Performance and microbial community analysis in microbial desalination cells with different cathodes for mustard tuber wasterwater treatmment
CHEN Wenting1,2,, LI Xuan1, FU Guokai1,2,, 1.College of Environmental and Ecology, Chongqing University, Chongqing 400045, China 2.Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing University, Chongqing 400045, China
Abstract:To realize the purpose of simultaneous electricity generation and salt removal, the microbial desalination cell (MDC) based on bioelectrochemistry was constructed for mustard tuber wastewater treatment(MTWW). In this study, the electricity generation and salt removal of potassium ferricyanide and water-cathode MDC were examined, and the microbial community in the sytem was analyzed. The results showed that within the same desalination time, the salt removal rate of the potassium ferricyanide group was 90.30%, being slightly higher than that of the water-cathode group. Over the entire desalination cycle, the electricity generation of the potassium ferricyanide group was better than that of water-cathode group. With the extension of desalinization time, the electricity generation of the potassium ferricyanide group decreased slightly, while the electricity generation of water-cathode group increased significantly. Methanosaeta(23.55%), Geobacter(14.09%)and vadinHA17(8.64%)were the dominant bacteria in anodic biofilm of the potassium ferricyanide group, while vadinHA17(18.17%), Methanosaeta(13.00%)and Methanosaeta(9.79%)were the dominant bacteria in cathodic biofilm of the water-cathode group. Of which Geobacter belongs to electrgenic bacteria, vadinHA17 belongs to hydrolyzed fermentation bacteria, Methanosaeta and Methanosaeta belong to methanogens. The abundance of methanogens in the anodic biofilm of the potassium ferricyanide group and water-cathode group was pretty high. However, the methanogens have an adverse effect on electricity generation and salt removal, therefore, it is necessary to find a suitable method for inhibiting the generation of methanogens. At the later stage of operation, the electrogenic bacteria appeared in the cathode of the water-cathode group, which greatly reduced the cathode overpotential and improved the electricity generation of the system. This study provides a reference for resuorce utilization of MTWW. Key words:microbial desalination cell/ mustard tuber wastewater/ potassium ferricyanide/ microbial community analysis.
图1微生物脱盐燃料电池实验装置 Figure1.Picture and schematic diagram of microbial desalination cell
图4铁氰化钾和水阴极组阳极室进水、出水COD及COD去除率 Figure4.Influent, effluent COD of anode chamber and COD removal rate for the potassium ferricyanide and water-cathode groups
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1.College of Environmental and Ecology, Chongqing University, Chongqing 400045, China 2.Key Laboratory of Eco-Environments in Three Gorges Reservoir Region, Ministry of Education, Chongqing University, Chongqing 400045, China Received Date: 2019-11-23 Accepted Date: 2020-03-01 Available Online: 2020-10-14 Keywords:microbial desalination cell/ mustard tuber wastewater/ potassium ferricyanide/ microbial community analysis Abstract:To realize the purpose of simultaneous electricity generation and salt removal, the microbial desalination cell (MDC) based on bioelectrochemistry was constructed for mustard tuber wastewater treatment(MTWW). In this study, the electricity generation and salt removal of potassium ferricyanide and water-cathode MDC were examined, and the microbial community in the sytem was analyzed. The results showed that within the same desalination time, the salt removal rate of the potassium ferricyanide group was 90.30%, being slightly higher than that of the water-cathode group. Over the entire desalination cycle, the electricity generation of the potassium ferricyanide group was better than that of water-cathode group. With the extension of desalinization time, the electricity generation of the potassium ferricyanide group decreased slightly, while the electricity generation of water-cathode group increased significantly. Methanosaeta(23.55%), Geobacter(14.09%)and vadinHA17(8.64%)were the dominant bacteria in anodic biofilm of the potassium ferricyanide group, while vadinHA17(18.17%), Methanosaeta(13.00%)and Methanosaeta(9.79%)were the dominant bacteria in cathodic biofilm of the water-cathode group. Of which Geobacter belongs to electrgenic bacteria, vadinHA17 belongs to hydrolyzed fermentation bacteria, Methanosaeta and Methanosaeta belong to methanogens. The abundance of methanogens in the anodic biofilm of the potassium ferricyanide group and water-cathode group was pretty high. However, the methanogens have an adverse effect on electricity generation and salt removal, therefore, it is necessary to find a suitable method for inhibiting the generation of methanogens. At the later stage of operation, the electrogenic bacteria appeared in the cathode of the water-cathode group, which greatly reduced the cathode overpotential and improved the electricity generation of the system. This study provides a reference for resuorce utilization of MTWW.
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