect of temperature on all the reactions has been studied in the range 25°C-45°C, it has been noticed that the reaction rate constant (k) has increased with increasing temperature, and the best percentage degradation of Dazomet was at 45°C in all processes, so, the thermodynamic functions ?G*, ?H*, ?S* have been calculated
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Rehman, Faiza, Murtaza Sayed, Javed Ali Khan, Luqman Ali Shah, Noor S. Shah, Hasan M. Khan, and Rozina Khattak. "Degradation of Crystal Violet Dye by Fenton and Photo-Fenton Oxidation Processes." Zeitschrift für Physikalische Chemie 232, no. 12 (November 27, 2018): 1771–86. http://dx.doi.org/10.1515/zpch-2017-1099.
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Abstract The oxidative degradation of CV dye in aqueous media has been evaluated using Fenton (Fe2+/H2O2) and photo-Fenton (Fe2+/H2O2/UV) processes. Various operational parameters like H2O2 dosages, Fe2+ dosages and [CV]0 were optimized of both Fenton and photo-Fenton processes for the removal of CV dye from aqueous media. Kinetic results indicated that photo-Fenton process (kobs=0.0097 min−1, t1/2=71.45 min) is more effective than Fenton process (kobs=0.0074 min−1, t1/2=93.66 min). Second order rate constant of ˙OH radical with CV dye was calculated to be 3.96×109 M−1s−1. De-methylated organic intermediates of CV dye detected by LC-MS and some other intermediates like CH3COO−, HCOO−, NH4+ and Cl− were identified by ion-chromatography.
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Wadley, S., and T. D. Waite. "Photo-Fenton oxidation of pesticides." Water Supply 2, no. 5-6 (December 1, 2002): 249–56. http://dx.doi.org/10.2166/ws.2002.0176.
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The photo-Fenton process is becoming a practical treatment option for waters contaminated with pesticides and other organic compounds that are poorly biodegradable. This process can potentially be integrated into an existing water treatment process to enhance organic compound removal. It can operate at low concentrations of contaminant and can often completely mineralise the compound or convert it into a less toxic form. The process is most efficient at around pH 2.8; however, it has been found that with the addition of suitable complexing agents for Fe(III), the process can be operated at close to neutral pH. This study used citric acid as a complexing agent, 2,4-dichlorophenol (DCP) as a model contaminant and investigated the extension of the feasible pH range of the process from pH 5 to pH 8. The study involved synthetic solutions and light from a mercury arc lamp, with a bandpass filter used to isolate the emission band at around 360 nm. Low concentrations of DCP (12 μM) and Fe(II) (10 mM) were used to simulate conditions possible in the environment. In this work, no H2O2 was added, however, a relatively high concentration of citrate (100 μM) was used. Citrate is itself degraded in the process, and since it is highly biodegradable any excess could be consumed in a subsequent biological treatment process. The extent of degradation of DCP after 2 hours was found to be 91% at pH 5, 73% at pH 6, 74% at pH 7, and 59% at pH 8.
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Tokumura, Masahiro, Mizuyo Sekine, Maki Yoshinari, Hussein T. Znad, and Yoshinori Kawase. "Photo-Fenton process for excess sludge disintegration." Process Biochemistry 42, no. 4 (April 2007): 627–33. http://dx.doi.org/10.1016/j.procbio.2006.11.010.
Full textDissertations / Theses on the topic "Photo–Fenton process"
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Ng, Chi Po. "Treatment of textile wastewater by combined photo-fenton and biological process /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?EVNG%202005%20NG.
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Tessaro, Elias Paulo. "Avaliação de processos oxidativos para o tratamento ambientalmente adequado de fluidos de corte." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/75/75132/tde-20062008-165020/.
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Durante o processo metalúrgico de usinagem de uma peça ocorre a geração de calor proveniente do atrito ferramenta/peça e cavaco/ferramenta. Para que ocorra uma menor geração de calor possibilitando o manuseio, bem como a minimização na deformação da peça, utilizam-se fluidos, que são soluções lubrificantes à base de óleos, água ou polímeros, podendo ser sintéticos ou não, diminuindo, assim, o coeficiente de atrito reduzindo-se a quantidade de calor gerado no processo. Há uma grande variedade de fluidos de corte disponíveis no mercado que são constituídos por diversos compostos como: aminas, compostos clorados e/ou aromáticos, glicóis, nitrosaminas além da presença de metais provenientes do processo de manufatura, portanto, sem tratamento, não podem ser lançados na rede de esgoto convencional. Atualmente não há um método de tratamento para os fluidos de corte nas indústrias. Nesse contexto, propõe-se um estudo sobre a viabilidade dos tipos de tratamento dos fluidos de corte para uma disposição adequada. Os processos de tratamento propostos neste trabalho compreendem hidrolise ácida e Processo Oxidativo Avançado (POA), mais especificamente, Sistema Fenton, além de propor um tratamento baseado na fotodegradação. A caracterização do fluido antes e após seu tratamento foi realizada por técnicas analíticas e espectrométricas. Os processos oxidativos mostraram-se satisfatórios para o tratamento dos efluentes, reduzindo os níveis de contaminantes aos permitidos pela legislação. O processo foto-Fenton mostrou-se mais eficiente que o processo Fenton na degradação de todos os parâmetros avaliados, incluindo BTEX e HPAs. Os processos de hidrólise ácida não apresentaram resultados satisfatórios, reduzindo apenas os metais aos níveis permitidos para descarte.During the cutting process, part of the heat generation results from tool-part and chip-tool friction. So that it happens a smaller generation of heat making possible the handling, as well as minimization in the tool deformation, cutting fluids are used, that are the oils base, water or polymeric lubricating solutions, could be synthetic or no, decreasing the attrition coefficient being reduced the amount of heat generated in the process. There is a great variety of cutting fluids that are constituted for several composed as: amines, chlorinated and/or aromatic composed, glycols and nitrosamines besides the presence of metals proceeding of manufacture process, therefore, without a treatment, they cannot be discarded in the conventional sewerage system. At the moment there isn\'t a treatment method for the cut fluids in the industries. In that context, intends a study about the viability types of cutting fluids treatment for appropriate disposition. Treatment processes proposed in this work understand acid hydrolysis and Advanced Oxidative Process (AOP), more specifically, Fenton System, in addition proposing a treatment based on the photodegradation (photo-Fenton process). The characterization of fluid before and after treatment it was accomplished by analytical and spectrometry techniques. Oxidative processes were exposed satisfactory for cutting fluids treatment, reducing the levels of pollutants to the allowed by the legislation. Photo-Fenton process was shown more efficient than Fenton process in the oxidation of BTEX and PAHs. Acid hydrolysis processes didn\'t present satisfactory results, just reducing the metals at the levels allowed for discard.
