Cho, Kangwoo Qu, Yan Kwon, Daejung Zhang, Hao Cid, Clement A. Aryanfar, Asghar Hoffmann, Michael R. 2024-01-20T10:30:59Z 2024-01-20T10:30:59Z 2021-09-05 2014-02-18 0013-936X https://pubs.kist.re.kr/handle/201004/127083 We have investigated electrochemical treatment of real domestic wastewater coupled with simultaneous production of molecular H-2 as useful byproduct. The electrolysis cells employ multilayer semiconductor anodes with electroactive bismuth-doped TiO2 functionalities and stainless steel cathodes. DC-powered laboratory-scale electrolysis experiments were performed under static anodic potentials (+2.2 or +3.0 V NHE) using domestic wastewater samples, with added chloride ion in variable concentrations. Greater than 95% reductions in chemical oxygen demand (COD) and ammonium ion were achieved within 6 h. In addition, we experimentally determined a decreasing overall reactivity of reactive chlorine species toward COD with an increasing chloride ion concentration under chlorine radicals (Cl center dot, Cl-2(-)center dot) generation at +3.0 V NHE. The current efficiency for COD removal was 12% with the lowest specific energy consumption of 96 kWh kgCOD(-1) at the cell voltage of near 4 V in 50 mM chloride. The current efficiency and energy efficiency for H-2 generation were calculated to range from 34 to 84% and 14 to 26%, respectively. The hydrogen comprised 35 to 60% by volume of evolved gases. The efficacy of our electrolysis cell was further demonstrated by a 20 L prototype reactor totally powered by a photovoltaic (PV) panel, which was shown to eliminate COD and total coliform bacteria in less than 4 h of treatment. English American Chemical Society ORGANIC POLLUTANTS MOLECULAR-HYDROGEN ACTIVE CHLORINE OXIDATION ELECTROLYSIS DEGRADATION OXYGEN PERCHLORATE PERFORMANCE ELECTRODES Effects of Anodic Potential and Chloride Ion on Overall Reactivity in Electrochemical Reactors Designed for Solar-Powered Wastewater Treatment Article 10.1021/es404137u 1 Environmental Science & Technology, v.48, no.4, pp.2377 - 2384 Environmental Science & Technology 48 4 2377 2384 scie scopus 000331774100035 2-s2.0-84894237419 Engineering, Environmental Environmental Sciences Engineering Environmental Sciences & Ecology Article ORGANIC POLLUTANTS MOLECULAR-HYDROGEN ACTIVE CHLORINE OXIDATION ELECTROLYSIS DEGRADATION OXYGEN PERCHLORATE PERFORMANCE ELECTRODES