Iron reducing sludge as a source of electroactive bacteria: assessing iron reduction in biofilm bacteria, planktonic cells and isolates from a microbial fuel cell

• Published in: Archives of microbiology 2022-10, Vol.204 (10), p.632-632, Article 632
• Main Authors: González-Paz, José Roberto, Becerril-Varela, Karina, Guerrero-Barajas, Claudia
• Format: Article
• Language: English
• Subjects: Acetic acid; Archives & records; Bacteria; Biochemical fuel cells; Biochemistry; Biofilms; Biomass; Biomedical and Life Sciences; Biotechnology; Cell Biology; Citrobacter; Dietary minerals; Ecology; Electrodes; Experiments; Fuel cells; Fuel technology; Iron; Life Sciences; Microbial Ecology; Microbiology; Microorganisms; Original Paper; Planktonic cells; Sediments; Sludge
• ISSN: 0302-8933; 1432-072X
• DOI: 10.1007/s00203-022-03253-6

In this study, bacteria from a microbial fuel cell (MFC) and isolates were evaluated on their Fe 3+ reduction capability at different concentrations of iron using acetate as the sole source of carbon. The results demonstrated that the planktonic cells can reach an iron reduction up to 60% at 27 mmol Fe 3+ . Azospira oryzae ( µ 0.89 ± 0.27 d −1 ) and Cupriavidus metallidurans CH34 ( µ 2.34 ± 0.81 d −1 ) presented 55 and 62% of Fe 3+ reduction, respectively, at 16 mmol l −1 . Enterobacter bugandensis ( µ 0.4 ± 0.01 d −1 ) 40% Fe 3+ at 27 mmol l −1 , Citrobacter freundii ATCC 8090 ( µ 0.23 ± 0.05 d −1 ) and Citrobacter murliniae CDC2970-59 ( µ 0.34 ± 0.02 d −1 ) reduced Fe 3+ in ~ 50%, at 55 mmol l −1 . This is the first report on these bacteria on a percentage of iron reduction. These results may be useful for anode design to contribute to a higher energy generation in MFCs.