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Gordana, Pucar Milidrag. "Primena modifikovanog bentonita kao katalizatora u Fenton i foto-Fenton procesu uklanjanja tekstilne reaktivne boje." Phd thesis, Univerzitet u Novom Sadu, Prirodno-matematički fakultet u Novom Sadu, 2019. https://www.cris.uns.ac.rs/record.jsf?recordId=110666&source=NDLTD&language=en.
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Cilj ovog rada bio je ispitivanje mogućnosti primene modifikovanog bentonita kao katalizatora (ferioksalat i Al, Fe-bentonit katalizatori) u Fenton i foto-Fenton procesu uklanjanja tekstilne reaktivne boje Reactive Red 120. Do sada su objavljene studije primene heterogenog Fenton procesa sa različitim koncentracijama gvožđau katalizatorima i sa kompleksom ferioksalata,međutim, njihovo poređenje u smislu efikasnosti obezbojavanja nije istraženo, što je bio jedan od fokusa istraživanja u ovom radu. Osim toga, potencijal sunčeve energije predstavlja 16,7% od ukupno iskoristivog potencijala obnovljivih izvora energije u Srbiji, dok je prosečno sunčevo zračenje u Srbiji oko 40% više od evropskog proseka, čineći ga vrlo zanimljivim za primenu u ovom tipu tretmana. U cilju što boljeg iskorišćenjasunčevog zračenja i unapređenja fotokatalitičkih performansi procesa primenjen je parabolični koncentrišući reaktor, koji je za ovu vrstu procesa prvi put upotrebljavan. Proučavano je u kojoj meri je solarna fotokataliza značajan segment tehnike za tretman otpadnih voda tokom degradacije perzistentnih jedinjenja, kao što je organska azo boja. Takođe, utvrđen je i potencijal fotolize vodonik-peroksida za obezbojavanjem sintetičkog rastvora date boje. Prva faza imala je za cilj sintezu materijala primenom različitih metoda pripreme ikonstrukciju solarnog paraboličnog reaktora, koji će se koristiti u Fenton i foto-Fenton procesima degradacije boje Reactive Red 120. Druga faza je podrazumevala karakterizaciju novosintetisanih materijala i optimizaciju procesa fotokatalize primenom Fenton i foto-Fenton procesa i određivanje postignutih efikasnosti primenjenih procesa. Takođe, vršeno je određivanje stepena mineralizacije i identifikacija degradacionih produkata nakon procesa degradacije tekstilne boje Reactive Red 120, kao i primena foto-Fenton procesa na realnom efluentu. Na osnovu dobijenih rezultata tokom primene Fenton procesa i korišćenjem oba tipa katalizatora u periodima niskog i visokog intenziteta zračenja, sa aspekta postizanja visoke efikasnosti obezbojavanja i najmanjeg izluživanja gvožđa,može se zaključiti da je Fenton proces najefikasniji na pH vrednosti 3. AlFeB je pokazao veću reaktivnost čak i pri manje upotrebljenim dozama od0,05 g u odnosu na CuOFeB (0,2 g), kao i mogućnost manje upotrebe vodonik-peroksida od 2,5 mM, za postizanje visoke efikasnosti obezbojavanja i postignut visok stepen mineralizacije. Viši intenzitet sunčevog zračenja omogućava odvijanje reakcije obezbojavanja na višim pH vrednostima primenom oba katalizatora tokom fotoFenton procesa. Ovo je posebno izraženo kod CuOFeB tokom letnjeg perioda (pH 7), čak i pri nižim dozama katalizatora. Međutim, najveći udeo u procesu obezbojavanja pri upotrebi CuOFeB katalizatora ima fotoliza vodonik-peroksida (80%). Suprotno ovim rezultatima, pri istim reakcionim uslovima, potrebna je veća količina AlFeB katalizatora (0,1 g) i niža pH vrednost reakcije, a efikasnost procesa značajno zavisi od početne koncentracije H 2O2. Činjenica da se u pripremi katalizatora koristio bentonit kao prirodan, širokorasprostranjen i jeftin materijal i solarno zračenje kao obnovljiv i alternativni izvor fotona, gore navedene rezultate bi trebalo uzeti u obzir prilikom analize troškova efikasnosti primenjenog procesa. Takođe, primena unapređenih procesa oksidacije se razmatra kao predlog za najbolju dostupnu tehniku kada je u pitanju tretman otpadne vode tekstilne industrije, dok se kao dodatne nove tehnike uzimaju u obzir foto-oksidacije i ispitivanje mogućnosti njihove primene u prečišćavanju otpadne vode u tercijarnom tretmanu na poluindustrijskim sistemima. The aim of this study was to investigate the decolorization efficiency of Reactive Red 120 (RR120) synthetic solution using ferrioxalate (CuOFeB) and Al, Fe-bentonite (AlFeB) catalysts in Fenton and photo-Fenton process. So far, studies of the application of a solar-assisted heterogeneous Fenton process with various Fe loaded catalysts and with ferrioxalate complex have been published, but according to the author’s knowledge, their comparison in terms of efficacy of decolorization has not been performed, which was one of the focus of research in this paper. In addition, the potential of solar energy represents 16.7% of the total utilized potential of renewable energy sources in Serbia, while the average solar radiation in Serbia is about 40% higher than the European average, making it very interesting for application in this type of treatment. In order to optimize the use of solar radiation and to improve the photocatalytic performance of the process, parabolic concentrating reactor was used for the first time. As a significant segment of the wastewater treatment technique during the degradation of persistent compounds, such as organic azo dye, solar photocatalysis was studied. Also, the potential of photolysis of hydrogen peroxide for decolorization of the synthetic dye solution was determined. Aim of the first phase of the study was synthesizing materials by using different methods of preparation, and construction of a solar parabolic reactor, which will be used in Fenton andphoto-Fenton dye degradation processes. The second phase involved the characterization of newlysynthesized materials and the optimization of the photocatalytic process by applying Fenton and photo-Fonton processes, as well as the determination of achieved efficiency of the appliedprocesses. Also, the degree of mineralization and the identification of degradation products after applied processes were determined. Application of the photo-Fenton process on a real effluent was conducted as well. Based on the obtained results during Fenton process and using both types of catalysts in periods of low and high intensity of radiation, from the aspect of achieving high efficiency of decolorization and smallest iron leaching, it can be concluded that the Fenton process is most effective at pH 3. AlFeB showed greater reactivity even at less used doses of 0.05 g, compared to CuOFeB (0.2 g), and the possibility of using less hydrogen peroxide (2.5 mM), achieving high efficiency and a high degree of mineralization. Higher intensity of solar radiationallows the reaction to be carried out at higher pH values when using both catalysts during the photo-Fenton process. This is particularly pronounced largest part in the decolorization process using the CuOFeB catalyst has a photolysis of hydrogen peroxide (80%). Contrary to these results, under the same reaction conditions, a higher doses of AlFeB catalyst (0.1 g) is needed at lower pH value of the reaction, and the process efficiency is significantly dependent on the initial concentration of H 2O2. The fact that in the preparation of the catalysts bentonite as a natural, abundant, inexpensive material was used and solar radiation as a renewable and alternative source of photons, the above results should be taken into account in the cost-effectiveness analysis of the applied process. Also, the application of advanced oxidation processes is considered as a proposal for the best available technique when it comes to the treatment of wastewater from the textile industry, while as additional new techniques, photooxidation is considered as a candidate and the possibility of their application in the treatment of wastewater in tertiary treatment on semi-industrial systems.
