Rapidly developing bioelectrochemical technology has been proved
to be a promising platform for CO2 capture and conversion comparing
with othermethods [2]. With a small addition of voltage at themicrobial
electrolysis cell (MEC), electromethanogens can use electrons or hydrogen
formed at cathode to convert CO2 into CH4 directly [3,4]. In the
present work, a novel process, i.e., coupling microbial electrolysis cell
and anaerobic digestion, for in situ converting CO2 into CH4 and enhancing
CH4 production simultaneouslywas introduced. In this newprocess,