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Olmez-Hanci, Tugba,Imren, Ceren,Arslan-Alaton, Idil,Kabdasli, Isik,Tunay, Olcay Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.5
This paper discusses the feasibility of the ultraviolet radiation-hydrogen peroxide ($H_2O_2$/UV-C) process as an advanced oxidation process (AOP) in the treatment of endocrine disrupting compounds (EDC). Dimethyl phthalate (DMP) was chosen as the model compound owing to its classification as an EDC. Experiments have been conducted at various pH values (3.5, 6.0 and 9.0) and initial $H_2O_2$ concentrations (0-60 mM) in a batch reactor equipped with a low-pressure mercury UV-C lamp in order to evaluate the optimal operation conditions of the $H_2O_2$/UV-C process. The most effective pH value for the degradation of DMP by $H_2O_2$/UV-C treatment was found as 6.0. DMP abatement increased with increasing $H_2O_2$ concentrations from 5 to 30 mM. Further increase in initial $H_2O_2$ concentration, however, reduced both the rate and extent of DMP removal as well as chemical oxygen demand (COD) and total organic carbon (TOC) removals. A simple kinetic model was proposed for DMP, COD and TOC abatements confirmed pseudo-first-order reaction. The electrical energy per order (EE/O) values for DMP oxidation and TOC mineralization were calculated as 3.3 and $19\;kWh\;m^{-3}\;order^{-1}$ respectively for the optimum treatment conditions ($H_2O_{2,o}$ = 30 mM, $pH_o$ = 6.0, $DMP_{o}\;=\;100\;mg\;L^{-1}$). Inhibition of oxygen uptake rate by activated sludge (ISO 8192) was evaluated as a tool for assessing the acute toxicity of untreated and $H_2O_2$/UV-C treated DMP. According to the results obtained in this work, the use of the $H_2O_2$/UV-C process is recommended to achieve a complete DMP oxidation and high mineralization degree of aqueous solution of DMP.
Arslan-Alaton, Idil,Tureli, Gokce,Olmez-Hanci, Tugba Korean Society of Photoscience 2009 Photochemical & photobiological sciences Vol.8 No.5
Treatability of synthetic Acid Blue 193 and Reactive Black 39 production wastewaters and real Reactive Black 39 production effluent via photo-Fenton-like process was investigated. The Central Composite Design technique was used to study the effect of some critical process parameters of the photo-Fenton process (e.g. reaction time, initial COD and $Fe^{3+}$ : $H_2O_2$ molar ratio) on synthetic Acid Blue 193 production wastewater treatment efficiency in terms of color, chemical oxygen demand (COD) and total organic carbon (TOC) removals. Selected process parameters were optimized to obtain maximum color, COD and TOC removal efficiencies. Optimum working conditions were established as 45 min reaction time and a $Fe^{3+}$ : $H_2O_2$ molar ratio of 0.073 for wastewater having an initial COD ($COD_o$) of $200\;mg\;L^{-1}$. Under these conditions, 99% color, 83% COD and 58% TOC abatements were experimentally obtained. In case of real Reactive Black 39 production effluent, photo-Fenton-like treatment efficiency was found to be considerably lower than that of the synthetic acid and reactive dye production wastewaters, which was attributable to the relatively high chloride (i.e. a well known $^{\cdot}OH$ radical scavenger) content of the real effluent.