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Yamal, Turbay Evelyn. "Efficient operation of photo-Fenton process for the treatment of emerging contaminants in water solutions." Doctoral thesis, Universitat Politècnica de Catalunya, 2013. http://hdl.handle.net/10803/134805.
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The growth of population density in some areas of the planet and the increasing fast advances in technology and energy issues, have resulted in a remarkable increment in the necessity for goods and services, with a subsequent over-exploitation and pollution of the environmental resources. Water, a non-renewable resource, does not escape from the harmful effects of human activity and its increasing pollution levels threaten the normal development of ecosystems and life as well.
In the last decades, the occurrence of a new generation of contaminants has been detected in wastewaters, surface and underground waters, and even in drinking water. These substances, called "emerging contaminants" or "emerging pollutants", are not subject to regulation, but their recalcitrant character and their effects as endocrine disruptors suggest that their bio-accumulation will have severe consequences to the environment. These non-biodegradable compunds cannot be removed in conventional wastewater treatment plants, and there is a need for chemical processes to oxidize them at least to bio-degradable or non-toxic species. Advanced oxidation processes (AOPs) have demonstrated to be particularly useful in degrading and eventually mineralizing emerging contaminants, but the complexity of their mechanisms and the high reagent and energy costs involved, make necessary to develop options to improve their performance.
This thesis specifically addresses the photo-Fenton process, an advanced oxidation process which has been widely applied and has demonstrated to be efficient in the degradation of recalcitrant organic contaminants. The objective of this thesis is to investigate and to propose operating alternatives to improve the performance of photo-Fenton process. For that aim, it was necessary to fulfill some specific objectives: to perform a detailed study of the variables involved in the process, propose its enhancement throughout a systematic dosage of hydrogen peroxide along the treatment span, simulate the process and to investigate opportunities to optimize the process batch recipe.
In the first stage of the investigation, with a clear experimental approach, the variables involved in the process were studied and a novel, flexible and easy-to-implement hydrogen peroxide systematic dosage protocol was proposed, improving the mineralization of three emerging contaminants, reaching almost total mineralization in some of the cases. However, the effectiveness of the protocol is strongly influenced by the crossed effect between the involved parameters.
In a subsequent stage, a computational approach, the process involving the proposed dosage protocol is simulated and the performance of the process was predicted at different operational conditions. The opportunities for improving process performance when the parameters concerning the dosage protocol are conveniently adjusted can be addressed. Finally, taking a step forward, a first attempt to investigate the alternatives for process optimization was investigated, demonstrating that operational costs can be reduced without diminishing the quality of the final product.
As a final remark, this thesis supposes a step forward in the improvement of advanced oxidation processes and it opens the door to continue developing strategies to model, simulate and optimize these complex processes.
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LEITE, Mirella de Andrade Loureiro. "Tratamento de lixiviado de aterros urbanos utilizando o processo foto-fenton combinado à coagulação/floculação." Universidade Federal de Pernambuco, 2016. https://repositorio.ufpe.br/handle/123456789/18632.
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A presente pesquisa foi motivada pelo desafio em propor um tratamento, em escala laboratorial, para degradar eficientemente os poluentes dos lixiviados provenientes do Aterro Sanitário de Altinho – PE, localizado no Agreste do Estado e em funcionamento e Aterro Controlado da Muribeca – PE, localizado na Região Metropolitana do Recife e fechado desde 2009. Assim, baseado na característica de alta carga orgânica, porém baixa biodegradabilidade dos lixiviados, foi realizado um tratamento físico-químico com aplicação dos processos de coagulação/floculação (CF) e oxidativos avançados do tipo foto-Fenton. Inicialmente, foi feito um tratamento preliminar dos lixiviados por meio de um planejamento fatorial 24, tendo como variáveis independentes: massa do coagulante hidróxido de cálcio, tempo e velocidade de rotação de floculação e tempo de sedimentação. Em seguida, foi aplicado o processo de fotoFenton, sob as mesmas condições, ao sobrenadante proveniente das amostras pré-tratadas por CF e diretamente às amostras brutas. Os resultados mostraram remoções de 89,6% e 83,4% de DQO para a amostra pré-tratada por CF e bruta de Altinho, respectivamente; e remoções de 91,5% e 85,2% de DQO para a amostra pré-tratada por CF e amostra bruta da Muribeca, respectivamente. Comparando esses resultados, decidiu-se pela não realização de um tratamento preliminar visto que o percentual de remoção entre as amostras pré-tratadas e brutas foram relativamente próximos, evitando assim o gasto extra de energia, materiais e tempo. Um planejamento fatorial 33 foi realizado para o tratamento por foto-Fenton para cada amostra de lixiviado dos aterros, variando-se concentração de H2O2, proporção de FeSO4.7H2O:H2O2 e pH, em um tempo reacional de 240 minutos sob radiação solar. Foram obtidos resultados de percentuais de remoções nas faixas de 52,5% a 87% de DQO, 43,5 a 77% de carbono orgânico total (COT) e 39 a 74% de substâncias húmicas (SH) para o lixiviado de Altinho; e 53 a 91% de DQO, 38,5 a 77% de COT e 30 a 64% de SH para o lixiviado da Muribeca. O estudo estatístico de correlação entre pares dessas variáveis mostrou que essas possuem correlação de moderada a altamente forte. Os dados experimentais se ajustaram a um modelo cinético de primeira ordem, alcançando-se 70% de degradação do COT dos dois lixiviados em 30 minutos de reação. Obteve-se a constante cinética (k) igual a 0,0408 min-1 e coeficiente de regressão linear (R2) igual a 0,9862 para o lixiviado de Altinho e k = 0,0373 min-1 e R2 = 0,9727 para Muribeca. A caracterização do lixiviado de Altinho e da Muribeca tratados, em suas condições ótimas, indicou um aumento da biodegradabilidade e uma remoção eficiente da carga orgânica, cor e turbidez. Os lixiviados tratados com diluição 1:10 não apresentaram toxicidade.
