Ability of biochar to facilitate anaerobic digestion is restricted to stressed surroundings

Additives or external voltage are usually applied to promote methane production and organics degradation through the possible means of enhancing direct interspecies electron transfer (DIET), but their effectiveness and explanation are controversial. In this work, external voltage and additives (biochar and zeolite) were applied simultaneously and independently to laboratory-scale anaerobic reactors for further clues of DIET-enhancing mechanism....