Promoted reductive removal of chlorinated organic pollutants co-occurring with facilitated methanogenesis in anaerobic environment: A systematic review and meta-analysis

Conductive Materials on Biocathodes Altered the Electron-Transfer Paths and Modulated γ-HCH Dechlorination and CH4 Production in Microbial Electrochemical Systems

“…4 Electron transfer to reductively dechlorinate γ-HCH has been proven to co-occur alongside the reduction of CO 2 in a methanogenic process, 5 in which electron sinks that could compete with dechlorination were hydrogenotrophic methanogenesis (CO 2 + 4H 2 → CH 4 + 2H 2 O) and acetogenesis (2CO 2 + 4H 2 → CH 3 COO − + H + + 2H 2 O), with the acetate being fermented to CH 4 . 6 Although γ-HCH reduction and methanogenesis compete for the electron donor, 7 dechlorination was accelerated in the presence of methanogenesis, 8,9 perhaps because the methanogens produced vital cofactors for dechlorinators, like vitamin B 12 . 5,10 A microbial electrochemical system (MES) was capable of dechlorinating chlorinated organic pollutants (COPs) and producing CH 4 at its biocathode.…”