This research was motivated by the challenge to propose a treatment in laboratory scale to efficiently degrade pollutants of leachate from the landfill of Altinho - PE, located in the arid zone of the state and in operation, and landfill of Muribeca - PE, located in Metropolitan Region of Recife and closed since 2009. Thus, based on the high organic loading characteristic but low biodegradability of the leachates, a physical-chemical treatment with application of coagulation/flocculation (CF) and advanced oxidative (photo-Fenton) processes were made. Initially, a preliminary treatment of the leachate was done by an experimental design 24 using as independents variables: mass of the calcium hydroxide coagulant, flocculation time, flocculation rotation speed and settling time. Then, the photo-Fenton process was applied, under the same conditions, to the supernatant from the pretreated samples and directly to the raw samples. The results showed 89.6% and 83.4% COD removal for the pretreated sample by CF and raw sample from Altinho, respectively; and 91.5% and 85.2% COD removal for the pretreated sample by CF and raw sample from Muribeca, respectively. Comparing these results, it was decide not to do a pretreatment since the removal percentage between pretreated and raw samples were relatively close, avoiding the extra expense of energy, materials and time. A 33 factorial design was done for the photo-Fenton treatment to each landfills leachate sample, ranging the concentration of H2O2, the proportion of FeSO4.7H2O:H2O2 and pH, at a reaction time of 240 minutes under solar radiation. Percentages of removal results were obtained in the ranges of 52.5% to 87% of COD, 43.5 to 77% of TOC and 39 to 74% of humic substances (HS) to the Altinho’s leachate; and 53 to 91% of COD, 38.5 to 77% of TOC and 30 to 64% of HS to the Muribeca’s leachate. The statistical correlation study between pairs of these variables showed that it has a moderate to highly strong correlation. The experimental data fitted to a first order kinetic model, achieving 70% of TOC degradation for the leachate samples at 30 minutes of reaction. The rate constant (k) was 0.0408 min-1 and the linear regression coefficient (R2) was 0.9862 for Altinho´s leachate and k = 0.0373 min-1 and R2 = 0.9727 for Muribeca’s leachate. The characterization of Altinho and Muribeca treated leachate in its optimal condition, indicated an increase in biodegradability and efficient removal of organic matter, color and turbidity. The both treated leachate samples with dilution 1:10 showed no toxicity.
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Cardeña, Úrsula María Juárez. "Tratamento de efluentes aquosos contendo clorofenóis por meio de processo oxidativo avançado foto-Fenton." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-05062009-103425/.
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Nos últimos anos, os processos oxidativos avançados (POAs) têm emergido como métodos potencialmente poderosos para transformar poluentes orgânicos recalcitrantes em substâncias menos tóxicas. O presente trabalho visa estudar a degradação de clorofenóis 2,4-diclorofenol (2,4-DCF) e pentaclorofenol (PCF) em solução aquosa por meio do processo foto-Fenton. Os experimentos foram realizados em um reator fotoquímico, em regime batelada, com recirculação e admissão contínua de peróxido de hidrogênio. Os efeitos das concentrações iniciais de clorofenóis, H2O2 e Fe(II), bem como, da potência da lâmpada de vapor de mercúrio, foram estudados a partir de um planejamento experimental Doehlert em multiplos níveis e analisados segundo a metodologia de superfícies de respostas. A foto-oxidação foi monitorada por medidas da concentração de carbono orgânico total (TOC) e do espectro de absorção da solução ao longo do tempo e, em alguns casos, medidas de toxicidade por meio de bioensaios com Artemia sp. Os resultados dos experimentos realizados com 2,4-DCF evidenciaram degradação gradativa, com remoções de TOC superiores a 99%, após 1 hora de tratamento, além de remoção de toxicidade, mesmo para altas concentrações iniciais do poluente (até ca. 415 mgC L-1). Nos experimentos realizados com PCF observouse decaimento inicial de TOC bastante rápido (15 minutos), o que sugere que a degradação dos clorofenóis torna-se mais rápida com o aumento do número de átomos de cloro ligados ao anel aromático. Foi removida mais da metade do TOC inicial por volta de 30 minutos de reação, obtendo-se remoções de até 90,8% ao final do tratamento. Por outro lado, comparado ao 2,4-DCF, no caso do PCF observou-se redução acentuada da taxa de remoção de TOC após esse tempo, o que pode ser explicado a partir da maior concentração de íons cloreto em solução, da formação de complexo estável desses íons com Fe(III) e de espécies geradas a partir de reações envolvendo esse complexo. No conjunto, os resultados comprovam a viabilidade do processo foto-Fenton para remediação de efluentes aquosos contendo clorofenóis.In recent years, advanced oxidation processes (AOP) have emerged as potentially powerful methods to transforming organic pollutants into harmless substances. The present work aims to study the degradation of chlorophenols (2,4-dichlorophenol and pentachlorophenol) in aqueous solution by the photo-Fenton process. The experiments were conducted in a batch recycle photochemical reactor with continuous feed of hydrogen peroxide solution. The effects of the initial concentrations of chlorophenols, H2O2, and Fe(II), as well as of the electric power of mercury vapor lamp, were studied by means of a Doehlert multivariate experimental design at multiple levels. Experimental results were analyzed according to the response surface methodology. In order to characterize the degradation of the pollutant, time-measurements of the total organic carbon concentration (TOC) as well as the absorbance spectra of the solution, were carried out. In some cases toxicity bioassays were carried out with Artemia sp. The results obtained from experiments with 2,4-dichlorophenol showed a gradual degradation, with more than 99% of TOC removals after 1 hour of treatment, along with toxicity removal, even for high initial pollutant concentrations (ca. 415 mgC L-1). In the case of pentachlorophenol, a fast initial TOC decrease (around 15 minutes) was observed, suggesting that chlorophenols degradation becomes faster with the increment of chloro atoms number bounded to the aromatic ring. More than a half of the initial TOC was removed around 30 minutes of reaction, rising 90.8% of TOC removal at the end of the treatment. In the other hand, comparing to 2,4-DCF, for PCF a marked reduction of the maximum rate of TOC removal after that time. This can be explained by higher concentrations of chloride ions in the solution, for the formation of stable complexes with Fe(III) ion and resulting species in reaction involving such complexes. As a whole, the results confirm the effectiveness of the photo-Fenton process for the remediation of aqueous solutions containing chlorophenols.
