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| Ferrihydrite enhanced petroleum hydrocarbon degradation by enriching functional microorganisms in soil microbial electrochemical system |
| Received:April 28, 2024 |
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| KeyWord:petroleum hydrocarbon pollution;soil Microbial Electrochemical System;ferrihydrite;functional microorganisms |
| Author Name | Affiliation | E-mail | | YU Xin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | YANG Side | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | CHEN Yonggang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | YANG Yuewei | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China
School of Environmental Science and Safety Engineering, Tianjin University of Technology, Tianjin 300384, China | | | SUN Jialu | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China
College of Resources and Environment Sciences, Northeast University, Shenyang 110004, China | | | ZHANG Yun | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China
College of Resources and Environment Sciences, Northeast Agricultural University, Harbin 150030, China | | | LI Xiaojing | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, MARA, Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | lixiaojing@caas.cn |
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| Abstract: |
| To investigate the response of indigenous microorganisms in soil Microbial Electrochemical System（MES） to exogenous ferrihydrite during enhanced petroleum hydrocarbon degradation. Three kinds of soil MES reaction devices were set up without electrode, open circuit and closed circuit, that is, under no biological electric field, local biological electric field and effective bioelectric field, petroleum hydrocarbon degradation and soil microbial community changes were investigated on day 0, day 202 and day 368. The results show that the conversion of ferrihydrite increases in the electrodeless, open and closed treatment sequence, which is accompanied by higher petroleum hydrocarbon degradation（up to 22% improvement over control）. The diversity of soil microbial community was enhanced and affected by deterministic processes after the addition of ferrihydrite. In addition, the symbiotic network relationship was strengthened, which enhanced the interaction between species. Although prolonged operation resulted in a 50% decrease in the abundance of dominant phylum（Desulfobacteriota, Firmicutes, Proteobacteria）and a 16% decrease in the abundance of dominant genus（SBR1031, SEEP-SRB1, KCM-B-112）in the system. However, ferrihydrite can choose to enrich functional microorganisms, including iron reducing bacteria （Geoalkalibacter, Limnobacter）, petroleum hydrocarbon degrading bacteria（Desulfosarcinaceae, Salinimicrobium, Immunisolibacter）, and electricity producing bacteria（Geoalkalibacter, Mycobacterium）, with the highest abundance increased to 4.7 times that of the control, to support the enhanced petroleum hydrocarbon degradation and electricity generation function of soil MES, which was also confirmed in the functional prediction. In summary, ferrihydrite can enhance the microbial electrochemical system's ability to degrade organic pollutants such as petroleum hydrocarbons by stimulating the colonization of functional microorganisms in the soil and strengthening their connections. |
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