Ferrihydrite enhanced the electrogenic hydrocarbon degradation in soil microbial electrochemical remediation
Ferrihydrite enhanced the electrogenic hydrocarbon degradation in soil microbial electrochemical remediation
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DOI：
10.1016/j.cej.2022.136901
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发表时间：
2022-05-13
影响因子：
15.1
通讯作者：
Li, Yongtao
中科院分区：
文献类型：
--
作者：
Chen, Xiaodong;Han, Ting;Li, Yongtao
在土壤微生物电化学修复中，铁的转化决定了外电活性和电子转移，从而决定了生物发电和污染物降解。在生物电流刺激下，添加具有（半）导电、绝缘的铁矿物和三铁的土壤微生物对石油烃进行降解。与对照组相比，水合铁处理的烃去除率提高了74%。其次磁铁矿处理优于赤铁矿和铁处理。148 d后累积电荷为铁水化物(1964C) >控制(1698C) >磁铁矿(1587C) >赤铁矿(1405C) >铁（1108C）。烃的降解效率和产电效率主要由物质转化基因决定的土壤功能决定。通过对11种铁态与功能基因丰富度的相关性分析，有机营养异化铁还原和短距离管道是提高系统性能的主要途径。同时，氮、硫、锰的转化与碳代谢表现出协同耦合关系。本工作全面揭示了土壤微生物电化学系统中铁态的转变及其对生态功能的影响。
Iron transformation determines the exoelectrogen activity and electron transfer and thus the bioelectricity generation and the contaminant degradation in soil microbial electrochemical remediation. Herein the addition of soil microbe with (semi)conductive, insulative iron minerals and ferric iron degrades the petroleum hydrocarbons under the biocurrent stimulation. The hydrocarbon removal increased by 74% in ferrihydrite treatment compared to the control. Next to magnetite treatment that was superior to hematite and ferric treatments. The accumulated charge was ferrihydrite (1964C) > control (1698C) > magnetite (1587C) > hematite (1405C) > ferric (1108C) after 148 days. The efficiencies of hydrocarbon degradation and electricity production were ascribed to the soil functions determined by substance transformation genes. Based on the correlation analysis between eleven iron states and functional genes richness, organotrophic dissimilatory iron reduction and short distance conduit were the main enhancement ways on the system performance. Meanwhile, conversions of nitrogen, sulfur and manganese exhibited a synergetic coupling relationship with the carbon metabolism. This work comprehensively revealed the transformation of iron states and their effects on ecological functions of soil microbial electrochemical system.