Treatment of hexavalent chromium-containing wastewater by CW-MFC and simultaneous power generation
MU Chun-xia1, WANG Lin1, WANG Li2
1. College of Environmental Science and Engineering, Ocean University of China, Qingdao 266100, China; 2. School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China
Abstract: The constructed wetland coupled with microbial fuel cell (CW-MFC) is adopted to treat with hexavalent chromium[Cr(Ⅵ)]-containing wastewater and simultaneously generate power.The effects of COD mass concentration, Cr(Ⅵ) mass concentration and hydraulic retention time (HRT) on the treatment of chromium-containing wastewater and the simultaneous production of electricity at different electrode spacing are investigated.It is shown that the voltage of CW-MFC increases firstly and decreases then with the increases of COD and Cr(Ⅵ) mass concentrations.The smaller the electrode spacing, the smaller the ohmic resistance.The output voltage and power density of the system reaches the maximum, and the removal rates of COD and Cr(Ⅵ) reach the highest when the electrode spacing is 10 cm.With the elongation of HRT, the power production performance and wastewater treatment capacity increases firstly and decreases then.As the electrode spacing is 10 cm, the maximum power density and the highest removal rate of COD are 458.24 mW·m-3 and 92.50% (HRT=2 d), respectively, and the maximum removal rate of Cr(Ⅵ) is 92.96% (HRT=3 d).
牟春霞, 王琳, 王丽. CW-MFC处理六价铬废水及同步产电的研究[J]. 现代化工, 2022, 42(6): 106-111.
MU Chun-xia, WANG Lin, WANG Li. Treatment of hexavalent chromium-containing wastewater by CW-MFC and simultaneous power generation. Modern Chemical Industry, 2022, 42(6): 106-111.
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