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Coralli, Irene. "Analysis of chemical degradation of caffeine in aqueous solution using an advanced oxidation process: Fenton's reagent and UV radiation." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019. http://amslaurea.unibo.it/17964/.
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The present study is aimed to analyse the degradation of caffeine in water employing an advanced oxidation process, the photo-Fenton reaction (H2O2/Fe2+/UV). Different concentrations of H2O2 and Fe2+ are used to evaluate the effects of the two reagents on the quality of the water after the reaction and on the kinetics of degradation. The quality of the water is estimated in terms of conductivity, turbidity, colour and aromaticity. These quantities were found to be not dependent on H2O2 concentrations, whereas the Fe2+ concentration affects them in a proportional way. Compared to the limits of European Directives, the resulting conductivity is acceptable. Turbidity and colour exceed the limits, and the observed influence of the catalyst suggests that they are due to iron species, not to reaction products. Finally, the method employed to evaluate the aromaticity, based on absorbance at 254 nm, does not seem to be reliable. The kinetics of degradation are elaborated through measurements of the absorbance at 272 nm as a function of time. The dependence of the reaction rate on H2O2 concentration observed here is small, but even the lowest concentration employed is 16 times larger than that of caffeine. When the H2O2 concentration is kept constant, a nearly direct proportionality results between reaction rates and Fe2+ doses. Further analyses have shown that caffeine can also be degraded only under UV-visible irradiation (no reagents), but the reaction would need a very long time (6% in 45 minutes). With the addition of Fe2+ (without H2O2) the reaction rate was found somewhat higher, while with the addition of only H2O2 (without Fe2+) the photo-degradation rate was found to be 2/3 of that measured using both reagents. Therefore, the Fe2+ catalyst contributes to the degradation, but dissociation of the perossidic O-O bond of H2O2 to give OH• radicals can also be directly caused by UV irradiation.
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Pontes, Ricardo de Freitas Fernandes. "Modelagem e síntese ótima de rede de reatores de processos oxidativos avançados para o tratamento de efluentes." Universidade de São Paulo, 2009. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-18122009-131117/.
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Substâncias tóxicas como o fenol e outros compostos aromáticos dificultam o tratamento de efluentes via digestores biológicos. Estes compostos tóxicos em altas concentrações são nocivos aos lodos biológicos, podendo inviabilizar por completo o tratamento. Nas últimas décadas, os Processos Oxidativos Avançados (POAs), como os processos Fenton e foto- Fenton, surgiram como alternativa para o tratamento de compostos tóxicos. Os POAs degradam os compostos orgânicos pela geração de compostos oxidantes fortes, como o radical hidroxila, a partir de reagentes como peróxido de hidrogênio. Os processos Fenton e foto-Fenton fazem uso de ferro (II), um catalisador relativamente barato, para catalisar a decomposição do peróxido de hidrogênio, reação denominada como reação de Fenton. Em virtude dos complexos mecanismos presentes nos processos Fenton e foto-Fenton, torna-se necessária uma compreensão da cinética do processo, que envolve reações térmicas e fotoquímicas, por meio de sua modelagem matemática fenomenológica. A modelagem da degradação do fenol via processos Fenton e foto-Fenton proposta por este trabalho começa pela estequiometria dos dois processos, que descreve as reações químicas, térmicas e fotoquímicas existentes. A partir destas, é possível desenvolver o modelo cinético dos processos Fenton e foto-Fenton, no qual se determina a velocidade com que estas reações ocorrem. O passo seguinte é o da modelagem hidráulica (ou de escoamento) dos reatores de processo Fenton e foto-Fenton, sendo que para o segundo processo, o modelo deve levar em conta a propagação da radiação por dentro de reator. Foram realizados 3 experimentos de degradação de fenol via processo Fenton para análise das variações das concentrações de fenol, catecol e hidroquinona. Os dados experimentais são comparados com resultados simulados com intuito do ajuste das constantes cinéticas do modelo. Com as constantes ajustadas, são realizadas comparações entre os processos Fenton e foto-Fenton para análise de suas eficiências. A partir dos modelos matemáticos dos reatores de processos Fenton e foto-Fenton, é desenvolvido um modelo de otimização baseado em superestrutura de redes de reatores para a síntese de uma planta de tratamento de efluentes contaminados com fenol. Objetivou-se a redução dos custos de capital, operação e depreciação desta planta, sujeitos às restrições de projeto e ao modelo da superestrutura, resultando em modelos de programação não-linear inteira mista. Foram geradas soluções ótimas para o tratamento de efluentes contaminados com fenol em redes de um, dois e três reatores de POAs.Toxic substances such as phenol and other aromatic compounds make the wastewater treatment by biological (aerobic or anaerobic) digestors more difficult. These toxic compounds in high concentrations are harmful for the biological sludge and they may render the treatment impractical. In recent decades, Advanced Oxidative Processes (AOPs) appeared as an alternative for the treatment of toxic compounds. AOPs degrade the organic compounds by generating strong oxidizing compounds, such as the hydroxyl radical, from reactants such as hydrogen peroxide. The Fenton and photo-Fenton processes make use of iron (II), a relatively inexpensive catalyst, to catalyze the hydrogen peroxide decomposition, reaction known as the Fenton reaction. Because of the complex nature of the mechanisms that take place in the Fenton and photo-Fenton processes, the understanding of the process kinetics, which involves thermal and photochemical reactions, becomes necessary through its first-principle mathematical modeling. The modeling of phenol degradation by the Fenton and photo-Fenton processes proposed in this work starts with the stoichiometry of the two processes that enumerates the existing thermal and photochemical reactions. Furthermore, it is possible to develop the Fenton and photo- Fenton kinetic model, which determines the reaction rates. The next step is to model the hydraulic (or flow) behavior of the Fenton and photo-Fenton process reactor, whereas the model for the latter must consider how the radiation propagates inside the reactor. Three experiments of the phenol degradation by the Fenton process were carried out to analyze the concentration variation for phenol, catechol and hydroquinone. The experimental data are compared with simulated results aiming the estimation of the kinetic constants of the model. Using the adjusted constants, the Fenton and photo-Fenton processes were compared to analyze their efficiencies. From the mathematical models of the Fenton and photo-Fenton process reactors, an optimization model based on reactor network superstructure is developed for the synthesis of a phenol contaminated wastewater treatment plant. The objective is to minimize the plant capital, operation and depreciation costs, subject to design constraints and to the superstructure model, thus resulting in mixed integer nonlinear programming models. Optimal solutions were generated for the phenol contaminated wastewater treatment in networks with one, two and three AOP reactors.
