Nitrogen removal and power production efficiency of iron anode/biocathode single-chamber cell
XIA Da-peng, YUAN Lin-jiang, CHEN Xue-jiao, LIU Yan, WANG Jing-hua, MA Yan-chen
Key Laboratory of Northwest Water Resources and Environmental Ecology, Ministry of Education, Key Laboratory of Environmental Engineering of Shaanxi Province, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China
摘要 The denitrification and electricity generation efficiency of inorganic wastewater from iron anode biocathode single-chamber cells were investigated, and the dominant bacterial community structure of the biocathode was examined. The results showed that the internal resistance of the single-chamber cell was only 224.1 Ω under the condition of external 1000 Ω resistor and 40mg/L nitrate-nitrogen feed water, and the maximum power density reached 1.82W/m3 with the total nitrogen removal rate of 40%. After lowering the external resistance and nitrate-nitrogen load, the cell could be stably operated and treated inorganic wastewater with a nitrate-nitrogen load of 20mg/L under the external 200 Ω resistance, and the total nitrogen removal rate reached 95.8% within 2d. The maximum nitrate-nitrogen removal load was 0.0102kgNO3--N/(m3·d), which was a one-fold increase in nitrate-nitrogen removal load, indicating that the single-chamber iron-anode biocathode cell has a good capacity to remove low concentrations of nitrate-nitrogen in inorganic wastewaters. Analysis of the biocathode community showed that the diversity of the biocathode community was reduced compared with that of the inoculated sludge, and the absolute dominant genus was Thiobacillus, with a relative abundance of 40.8%, which was the main genus for cathodic electroautotrophic denitrification.
Abstract：The denitrification and electricity generation efficiency of inorganic wastewater from iron anode biocathode single-chamber cells were investigated, and the dominant bacterial community structure of the biocathode was examined. The results showed that the internal resistance of the single-chamber cell was only 224.1 Ω under the condition of external 1000 Ω resistor and 40mg/L nitrate-nitrogen feed water, and the maximum power density reached 1.82W/m3 with the total nitrogen removal rate of 40%. After lowering the external resistance and nitrate-nitrogen load, the cell could be stably operated and treated inorganic wastewater with a nitrate-nitrogen load of 20mg/L under the external 200 Ω resistance, and the total nitrogen removal rate reached 95.8% within 2d. The maximum nitrate-nitrogen removal load was 0.0102kgNO3--N/(m3·d), which was a one-fold increase in nitrate-nitrogen removal load, indicating that the single-chamber iron-anode biocathode cell has a good capacity to remove low concentrations of nitrate-nitrogen in inorganic wastewaters. Analysis of the biocathode community showed that the diversity of the biocathode community was reduced compared with that of the inoculated sludge, and the absolute dominant genus was Thiobacillus, with a relative abundance of 40.8%, which was the main genus for cathodic electroautotrophic denitrification.
夏大朋, 袁林江, 陈雪娇, 刘妍, 王景华, 马炎辰. 铁阳极/生物阴极单室电池脱氮及产电效能[J]. 中国环境科学, 2024, 44(11): 6114-6121.
XIA Da-peng, YUAN Lin-jiang, CHEN Xue-jiao, LIU Yan, WANG Jing-hua, MA Yan-chen. Nitrogen removal and power production efficiency of iron anode/biocathode single-chamber cell. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6114-6121.
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