Effects of multi-microplastic mixtures on the performance of constructed wetland microbial fuel cells for wastewater treatment

IF 4.8 2区化学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY

Bioelectrochemistry Pub Date : 2025-05-19 DOI:10.1016/j.bioelechem.2025.109008

Shentan Liu , Lang He , Xiaojuan Feng

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Abstract

This study examined the effects of microplastics (MPs) on constructed wetland (CW) and constructed wetland microbial fuel cell (CW-MFC) with different configurations. Four mixed MP types including polyethylene, polypropylene, polystyrene, and polyvinyl chloride were introduced. Planted CW-MFC demonstrated the highest MP removal efficiency of 96.7 % and power density of 14.90 mW m⁻², outperforming both unplanted CW-MFC and conventional CW. MPs had minimal impact on COD removal, but the removal efficiencies of NH₄⁺-N and TN were significantly inhibited, with TN removal decreasing by approximately 20 % compared to MP-free conditions. TP removal initially decreased but later increased, remaining slightly lower than pre-MP levels. Reduced chlorophyll content in plant leaves indicated MP-induced stress on plant growth. Microbial analysis revealed dominant phyla including Proteobacteria, Patescibacteria, and Bacteroidota contributed to nitrogen removal. In planted systems, genera such as Denitratisoma, Sulfuritalea, and Endomicrobium contributed to denitrification. In CW-MFCs, Geobacter and Candidatus Falkowbacteria dominated, with Geobacter linked to electricity generation and Candidatus Falkowbacteria associated with carbon and nitrogen cycles. MPs negatively affected denitrification by suppressing key denitrifiers such as Denitratisoma but enhanced electricity generation by enriching electroactive bacteria like Geobacter. These findings reveal complex MP-driven interactions influencing microbial communities and system performance.

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多种微塑料混合物对污水处理人工湿地微生物燃料电池性能的影响

研究了微塑料（MPs）对不同配置的人工湿地（CW）和人工湿地微生物燃料电池（CW- mfc）的影响。介绍了聚乙烯、聚丙烯、聚苯乙烯和聚氯乙烯四种混合聚乙烯膜。种植的CW- mfc对MP的去除率最高，达到96.7%，功率密度为14.90 mW m−2，优于未种植的CW- mfc和常规CW。MPs对COD的去除影响很小，但对NH4+-N和TN的去除效率明显受到抑制，与无mp条件相比，TN的去除率降低了约20%。TP去除率开始下降，但随后增加，略低于mp前的水平。植物叶片叶绿素含量降低表明mp对植物生长有胁迫作用。微生物分析显示，优势门包括变形杆菌、Patescibacteria和拟杆菌门对氮的去除有贡献。在人工种植系统中，脱硝菌属、硫菌属和内生微生物属对反硝化作用有贡献。在cw - mfc中，地杆菌和假候选杆菌占主导地位，地杆菌与发电有关，假候选杆菌与碳和氮循环有关。MPs通过抑制关键反硝化菌（如脱硝体）对反硝化产生负面影响，但通过富集电活性细菌（如Geobacter）来增强发电量。这些发现揭示了复杂的mp驱动的相互作用影响微生物群落和系统性能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bioelectrochemistry 生物-电化学

CiteScore

9.10

自引率

6.00%

发文量

238

审稿时长

38 days

期刊介绍： An International Journal Devoted to Electrochemical Aspects of Biology and Biological Aspects of Electrochemistry Bioelectrochemistry is an international journal devoted to electrochemical principles in biology and biological aspects of electrochemistry. It publishes experimental and theoretical papers dealing with the electrochemical aspects of: • Electrified interfaces (electric double layers, adsorption, electron transfer, protein electrochemistry, basic principles of biosensors, biosensor interfaces and bio-nanosensor design and construction. • Electric and magnetic field effects (field-dependent processes, field interactions with molecules, intramolecular field effects, sensory systems for electric and magnetic fields, molecular and cellular mechanisms) • Bioenergetics and signal transduction (energy conversion, photosynthetic and visual membranes) • Biomembranes and model membranes (thermodynamics and mechanics, membrane transport, electroporation, fusion and insertion) • Electrochemical applications in medicine and biotechnology (drug delivery and gene transfer to cells and tissues, iontophoresis, skin electroporation, injury and repair). • Organization and use of arrays in-vitro and in-vivo, including as part of feedback control. • Electrochemical interrogation of biofilms as generated by microorganisms and tissue reaction associated with medical implants.