Toluene degradation by Cupriavidus metallidurans CH34 in nitrate-reducing conditions and in Bioelectrochemical Systems

FEMS Microbiology Letters
Anna Espinoza TofalosMichael Seeger

Abstract

Bioelectrochemical remediation of hydrocarbons is a technology that exploits the ability of specific microorganisms to use as electron acceptor an electrode, thus potentially lowering the operational costs related to classical bioremediation. Several well-characterized hydrocarbonoclastic strains might be electroactive, thus their biodegradation performances in Bioelectrochemical Systems should be studied. Cupriavidus metallidurans CH34 is a model metal-resistant strain whose capacity to degrade benzene aerobically has recently been described. In this study, toluene degradation under anaerobic conditions and the exoelectrogenic capacity of Cupriavidus metallidurans CH34 were determined. Strain CH34 was grown anaerobically with toluene as sole carbon source in sealed serum bottles and then inoculated in a Microbial Electrolysis Cell (MEC) to assess its exoelectrogenic capacity. It was demonstrated for the first time that strain CH34 is able to degrade toluene under nitrate-reducing conditions (up to 45 mgtoluene/L were removed within 17 days, corresponding to 73% of toluene amended). Nitrate consumption and cellular growth were observed during toluene removal. In the MEC, toluene degradation was linked to current production, sho...Continue Reading

Citations

May 27, 2021·World Journal of Microbiology & Biotechnology·Karina Becerril-VarelaClaudia Guerrero-Barajas
Jul 17, 2021·International Microbiology : the Official Journal of the Spanish Society for Microbiology·Ayixon Sánchez-ReyesAlejandro Sanchez-Flores

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