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Mechanism of Fe–C micro-electrolysis substrate to improve the performance of CW-MFC with different factors: Insights of microbes and metabolic function

Chemosphere, ISSN: 0045-6535, Vol: 304, Page: 135410
2022
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Article Description

Constructed wetland-microbial fuel cell (CW-MFC) is a novel technology for wastewater treatment with electrical generation. This work proposed a Fe–C micro-electrolysis substrate (Fe–C) with biomass modified ceramsite to enhance pollutants removal and electricity generation. The key influencing factors were revealed, and the COD, NH 4 + -N, and TP removal efficiency was respectively increased by 10.2, 8.1 and 8.78% with 76% higher power output at optimal conditions ( e.g. OLR 52.5 g/(m 2.d), HRT 48 h, and aeration rate 800 mL/min). Fe–C based substrates improved the microenvironments in CW-MFC, including dissolved oxygen (DO) and oxidation-reduction potential (ORP) lowering and electron transfer facilitation. These contributed to the enrichment of critical microorganisms and metabolic activities. The abundance of functional bacteria ( i.e. Geobacter, Thauera and Dechloromonas ) were evidently increased. Additionally, the energy metabolism and other functional genes encoding cytochrome c ( ccoN ), nitrite reductase ( nirD ) and phosphate transporter ( pstA ) were all stimulated.

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