铁阳极/生物阴极单室电池脱氮及产电效能

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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.

Key words： single-chamber biocathode autotrophic denitrification low carbon to nitrogen ratio wastewater iron anode

Received: 20 March 2024

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X703

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	Articles by authors
	XIA Da-peng
	YUAN Lin-jiang
	CHEN Xue-jiao
	LIU Yan
	WANG Jing-hua
	MA Yan-chen

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XIA Da-peng,YUAN Lin-jiang,CHEN Xue-jiao等. Nitrogen removal and power production efficiency of iron anode/biocathode single-chamber cell[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(11): 6114-6121.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I11/6114

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