[Electrochemical oxidation of dual electrodes with iron promoting used for the treatment of wastewater from acrylonitrile production].
Effects and laws of electrochemical oxidation of dual electrodes with iron promoting for the treatment of wastewater from acrylonitrile production were investigated using Ti/SnO2 + Fe as combined anodes and graphite as cathode. Compared with traditional electrochemical oxidation, the higher removal of organic pollutants and current efficiency were obtained via oxidation of dual electrodes. Through the process COD removal efficiency and current efficiency were enhanced by 11.0%-13.8% and 8.0%-15.0% respectively, referred to the results from traditional electrochemical oxidation under conditions of the same voltage and no hydrogen peroxide added. With 2 200 mg x L(-1) hydrogen peroxide and voltage of 4.0 V, COD and TOC removal efficiencies increased to 74.6% and 67.9% respectively, and with the increase of hydrogen peroxide, both were enhanced obviously. During the initial reaction period, the higher hydrogen peroxide concentration and the lower Fe2+ concentration were detected, and with reaction time increased, hydrogen peroxide concentration decreased rapidly and Fe2+ concentration increased gradually. The voltage value had great effect on the concentrations of hydrogen peroxide and Fe2+, and the current efficiency was affected obviously by the time of current passed through iron anode under certain initial dosage of hydrogen peroxide. The better color removal was also obtained from electrochemical oxidation of dual electrodes. The electrochemical oxidation of dual electrodes with iron promoting presents a new alternative for the treatment of organic wastewater.
Chu
Yan-Yang
YY
School of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao 266042, China. cyyf200611@qust.edu.cn
Zhang
Qin-Hui
QH
Qian
Yi
Y
Bai
Mao-Juan
MJ
D000181:Acrylonitrile / Q000737:chemistry*; D004563:Electrochemistry / Q000379:methods; D004566:Electrodes; D007220:Industrial Waste; D007501:Iron / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*
D007220:Industrial Waste; D007501:Iron; D000181:Acrylonitrile