SUNLi-ping,MOYing-hui,YUANTing-ting,et al.Voltage Regulation Strategy for Startup of O2-reducing Biocathode Electrocatalytic Reactor and Its Phenol Removal Behavior[J].China Water & Wastewater,2023,39(3):32-39.
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Voltage Regulation Strategy for Startup of O2-reducing Biocathode Electrocatalytic Reactor and Its Phenol Removal Behavior

China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU] volume: 第39卷 Number: 第3期 Page: 32-39 Column: Date of publication: 2023-02-01
Author(s):
SUN　Li-ping1; 2;  MO　Ying-hui1; 2;  YUAN　Ting-ting2; 3;  JIANG　Tao4; 5
（1. School of Environmental Science and Engineering， Tiangong University， Tianjin 300387， China； 2. State Key Laboratory of Separation Membranes and Membrane Processes， Tiangong University， Tianjin 300387， China； 3. School of Material Science and Engineering， Tiangong University， Tianjin 300387， China； 4. Beijing Lianhe Zongheng Management Consulting Co. Ltd.， Beijing 100101， China； 5. Tianjin Jingang Petrochemical Co. Ltd.， Tianjin 300191， China）
Keywords:
O2-reducing biocathode;  electrocatalysis;  voltage regulation strategy for startup;  removal of phenol;  energy consumption
Abstract:
The voltage regulation strategy was used to realize the coupling of O2-reducing biocathode and MnOx/Ti porous anode to construct an O2-reducing biocathode electrocatalytic reactor (BECR) for phenol removal. The effects of voltage on reactor startup, microbial community composition of the cathode and phenol removal were investigated. The variations of current density and cathode potential showed that the BECR could be successfully started at voltages of 0.7 V, 1 V and 1.3 V. The startup period of BECR at voltages of 0.7 V and 1 V was approximately 30 days, which was shorter than that of BECR at 1.3 V (approximately 60 days). The reduction of O2 to H2O occurred on the cathode after the startup of BECR. The microbial community composition on the cathode of BECR was analyzed, and Proteobacteria was found to be the dominant bacteria phylum on the cathode. Pseudomonas and Brevibacterium were the main bacterial genera to realize O2 reduction reaction when the starting voltage was 0.7 V, while Stenotrophomonas was the main bacterial genus to achieve O2 reduction when the starting voltage was 1 V. Compared with the cathode of BECR started at voltage of 1 V, that of BECR started at voltage of 0.7 V had a higher abundance of O2-reducing bacteria. When the influent concentration of phenol was 2 mmol/L, the TOC removal rates of BECR was (49.99±0.36)% and (42.10±0.28)% at voltages of 0.7 V and 1 V, and the energy consumption was 1.67 kW·h/kgTOC and 9.55 kW·h/kgTOC, respectively. Therefore, the BECR started at voltage of 0.7 V had a higher TOC removal rate and lower energy consumption than that started at voltage of 1 V.
Last Update: 2023-02-01