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- Title
Enhanced Nitrate Nitrogen Removal from Constructed Wetland via Fe 3 O 4 /Granular Activated Carbon Anode Microbial Electrolysis Cell under Low C/N Ratio.
- Authors
Yang, Heng; Tan, Shenyu; Huang, Yu; Tang, Xinhua
- Abstract
In this study, a constructed wetland–Fe3O4/granular activated carbon anode microbial electrolysis cell (CW-FMEC) was constructed to enhance denitrification in low COD/N ratio wastewater. The introduction of Fe3O4 boosted the expression of functional genes involved in the denitrification pathway, and the abundance of narG, nirS, and nosZ increased by 99.29%, 70.54%, and 132.18%, respectively, compared to CW. In addition, the content of c-type cytochromes (c-Cyts) and EPS were also enhanced in the CW-FMEC. The microbial communities study displayed that Thauera, Dechloromonas, and Arenimonas became the main genera for denitrification. The denitrification performance at different COD/N ratios was investigated in depth. Under optimal working circumstances, the CW-FMEC had an excellent nitrate removal rate (88.9% ± 1.12%) while accumulating nearly no NO2−-N or NH4+-N in the effluent. This study provides a new direction for the development of CW-MEC and accelerates its implementation.
- Subjects
IRON oxides; CONSTRUCTED wetlands; MICROBIAL cells; ACTIVATED carbon; WETLAND conservation
- Publication
Water (20734441), 2024, Vol 16, Issue 10, p1377
- ISSN
2073-4441
- Publication type
Article
- DOI
10.3390/w16101377