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Electro–oxidation of industrial wastewater containing 1,4-dioxane in the presence of different salts Barndok, Helen Hermosilla Redondo, María Daphne Cortijo, Luis Torres, Esperanza Blanco Suárez, María Ángeles 628.3 66.0 Electro-oxidation 1 4-dioxane Boron doped diamond Biodegradability Pseudomonas putida Central composite Agua Ingeniería química Química industrial Residuos 2303.31 Química del Agua 3303 Ingeniería y Tecnología Químicas The treatment of 1,4-dioxane solution by electrochemical oxidation on boron-doped diamond was studied using a central composite design and the response surface methodology to investigate the use of SO42- and HCO3- as supporting electrolytes considering the applied electric current, initial COD value, and treatment time. Two industrial effluents containing bicarbonate alkalinity, one just carrying 1,4-dioxane (S1), and another one including 1,4-dioxane and 2-methyl-1,3-dioxolane (S2), were treated under optimized conditions, and subsequently subjected to biodegradability assays with Pseudomonas putida culture. Electro-oxidation was compared with ozone oxidation (O3) and its combination with hydrogen peroxide (O3/H2O2). Regarding the experimental design, the optimal compromise for maximum COD removal at minimum energy consumption was shown at the maximum tested concentrations of SO42- and HCO3- (41.6 and 32.8 mEq•L-1, respectively), and the maximum selected initial COD (750 mg•L-1), applying a current density of 11.9 mA•cm-2 for 3.8 hours. Up to a 98% of the COD was removed in the electro–oxidation treatment of S1 effluent using 114 kWh per kg of removed COD; and about a 91% of the COD from S2 wastewater applying 49 kWh per kg of removed COD. The optimal biodegradability enhancement was achieved after 1 h of electro-oxidation treatment. In comparison with O3 and O3/H2O2 alternatives, electrochemical oxidation achieved the fastest degradation rate per oxidant consumption unit; as well as it also resulted to be the most economical treatment in terms of kWh consumption and price per unit of removed COD. European Commission Archimedes Foundation (Estonia) Depto. de Ingeniería Química y de Materiales Fac. de Ciencias Químicas TRUE pub 2023-06-19T13:30:58Z 2023-06-19T13:30:58Z 2014 journal article https://hdl.handle.net/20.500.14352/33914 0944-1344 10.1007/s11356-013-2483-2 1614-7499 eng AM AQUAFIT4USE (211534) Barndõk, H., et al. «Electrooxidation of Industrial Wastewater Containing 1,4-Dioxane in the Presence of Different Salts». Environmental Science and Pollution Research, vol. 21, n.o 8, abril de 2014, pp. 5701-12. DOI.org (Crossref), https://doi.org/10.1007/s11356-013-2483-2. open access application/pdf Springer