Regulation of PCE-Dechlorinating Activity by Electrochemical Cultivation
Tetrachloroethene (PCE) is one of the grave environmental pollutants. Certain anaerobic bacteria have the ability to dechlorinate PCE as an electron acceptor for their respiration (dehalorespiration). Previously, we accumulated PCE-dechlorinating culture in the presence of Fe(III)-EDTA. In this study, we have described the regulation of dehalorespiration by electrolytic control of the Fe(II)/Fe(III) ratio using a potentiostat (electrochemical cultivation). PCE-dechlorinating culture was cultivated under H2 conditions at constant redox potentials ranging from –0.1 to –0.8 V. After electrochemical cultivation for 3 weeks, PCE-dechlorinating activity of the mixed culture varied at different redox potentials. At –0.6 V, the culture showed the highest activity and the highest ratio of Desulfitobacterium/total bacteria. Electrochemical cultivation is a useful method for regulating PCE-dechlorinating bacterium.
Axel Schippers, Wolfgang Sand, Franz Glombitza and Sabine Willscher
S. Hirano et al., "Regulation of PCE-Dechlorinating Activity by Electrochemical Cultivation", Advanced Materials Research, Vols. 20-21, pp. 319-322, 2007