期刊
BIORESOURCE TECHNOLOGY
卷 363, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2022.127902
关键词
Microbial fuel cell -constructed wetland; Denitrification; Bioelectricity generation; Microbial community; Nitrogen transformation pathway
资金
- National Science and Technology Support Program [2015BAL02B04]
- National First-class Disciplines (PNFD)
- Postgraduate Research & Practice Innovation Program of Jiangsu Province [KYCX20_0864]
The microbial fuel cell-constructed wetland (MFC-CW) is effective for nitrogen removal in carbon constraint wastewater treatment. Wetland plants contribute to denitrification, and the bioenergy output is linearly related to influent COD. Key functional genera play a crucial role in nitrogen removal.
For the deep reduction of nitrogen, the microbial fuel cell-constructed wetland (MFC-CW) was conducted for treating carbon constraint wastewater. Results indicated that nitrogen removal decreased from 94.96% to 24.96% with influent COD/TN (chemical oxygen demand/total nitrogen) from 4 to 0. MFC-CW was seriously affected by low organic wastewater. Wetland plants contributed to denitrification, with TN removal increasing from 46.13% to 64.87%. The bioenergy output showed a linear relationship with influent COD, and the maximum power density of 1.17 mW/m2 was obtained. Correlation analysis indicated that functional genera of Paenibacillus, Trichococcus, norank_KD4-96, norank_OLB14 played a crucial role in nitrogen removal. Influent COD and wetland plants affected carbon and nitrogen metabolisms, and key genes related to denitrification were more abundant in the cathode. Findings illustrated the nitrogen metabolism in MFC-CW with carbon constraint wastewater and will extend the application of MFC-CW in secondary effluent treatment from wastewater treatment plants.
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