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Synchronously accelerated petroleum hydrocarbon removal in soil and leachate by the bioelectrochemical systems for over 1200 days
Electrochimica Acta ( IF 5.5 ) Pub Date : 2025-01-23 , DOI: 10.1016/j.electacta.2025.145746
Xin Yu, Yan Xu, Xiaolin Zhang, Side Yang, Xiaodong Zhao, Penghui Li, Chengxi Li, Jirui Zhao, Xiaojing Li

Bioelectrochemical system has developed to remediate petroleum contamination in soil and groundwater. However, little is known about the remediation performance under a long-term operation. Here, we constructed a soil-leaching system that operated uninterruptedly for 1280 days to remove petroleum hydrocarbons from soil and simulated groundwater. A 65% increment for degradation with the iron redox was observed compared to the natural degradation (9081 mg/kg of removal relative to original soil). Notably, the recalcitrant organics was decomposed by the biocurrent stimulation on the microbial metabolism, supporting by 128% lower of humification degree and 35% higher of microbial metabolism. Consequently, contents of humic acid- and fulvic acid-like compounds increased by 100% and 55% respectively, and the carbohydrate enhanced by 108% with more than 55% proportion of compounds containing CHO only in dissolved organic matter. While, the aromatics decreased by 33% under the biocurrent stimulation based on fourier transform ion cyclotron resonance mass spectrometry. Network analysis revealed that biocurrent can facilitate the connectivity of functional microorganisms due to the biocurrent directed selection enriching Fe-reducing bacteria Geobacter, Thiobacillius and Clostridium_sensus and enhancing the cooperation between the functional genes (Fro2, FOB, MtrC, and alkB) and the species. Overall, this study provides insights into the long-term in-situ bioelectrochemical degradation of petroleum pollution in soil and groundwater.

中文翻译:


通过生物电化学系统同步加速去除土壤和渗滤液中的石油烃,持续 1200 多天



生物电化学系统已经开发出来,可以修复土壤和地下水中的石油污染。但是,人们对长期操作下的修复性能知之甚少。在这里,我们构建了一个土壤浸出系统,该系统不间断运行 1280 天,以去除土壤和模拟地下水中的石油烃。与自然降解相比,观察到铁氧化还原的降解增加了 65%(相对于原始土壤的去除率为 9081 mg/kg)。值得注意的是,顽固的有机物被生物电流刺激微生物代谢分解,腐殖化程度降低 128%,微生物代谢高 35%。因此,腐植酸和黄腐酸类化合物的含量分别增加了 100% 和 55%,碳水化合物的含量增加了 108%,其中 55% 以上的化合物仅在溶解有机物中含有 CHO。而在基于傅里叶变换离子回旋共振质谱的生物电流刺激下,芳烃含量降低了 33%。网络分析显示,由于生物电流定向选择富集了 Fe 还原细菌 Geobacter、Thiobacillius 和 Clostridium_sensus,并增强了功能基因 (Fro2、FOB、MtrC 和 alkB) 与物种之间的合作,生物电流可以促进功能微生物的连接。总体而言,本研究为土壤和地下水中石油污染的长期原位生物电化学降解提供了见解。
更新日期:2025-01-23
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