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Resende, Juliana Dalia. "Degradação de 2,4-diclorofenol em solução aquosa por meio de processo fotoquímico solar." Universidade de São Paulo, 2011. http://www.teses.usp.br/teses/disponiveis/3/3137/tde-31052011-161350/.
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O 2,4-diclorofenol (2,4-DCF), poluente modelo usado neste trabalho, é um composto empregado na produção de pesticidas, herbicidas e anti-sépticos, e comumente encontrado em efluentes industriais, sendo considerado um poluente prioritário devido a sua elevada toxicidade e alto poder de persistência no ambiente. Este trabalho objetivou estudar a degradação do 2,4-DCF em reator fotoquímico tubular com coletores parabólicos compostos (CPC) irradiado pelo Sol, operado em batelada com recirculação e admissão contínua de peróxido de hidrogênio à vazão de 11 mL min-1. A oxidação do poluente foi baseada no processo foto-Fenton catalisado por tris(oxalato) ferrato(III) (FeOx), investigando-se os efeitos das seguintes variáveis: concentração inicial de 2,4-DCF ([2,4-DCF] = 21-520 mgCL-1), concentrações de oxidante ([H2O2] = 9,9-130 Mm) e de fotocatalisador ([FeOx] = 0,2-1,8 mM) e área de coleta de fótons (0,196-0,98 m2), estudadas a partir de um planejamento Doehlert em múltiplos níveis. A foto-oxidação foi monitorada por medidas da concentração de carbono orgânico total (TOC) e oxigênio dissolvido (OD), tendo sido identificadas condições com remoção de TOC alcançando 99,8% em 90 minutos de tratamento. Nas análises estatísticas dos resultados, os efeitos da área de coleta de fótons e da concentração de H2O2 concordaram com o comportamento esperado, sugerindo, porém, efeitos sequestradores de radicais hidroxila quando a concentração de H2O2 é alta. A partir dos dados experimentais, obteve-se um modelo de redes neurais, usado para previsão da taxa de remoção de TOC em função do tempo. Através do método HIPR (Holdback Input Randomization Method) e dos pesos associados a cada variável de entrada da rede neural, avaliou-se a importância relativa das variáveis de entrada. De maneira geral, os resultados comprovaram a viabilidade do processo foto-Fenton catalisado por tris(oxalato) ferrato III e irradiado pelo Sol para o tratamento de efluentes aquosos contendo 2,4-diclorofenol.2,4-dichlorophenol (2,4-DCF), the model pollutant selected in this work, is a compound used in the production of pesticides, herbicides, antiseptics, and commonly found in industrial wastewaters. It is considered a priority pollutant due to its high toxicity and high persistence in the environment. This study investigated the degradation of 2,4-DCF in a tubular photochemical reactor with compound parabolic collectors (CPC) irradiated by the sun, operated in batch with recirculation and continuous feed of hydrogen peroxide at a flow rate of 11 mL min-1. The oxidation of the pollutant was based on the photo-Fenton process catalyzed by tris (oxalate) ferrate (III) (FeOx). The effects of the following variables were investigated: initial concentration of 2,4-DCF ([2,4-DCF] = 21-520 mgCL-1), concentrations of oxidant ([H2O2] = 9,9-130 Mm)); photocatalyst ([FeOx]= 0,2-1,8 mM)), and photon collection surface (0,196-0,98 m2), according to a Doehlert design on multiple levels. The photo-oxidation was monitored by measurements of the concentration of total organic carbon (TOC) and dissolved oxygen (OD). Conditions with TOC removal achieving 99.8% within 90 minutes of treatment were identified. The statistical analysis of the results showed that the effects of photon collection area and the concentration of H2O2 agreed with the expected behavior, but suggests scavenging effects of hydroxyl radicals when the concentration of H2O2 is high. From the experimental data, a model of neural networks was obtained and used to predict the rate of TOC removal with time. Using the method HIPR (Holdback Input Randomization Method) and the weights associated with each input variable to the neural network, the relative importance of input variables was determined. Overall, the results proved the feasibility of photo-Fenton process catalyzed by tris(oxalate) ferrate III and irradiated by the sun, for the treatment of aqueous effluents containing 2,4-dichlorophenol.
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Hammami, Samiha. "Étude de dégradation des colorants de textile par les procédés d'oxydation avancée : application à la dépollution des rejets industriels." Phd thesis, Université de Marne la Vallée, 2008. http://tel.archives-ouvertes.fr/tel-00740155.
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Cette étude porte sur l'application de différents procédés d'oxydation avancée, POA (plasma d'air humide, électro-Fenton, photo-Fenton et oxydation anodique avec BDD) pour le traitement des colorants de textile. La particularité de ces procédés tient à la génération dans le milieu d'entités très réactives et très oxydantes, les radicaux hydroxyles *OH qui sont capables d'oxyder n'importe quelle molécule organique jusqu'au stade ultime d'oxydation, c'est-à-dire la minéralisation (transformation en CO2 et H2O). Le plasma d'air humide a été appliqué pour l'oxydation d'un colorant azoïque, l'OD 61. Différents catalyseurs (Fe2+, Fe3+ et TiO2) ont été ajoutés dans leurs conditions optimisées afin d'améliorer les performances du système Glidarc. La combinaison des deux catalyseurs: Fe2+ et TiO2 a permis de décolorer 91% de l'OD 61 au bout de 3 heures et d'atteindre un taux d'abattement du COT de l'ordre de 52% après 10 heures de traitement. La méthodologie de la recherche expérimentale a été appliquée dans ce mémoire afin d'étudier l'influence de: l'intensité du courant, la concentration du colorant et le temps d'électrolyse sur la vitesse de disparition de l'OD 61 et afin de déterminer les conditions optimales de sa minéralisation. Dans les conditions optimales obtenues ([colorant] = 0,53.10-3 mol.L-1, I = 250 mA), le procédé électro-Fenton (EF) permet d'atteindre des taux de minéralisation de l'ordre de 98% dans le cas de l'OD 61 et l'AO 7 et de 88% dans le cas de l'indigo carmine. L'identification des produits intermédiaires au cours de l'électrolyse a permis de proposer un mécanisme de minéralisation de l'AO7. Les constantes cinétiques apparentes et absolues ont été déterminées. La dégradation de l'indigo a été étudiée par oxydation anodique avec BDD (OA-BDD) et par procédé photo-Fenton (PF). Cette étude a montré que l'électrolyse de l'indigo suit une cinétique de pseudo premier ordre et que le taux d'abattement du COT était de l'ordre de 97% et 63% respectivement avec OA-BDD et PF. Une étude comparative pour l'oxydation de l'AO 7 a été menée par trois procédés d'oxydation avancée: PF, OA- BDD et EF-Pt et EF-BDD. Cette étude a montré que le procédé photo-Fenton permet d'atteindre des taux d'abattement supérieurs à 90% après seulement 2 heures de traitement. Toutefois, le PF s'est révélé le plus coûteux suite à l'utilisation de la lumière artificielle UV et l'ajout des réactifs. Par ailleurs, le traitement d'un effluent réel issu de l'industrie de textile par le procédé électro-Fenton avec une anode de platine a permis la minéralisation presque totale du rejet initial (94% du COT initial ont été éliminés).
