This study explores the roles of fulvic acid (FA) in both a conventionally constructed wetland (CCW) and a newly constructed wetland–microbial electrolysis cell (ECW). The results showed that FA increased the average removal efficiency of chemical oxygen demand, total phosphorus, total nitrogen, and ammonia nitrogen in ECW by 8.6, 46.2, 33.0, and 27.9 %, respectively, compared to CCW, and reduced the global warming potential by > 60 %. FA promoted the proliferation of electroactive bacteria (e.g., Chlorobaculum and Candidatus Tenderia) and FA-degrading bacteria (e.g., Anaerolineaceae and Gammaproteobacteria) and reduced methanogens (e.g., Methanothrix) via type-changing. The study’s findings suggest that FA influences pollutant removal and microbiome dynamics by altering dissolved oxygen levels and redox potential. In summary, FA and ECW enhanced the efficiency of constructed wetlands by facilitating electron transfer and consumption, and supporting microbial growth and metabolism.

中文翻译：

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黄腐酸对人工湿地-微生物电解池系统性能的影响：宏基因组见解


本研究探讨了黄腐酸（FA）在传统湿地（CCW）和新建湿地微生物电解池（ECW）中的作用。结果表明，与CCW相比，FA使ECW对化学需氧量、总磷、总氮和氨氮的平均去除效率分别提高了8.6%、46.2%、33.0%和27.9%，并降低了全球变暖潜势> 60%。 FA通过类型改变促进电活性细菌（例如绿杆菌和Candidatus Tenderia）和FA降解细菌（例如厌氧菌科和Gammaproteobacteria）的增殖并减少产甲烷菌（例如甲烷丝菌）。研究结果表明，FA 通过改变溶解氧水平和氧化还原电位来影响污染物去除和微生物动态。总之，FA 和 ECW 通过促进电子转移和消耗以及支持微生物生长和代谢来提高人工湿地的效率。