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| Microbial response characteristics of a constructed wetland-microbial fuel cell system to sodium dodecyl benzene sulfonate |
| Received:April 14, 2023 |
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| KeyWord:constructed wetland;microbial fuel cell;anionic surfactant;sodium dodecyl benzene sulfonate;microorganisms;electrochemically active bacteria |
| Author Name | Affiliation | | WANG Xiaoou | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | XIA Weiyi | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | WANG Huixin | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | LI Jiayin | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China | | XUE Ming | School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China |
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| Abstract: |
| Linear alkyl-benzene sulfonate(LAS)is the most widely used anionic surfactant in the field of daily chemicals, and alkylbenzene sulfonate and its degradation intermediates have been common representative organic pollutants in the environment. Taking sodium dodecyl benzene sulfonate(SDBS)as the target LAS, this study investigated the SDBS removal performance of the constructed wetland-microbial fuel cell coupling system(CW-MFC)and the microbial response characteristics of the system to SDBS by conducting lab-scale experiments. Results showed that as the influent SDBS concentration was 25 mg·L-1, the removal rate and removal load of SDBS in the CW-MFC were 44.3% and 6.74 g · m-3 · d-1, respectively. The addition of SDBS exerted relatively significant interference on the composition and activity of microbial communities in the CW-MFC system; it took the microorganisms a certain amount of time to adapt and develop the ability to degrade SDBS, while the electrochemically active bacteria(EAB)were more resistant to SDBS than other microbial species. SDBS promoted the richness and diversity of microbial communities attached to the surface of lava and anodes (anaerobic environment) while inhibiting the diversity of microbial communities attached to the surface of plant roots and cathodes (aerobic environment). The dominant bacteria on the surface of lava, cathodes, and anodes in the CW-MFC were Proteobacteria, Bacteroidota, and Desulfobacteroidota, respectively. SDBS significantly increased the relative abundance of EAB(Proteobacteria, Bacteroidota, Firmicutes, Acidobacteriota, etc.)in the anode area of the CW-MFC by 56.7%, thereby increasing the maximum output power density and reducing the internal resistance of the CW-MFC. Seven genera of SDBS degradation-related bacteria were available in the CW-MFC:Geobacter could participate in the β/ω oxidation process; Aeromonas, Acinetobacter, and Desulfovibrio could participate in the desulfonic acid process; Hydrogenophaga, Zoogloea, and Dechloromonas could participate in the benzene ring cleavage process, of which Geobacter and Desulfovibrio belong to anaerobic bacteria; and the others belong to aerobic bacteria. In addition, the relative abundance of SDBS degradation-related bacteria on the surface of lava was the highest, accounting for 61.61%. The research showed that SDBS changed the spatial distribution law of microbial communities, promoted the enrichment and growth of EAB and SDBS degradationrelated bacteria in the CW-MFC, and improved the electrochemical performance of the CW-MFC. Overall, it is feasible to use CW-MFC systems to treat anionic surfactants. |
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