Book chapters on the topic "Photo–Fenton process"
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García Einschlag, Fernando S., André M. Braun, and Esther Oliveros. "Fundamentals and Applications of the Photo-Fenton Process to Water Treatment." In Environmental Photochemistry Part III, 301–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/698_2013_247.
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Dutta, Amrita, Sanjukta Datta, Mahua Ghosh, Debasish Sarkar, and Sampa Chakrabarti. "Sunlight-Assisted Photo-Fenton Process for Removal of Insecticide from Agricultural Wastewater." In Trends in Asian Water Environmental Science and Technology, 23–33. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39259-2_2.
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Moumni, Chamirane, Nadim Fakhfakh, Haithem Bel Hadjltaief, and Mourad Benzina. "Response Surface Methodology Optimization of Heterogeneous Catalyst Fe2O3-Zeolite Synthesis for the Discoloration of Indigo Carmine Dye by Photo-Fenton Process." In Recent Advances in Environmental Science from the Euro-Mediterranean and Surrounding Regions, 1109–11. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-70548-4_321.
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Sakhalkar, V., A. Khandare, M. P. Deosarkar, and S. P. Kamble. "Photocatalytic Degradation of Herbicide by Using Aeroxide®P-90 TiO2 Photocatalyst and Photo-Fenton Process in the Presence of Artificial and Solar Radiation." In Novel Water Treatment and Separation Methods, 3–17. Toronto ; Waretown, NJ : Apple Academic Press, 2017. | "Outcome of national conference REACT- 16, organized by the Laxminarayan Institute of Technology, Nagpur, Maharashtr , India, in 2016"--Introduction. || Includes bibliographical references and index.: Apple Academic Press, 2017. http://dx.doi.org/10.1201/9781315225395-1.
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Affam, Augustine Chioma, and Malay Chaudhuri. "Comparative Study of Advance Oxidation Processes for Treatment of Pesticide Wastewater." In Advances in Environmental Engineering and Green Technologies, 261–323. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5766-1.ch011.
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This study compared the amount of catalyst and energy efficiency required for operation of five advanced oxidation processes (Fenton, UV photo-Fenton, solar photo-Fenton, UV/TiO2/H2O2, and FeGAC/H2O2) for degradation of the pesticides chlorpyrifos cypermethrin and chlorothalonil wastewater. Under optimum operating conditions, degradation in terms of COD and TOC removal and biodegradability (BOD5/COD ratio) index (BI) were observed to be (1) Fenton – 69.03% (COD), 55.61% (TOC), and 0.35 (BI); (2) UV photo-Fenton – 78.56% (COD), 63.76% (TOC), and 0.38 (BI); (3) solar photo-Fenton – 74.19% (COD), 58.32% (TOC), and 0.36 (BI); (4) UV/TiO2/H2O2 – 53.62% (COD), 21.54% (TOC), and 0.26 (BI); and (5) FeGAC/H2O2 – 96.19% (COD), 85.60% (TOC), and 0.40 (BI). The cost was $39.9/kg TOC (Fenton), $34.1/kg TOC (UV photo-Fenton), $30.1/kg TOC (solar photo-Fenton), $239/kg TOC (UV/TiO2/H2O2), and $0.74/kg TOC (FeGAC/H2O2). The FeGAC/H2O2 process was found to be most efficient and cost effective for pretreatment of the pesticide wastewater for biological treatment.
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Wang, X., L. Zang, and D. Ji. "Photo-Electro-Fenton process for wastewater treatment." In Material Science and Environmental Engineering, 681–83. CRC Press, 2015. http://dx.doi.org/10.1201/b19346-143.
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Tri Wahyuni, Endang. "Photo-Processes as Effective and Low-Cost Methods for Laundry Wastewater Treatment." In Wastewater Treatment [Working Title]. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.94336.
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In this chapter, surfactants as cleansing agent in detergent used in laundry, are described. The negative effects of the laundry wastewater on the environment and human health are highlighted. Several methods examined for laundry wastewater treatment are also illustrated. Among the treatment methods, photo-process in the presence of TiO2 photocatalyst and Fenton reagents are described in more detail. Furthermore, the factors influencing the effectiveness of photo-process including reagent dose, reaction time, and pH are discussed. Additionally, modifications of the photo-process to improve its performance that is associated with effectiveness and operational cost are also demonstrated. The photo-methods discussed in this chapter offered low-cost due to simplicity and effective technique for treating the laundry wastewater.
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Rajasekaran, Rajesh Nithyanandam, Hastheesudabye Puddoo, and Thaothy Nithyanandam Nguyenhuynh. "An Overview of Treatment of Antibiotics Using Advanced Oxidation Process." In Advances in Environmental Engineering and Green Technologies, 226–60. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-5766-1.ch010.
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Antibiotics present in the environment are originated from pharmaceutical manufacturing processes or through wastes such as urine and feces. As antibiotics remain recalcitrant and persist in the treated water, consumption of treated water containing antibiotics raises a concern in the development of antibiotic resistance bacteria which would be later released to the environment. It might result in a vicious cycle which new antibiotics needs to be developed and dosage has to increase. Advanced oxidation processes (AOP) have been studied to effectively degrade antibiotics. During this process, hydroxyl radicals are formed to degrade organic compounds. Different APO are available in the literature such as photo-Fenton, Fenton, ozonation, sonolysis (UV), ultrasound combined with ozone, TiO2/direct photolysis, UV/H2O2, UV/ TiO2, UV/IGBT. To treat the high level of concentration of antibiotics, retention time of AOPs needs to be extended or/and OH• radicals need to be produced in a higher concentration for a complete mineralization.
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Audino, Francesca, Mónika Varga, Montserrat Pérez-Moya, Moisès Graells, Antonio Espuña, and Béla Csukás. "Experiments and Direct Computer Mapping Based Model for Photo-Fenton Process." In Computer Aided Chemical Engineering, 223–28. Elsevier, 2018. http://dx.doi.org/10.1016/b978-0-444-64235-6.50040-1.
