TY - JOUR
T1 - Efficient nitrogen removal in microbial fuel cell – constructed wetland with corncobs addition for secondary effluent treatment
AU - Tao, Mengni
AU - Jing, Zhaoqian
AU - Tao, Zhengkai
AU - Luo, Hui
AU - Zuo, Simin
AU - Li, Yu You
N1 - Funding Information:
We gratefully acknowledge the financial support from the National Science and Technology Support Program ( 2015BAL02B04 ); the Technology Project of China Housing and Urban Rural Development Ministry ( 2015-K7-012 ); a Project Funded by the National First-class Disciplines (PNFD); and a Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) ; Postgraduate Research & Practice Innovation Program of Jiangsu Province (KYCX20_0864 ).
Publisher Copyright:
© 2021 Elsevier Ltd
PY - 2022/1/15
Y1 - 2022/1/15
N2 - Treatment of secondary effluent from municipal wastewater treatment plants (WWTPs) is urgently needed owing to the fact that excess nitrogen in secondary effluent can cause eutrophication. To promote nitrogen removal and bioelectricity generation performance of microbial fuel cell - constructed wetland (MFC-CW) when treating secondary effluent from WWTPs, the corncobs as external biomass carbon sources were added on the surface of wetlands. Besides, the MFC system was constructed to explore the effect of wetland plants (water hyacinth). In order to investigate the optimal dosage of corncobs, the performance of MFC-CW with different dosages (0, 30 and 70 g/m2) of corncobs were compared. Results revealed that 70 g/m2 of corncobs addition significantly enhanced denitrification performance and bioelectricity generation, with the highest nitrate removal of 99.3% and 100%, and maximum power density of 0.87 mW/m2 and 1.92 mW/m2 in MFC and MFC-CW, respectively. High-throughput sequencing analysis indicated that microorganisms related to organics degradation were detected in both anode and cathode areas. The functional genera such as Nitrospira, unclassified_Comamonadaceae, and Bacillus were higher in MFC-CW, which contributed to higher nitrogen removal and bioelectricity generation. Functional genes and enzymes revealed that nitrification, denitrification and anammox might participate in the nitrogen metabolism together. This research provides a promising way to utilize biomass carbon sources in MFC-CW to treat secondary effluent for simultaneous nitrogen removal and energy recovery.
AB - Treatment of secondary effluent from municipal wastewater treatment plants (WWTPs) is urgently needed owing to the fact that excess nitrogen in secondary effluent can cause eutrophication. To promote nitrogen removal and bioelectricity generation performance of microbial fuel cell - constructed wetland (MFC-CW) when treating secondary effluent from WWTPs, the corncobs as external biomass carbon sources were added on the surface of wetlands. Besides, the MFC system was constructed to explore the effect of wetland plants (water hyacinth). In order to investigate the optimal dosage of corncobs, the performance of MFC-CW with different dosages (0, 30 and 70 g/m2) of corncobs were compared. Results revealed that 70 g/m2 of corncobs addition significantly enhanced denitrification performance and bioelectricity generation, with the highest nitrate removal of 99.3% and 100%, and maximum power density of 0.87 mW/m2 and 1.92 mW/m2 in MFC and MFC-CW, respectively. High-throughput sequencing analysis indicated that microorganisms related to organics degradation were detected in both anode and cathode areas. The functional genera such as Nitrospira, unclassified_Comamonadaceae, and Bacillus were higher in MFC-CW, which contributed to higher nitrogen removal and bioelectricity generation. Functional genes and enzymes revealed that nitrification, denitrification and anammox might participate in the nitrogen metabolism together. This research provides a promising way to utilize biomass carbon sources in MFC-CW to treat secondary effluent for simultaneous nitrogen removal and energy recovery.
KW - Bacillus
KW - Bioelectricity generation
KW - Biomass carbon source
KW - Denitrification
KW - Low carbon wastewater
KW - Nitrogen removal improvement
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U2 - 10.1016/j.jclepro.2021.130108
DO - 10.1016/j.jclepro.2021.130108
M3 - Article
AN - SCOPUS:85121207862
SN - 0959-6526
VL - 332
JO - Journal of Cleaner Production
JF - Journal of Cleaner Production
M1 - 130108
ER -
