Microbial fuel cell system with catalytic electrode membrane and granular activated carbon in treating coking wastewater
ZHANG Qian1,, LIU Lifen1,2,, 1.School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China 2.School of Ocean Science & Technology, Dalian University of Technology, Panjin 124221, China
Abstract:It is difficult and costly in treating various types of wastewater containing refractory pollutants, and the discharge of a large amount of substandard industrial wastewater will cause pollution that seriously threaten the ecological balance and human health. For efficient, energy-saving and sustainable wastewater treatment, new catalytic electrode membrane with enclosed granular activated carbon (GAC) or manganese dioxide loaded GAC (MnO2/GAC) were used to expand the cathode volume in a 11-L up-flow microbial fuel cell (MFC) integrated with membrane bioreactor (MBR) system. The electricity generation performance and pollutants removal effect of this MFC-MBR system were investigated when it treated coking wastewater. The results showed that the order of electricity generation and pollutants removal was the MFC-MBR system with catalytic electrode membrane and enclosed MnO2/GAC cathode > the system using catalytic electrode membrane with enclosed GAC as cathode > the system using only carbon fiber cloth electrode and enclosed GAC as cathode. The maximum power density of the system with catalytic electrode membrane with enclosed GAC as cathode was 1 041.35 mW·m?3, which was 7.4 times higher than the control group that only using carbon fiber cloth electrode and enclosed GAC as cathode. The internal resistance decreased from 309 to 104 Ω, that effectively reduced the internal energy loss of the system. The system with catalytic electrode membrane and enclosed MnO2/GAC cathode could efficiently remove 95.75% COD and 92.81% $ {\rm{NH}}_4^ + $-N from coking wastewater; COD removal loading was 1.55 kg·(m3·d)?1 and 25% higher than the control group. When treating another coking wastewater, increasing aeration in the cathode could increase the COD removal efficiency, and the COD concentration in the effluent was less than 40 mg·L?1, reaching the first-level discharge standard, the COD removal loading was 1.67 kg·(m3·d)?1. The MFC-MBR coupled system had better pollutant removal and higher electricity generation performance in treating coking wastewater than others, provides an effective and feasible solution to the refractory industrial wastewater treatment. Key words:microbial fuel cell/ electro-catalyst/ coking wastewater/ membrane bioreactor/ electricity generation performance.
图1含扩展颗粒活性炭阴极的MFC-MBR装置示意图 Figure1.Schematic diagram of MFC-MBR system with expanded GAC cathode
图5系统处理第1种焦化废水的出水COD、$ {{\bf{NH}}_4^ +} $-N的浓度和去除率 Figure5.Concentrations and removal rate of COD and ${ {\rm{NH}}_4^ +} $-N in effluent when treating the first type of coking wastewater
图6系统处理第2种焦化废水的出水COD、${ {\bf{NH}}_4^ +} $-N和$ {{\bf{NO}}_3^ - }$-N的浓度和去除率 Figure6.Concentration and removal rate of COD, $ {{\rm{NH}}_4^ +} $-N and $ {{\rm{NO}}_3^ - }$-N in effluent when treating the second type of coking wastewater
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1.School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China 2.School of Ocean Science & Technology, Dalian University of Technology, Panjin 124221, China Received Date: 2020-10-06 Accepted Date: 2021-01-15 Available Online: 2021-04-23 Keywords:microbial fuel cell/ electro-catalyst/ coking wastewater/ membrane bioreactor/ electricity generation performance Abstract:It is difficult and costly in treating various types of wastewater containing refractory pollutants, and the discharge of a large amount of substandard industrial wastewater will cause pollution that seriously threaten the ecological balance and human health. For efficient, energy-saving and sustainable wastewater treatment, new catalytic electrode membrane with enclosed granular activated carbon (GAC) or manganese dioxide loaded GAC (MnO2/GAC) were used to expand the cathode volume in a 11-L up-flow microbial fuel cell (MFC) integrated with membrane bioreactor (MBR) system. The electricity generation performance and pollutants removal effect of this MFC-MBR system were investigated when it treated coking wastewater. The results showed that the order of electricity generation and pollutants removal was the MFC-MBR system with catalytic electrode membrane and enclosed MnO2/GAC cathode > the system using catalytic electrode membrane with enclosed GAC as cathode > the system using only carbon fiber cloth electrode and enclosed GAC as cathode. The maximum power density of the system with catalytic electrode membrane with enclosed GAC as cathode was 1 041.35 mW·m?3, which was 7.4 times higher than the control group that only using carbon fiber cloth electrode and enclosed GAC as cathode. The internal resistance decreased from 309 to 104 Ω, that effectively reduced the internal energy loss of the system. The system with catalytic electrode membrane and enclosed MnO2/GAC cathode could efficiently remove 95.75% COD and 92.81% $ {\rm{NH}}_4^ + $-N from coking wastewater; COD removal loading was 1.55 kg·(m3·d)?1 and 25% higher than the control group. When treating another coking wastewater, increasing aeration in the cathode could increase the COD removal efficiency, and the COD concentration in the effluent was less than 40 mg·L?1, reaching the first-level discharge standard, the COD removal loading was 1.67 kg·(m3·d)?1. The MFC-MBR coupled system had better pollutant removal and higher electricity generation performance in treating coking wastewater than others, provides an effective and feasible solution to the refractory industrial wastewater treatment.
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