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Monroy, I., E. Yamal, G. Escudero, M. Pérez-Moya, and M. Graells. "A novelty detection approach for detecting faulty batches in a photo-Fenton process." In Computer Aided Chemical Engineering, 972–76. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-59520-1.50053-1.
Full textConference papers on the topic "Photo–Fenton process"
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Xiangwei, Yu, Moisès Graells, Sara Miralles-Cuevas, Alejandro Cabrera-Reina, and Montserrat Pérez-Moya. "Improving photo-Fenton process by hydrogen peroxide dosage strategies. Dissolved oxygen performance indicator." In 14th Mediterranean Congress of Chemical Engineering (MeCCE14). Grupo Pacífico, 2020. http://dx.doi.org/10.48158/mecce-14.dg.09.15.
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Wanchai, Katnanipa, and Rattiya Pichon. "Synthesis of Fe3O4@chitosan beads for degradation of sulfanilamide using photo-fenton process." In THE SECOND MATERIALS RESEARCH SOCIETY OF THAILAND INTERNATIONAL CONFERENCE. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0024113.
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Świderska-Dąbrowska, R., K. Piaskowski, and R. Schmidt. "Oxidation of organic pollutants in photo-Fenton process in presence of humic substances." In The Fifth National Congress of Environmental Engineering. Taylor & Francis Group, 6000 Broken Sound Parkway NW, Suite 300, Boca Raton, FL 33487-2742: CRC Press, 2016. http://dx.doi.org/10.1201/9781315281971-27.
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Amri, Nurulhuda, Norhaslinda Nasuha, Siti Fatimah Abdul Halim, and Khairuddin Ngah. "Degradation of Reactive Black 5 dye by CWPO using Fe/mining sand under photo-Fenton process." In INTERNATIONAL CONFERENCE ON MATHEMATICS, ENGINEERING AND INDUSTRIAL APPLICATIONS 2014 (ICoMEIA 2014). AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4915811.
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SOUZA, B. M., M. W. C. DEZOTTI, R. A. R. BOAVENTURA, and V. J. P. VILAR. "INSIGHTS INTO DICLOFENAC REMOVAL USING A SOLAR PHOTO-FENTON PROCESS MEDIATED BY FERRIOXALATE AT NEAR NEUTRAL PH." In XX Congresso Brasileiro de Engenharia Química. São Paulo: Editora Edgard Blücher, 2015. http://dx.doi.org/10.5151/chemeng-cobeq2014-1811-17426-143612.
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CANTELI, A. M. D., D. CARPINE, G. DONÁ, T. A. TAKASHINA, A. de P. SCHEER, and L. IGARASHI-MAFRA. "PHOTO-FENTON AND ADSORPTION COMBINED PROCESS FOR DEGRADATION AND REMOVING OF COOMASSIE BRILLIANT BLUE DYE FROM AQUEOUS SOLUTION." In XX Congresso Brasileiro de Engenharia Química. São Paulo: Editora Edgard Blücher, 2015. http://dx.doi.org/10.5151/chemeng-cobeq2014-0611-24728-147356.
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López Vinent, Núria, Alberto Cruz Alcalde, Jaime Giménez, Pilar Marco, Bernardí Bayarri Ferrer, Santiago Esplugas, and Carme Sans. "New insights in photo-Fenton process at neutral pH: organic fertilizer as an iron complex for agricultural irrigation reuse." In 14th Mediterranean Congress of Chemical Engineering (MeCCE14). Grupo Pacífico, 2020. http://dx.doi.org/10.48158/mecce-14.dg.09.12.
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PEREIRA, J. H. O. S., D. B. QUEIRÓS, A. C. REIS, O. C. NUNES, M. T. BORGES, R. A. R. BOAVENTURA, and V. J. P. VILAR. "PROCESS INTENSIFICATION AT NEAR NEUTRAL pH OF A HOMOGENOUS PHOTO-FENTON REACTION USING FERRICARBOXYLATE COMPLEXES: APPLICATION TO OXYTETRACYCLINE DEGRADATION." In XX Congresso Brasileiro de Engenharia Química. São Paulo: Editora Edgard Blücher, 2015. http://dx.doi.org/10.5151/chemeng-cobeq2014-1984-16544-146795.
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Jacobs, A., and W. Everett. "A Fully Operational Pilot Plant for Eliminating Radioactive Oils Mixed With Chlorinated Solvents." In ASME 2011 14th International Conference on Environmental Remediation and Radioactive Waste Management. ASMEDC, 2011. http://dx.doi.org/10.1115/icem2011-59044.
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Disposal of organic liquid waste has become an increasing issue for many nuclear sites. Existing disposal solutions such as incineration or super critical water techniques are not compatible with wastes containing chlorinated solvents or fluorine owing to corrosion problems. As an example several hundred cubic meters of lubricating oils mixed with trichloroethylene (TCE) or perchloroethylene (PCE) are stockpiled on several French nuclear sites. For several years Dewdrops has been developing an original combination of mineralization processes for waste oils and solvents particularly well suited to the nuclear field. The patented technology relies on the alternation of chemical and biological oxidation mechanisms. The oxidized organic material predominately forms carbon dioxide, water and inorganic salts. This paper details the procedure and the results obtained for a particular case at the Tricastin nuclear site of Areva NC (South France). The organic waste used in this study was a 85/15 v/v ratio mix of lubricating oil and TCE. The pilot plant build upon the technology has a daily treatment capacity of approximately 10 liters. In the first step the TCE is mineralized by the photo Fenton reaction. Using hydrogen peroxide with an ultraviolet regenerated iron catalyst, TCE is transformed to carbon dioxide, water and hydrochloric acid. After neutralizing with caustic soda, the next step is a multi-stage biodegradation process to eliminate the remaining lubricating oil. Carefully selected microorganisms use the organic waste as an energy source for their metabolism. During oil biodegradation over 75% of the carbon is released as carbon dioxide while the remaining is incorporated into the biomass. The aqueous phase is continuously separated from the biomass using cross flow filters. The output aqueous phase is treated with ozone and ultraviolet light to eliminate the remaining organic compounds. The final effluent obtained is in conformance with European water standards and can be disposed by normal means. It can also be adjusted to local requirements. The radioactive elements and heavy metals present in these lubricating oils are trapped by the biomass. The excess of biomass is recovered by centrifugation and mineralized by catalytic ozonation technology. The result of the tests was a radioactive waste reduction factor of 15. The mineral residue is a concentrate of inorganic salts with traces of radioactive elements as well as heavy metals. The radioactive elements thus recovered can be consigned to an official repository.