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<b>Abstract</b>— <p>Active research in electrocatalytic properties of prokaryotes in the recent 30 years resulted in emergence of a new field of biotechnology—electricity generation in microbial fuel or electrolysis cells, where microbial cells act as biocatalysts of anodic or cathodic processes, consuming organic matter or producing biomass and added-value compounds in the course of electrotrophic CO<sub>2</sub> fixation. Application of microbial fuel cells (MFC) for wastewater treatment and bioremediation processes is considered the most economically promising direction. The prospects of MFC introduction or stimulation of electroactive microbial communities for purification of oil-contaminated anaerobic layers of soils and marine sediments have been recently considered. This technological variant has, however, serious technical limitations. The present work describes a laboratory sediment MFC (SMFC) with the bioanode and biocathode, which was inoculated with oil-contaminated soil and during 210 days of continuous operation acted as the sole power source for an autonomous sensor of the ambient air parameters. Electric current generation in the SMFC was accompanied by hydrocarbon degradation in contaminated soil and development of different microbial populations in the anoxic soil layer, at the anode, and at the cathode, with predominance of potential oil-degraders, electricigens, and electrotrophs, respectively. СО<sub>2</sub> release against the background of ambient air was minimal, indicating formation of an efficient gas filter in the SMFC. Short-term incubation of the SMFC under field conditions revealed a significant effect of temperature fluctuations on its physicochemical parameters, productivity, and the composition of the cathode microbial population. Changes in phylogenetic and physiological diversity of the microbial populations of different zones of the sediment MFC during its operation are discussed, and the prospects and problems of practical application of such systems for bioremediation of oil-contaminated soil are outlined.</p>

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Low CO2 Footprint Remediation of Oil-Contaminated Soil in a Sediment Microbial Fuel Cell

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • G. S. Klyushin,
  • A. S. Gogov,
  • A. E. Kolonskii,
  • A. R. Stroeva,
  • I. M. Elizarov,
  • A. A. Klyukina,
  • S. N. Gavrilov

摘要

Abstract—

Active research in electrocatalytic properties of prokaryotes in the recent 30 years resulted in emergence of a new field of biotechnology—electricity generation in microbial fuel or electrolysis cells, where microbial cells act as biocatalysts of anodic or cathodic processes, consuming organic matter or producing biomass and added-value compounds in the course of electrotrophic CO2 fixation. Application of microbial fuel cells (MFC) for wastewater treatment and bioremediation processes is considered the most economically promising direction. The prospects of MFC introduction or stimulation of electroactive microbial communities for purification of oil-contaminated anaerobic layers of soils and marine sediments have been recently considered. This technological variant has, however, serious technical limitations. The present work describes a laboratory sediment MFC (SMFC) with the bioanode and biocathode, which was inoculated with oil-contaminated soil and during 210 days of continuous operation acted as the sole power source for an autonomous sensor of the ambient air parameters. Electric current generation in the SMFC was accompanied by hydrocarbon degradation in contaminated soil and development of different microbial populations in the anoxic soil layer, at the anode, and at the cathode, with predominance of potential oil-degraders, electricigens, and electrotrophs, respectively. СО2 release against the background of ambient air was minimal, indicating formation of an efficient gas filter in the SMFC. Short-term incubation of the SMFC under field conditions revealed a significant effect of temperature fluctuations on its physicochemical parameters, productivity, and the composition of the cathode microbial population. Changes in phylogenetic and physiological diversity of the microbial populations of different zones of the sediment MFC during its operation are discussed, and the prospects and problems of practical application of such systems for bioremediation of oil-contaminated soil are outlined.