Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, Nanjing 210098, China; College of Environment, Hohai University, Nanjing 210098, China.
Sci Total Environ. 2024 Aug 20;939:172979. doi: 10.1016/j.scitotenv.2024.172979. Epub 2024 May 3.
Integrating microbial fuel cells (MFC) into constructed wetland systems (CW) has been an efficient wastewater treatment to improve the pollutants removal and regenerate power energy. This study fabricated a sludge biochar material (SBM) to sequestrate the carbon of residual sludge. Thereafter used SBM and modified SBM as the substrate materials to construct three groups of CW-MFC for decreasing the greenhouse gas (GHG) emission. The water quality improvement in removal efficiency achieved (2.59 %, 3.10 %, 5.21 % for COD; 3.31 %, 3.60 %, 6.71 % for TN; 1.80 %, 7.38 %, 4.93 % for TP) by the application of MFC, SBM, and modified SBM in wastewater treatment, respectively. Additionally, the reduction in global warming potential (GWP) realized 17.2 %, 42.2 %, and 64.4 % resulting from these applications. The carbon flow and fate diagrams showed MFC shifted the gas phase‑carbon flow from CH to CO, and SBM promoted this shift trends. Microbial diversity indicated enrichment of electrochemically active bacteria (EAB), denitrifying bacteria, and phosphate accumulating organisms (PAOs) by SBM. Metabolic pathways analysis showed that introduction of MFC and SBM exhibited significant increases of key functional genes in metabolic pathway of anaerobic oxidation of methane (AOM). This study highlights the benefit of CW-MFC in and provides a new strategy for removing pollutants and abating GHG emissions in wastewater treatment.
将微生物燃料电池 (MFC) 集成到人工湿地系统 (CW) 中是一种有效的废水处理方法，可以提高污染物去除率并再生能源。本研究制备了一种污泥生物炭材料 (SBM) 来固定剩余污泥中的碳。然后，将 SBM 和改性 SBM 用作基质材料，构建了三组 CW-MFC，以减少温室气体 (GHG) 的排放。应用 MFC、SBM 和改性 SBM 分别处理废水，可分别实现水质改善，去除效率提高（COD 分别提高 2.59%、3.10%、5.21%；TN 分别提高 3.31%、3.60%、6.71%；TP 分别提高 1.80%、7.38%、4.93%）。此外，应用这些方法可分别将全球变暖潜势 (GWP) 降低 17.2%、42.2%和 64.4%。碳流和归宿图表明，MFC 将气相碳流从 CH 转移到 CO，SBM 促进了这种转移趋势。微生物多样性表明，SBM 富集了电化学活性细菌 (EAB)、反硝化细菌和聚磷菌 (PAO)。代谢途径分析表明，引入 MFC 和 SBM 显著增加了代谢途径中甲烷厌氧氧化 (AOM) 的关键功能基因。本研究强调了 CW-MFC 的优势，并为污水处理中去除污染物和减少 GHG 排放提供了新策略。
