Authors
Kejin Zong, Shuangjiao Li, Zhaoxiang Wang, Na Feng, Xiaoyan Yao, Chunxiang Zhang, Jingjing Wang, Qian Wang, Congcong Zhao, Qiang Kong
Published in
Bioresource technology. Pages 135981. Sep 29, 2026. Epub Sep 29, 2026.
Abstract
Conventional constructed wetlands (CWs) often suffer from adsorption saturation and incomplete degradation when treating antibiotic wastewater, posing risks of pollutant re-release. An iron-carbon substrate was coupled with a microbial fuel cell in a vertical subsurface flow CW (FeC-MFC) based on the hypothesis that electroactive microbial enrichment and strengthened electron transfer would promote TC transformation and treatment stability under chronic TC stress (800 μg/L). FeC-MFC achieved 99.97% TC removal, reducing residual parent TC to 0.28 μg/L, while maintaining stable COD (86.95%) and TN (92.46%) removal. Bioelectrochemical coupling enriched Geobacter (10.09%) and maintained an electroactive microbial network under prolonged TC exposure, accompanied by enhanced functions related to xenobiotic transformation, stress response, cytochrome P450 metabolism and aromatic compound degradation. Enhanced electron transfer was associated with microbially mediated TC transformation. A greater diversity of transformation products included highly oxygenated and more polar intermediates was also detected. These findings associate electroactive bacterial enrichment and sustained electrical activity with more extensive TC transformation, highlighting the need to consider molecular transformation alongside removal efficiency when evaluating antibiotic treatment performance.
PMID:
42810693
Bibliographic data and abstract were imported from PubMed on 30 Sep 2026.
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