Carbon-based conductive materials accelerated methane production in anaerobic digestion of waste fat, oil and grease

Little is known about the effect of carbon-based conductive material (CM) addition on anaerobic co-digestion fat, oil and grease (FOG) waste activated sludge (WAS). In this study, three types CMs (nano-graphite (NG), granular carbon (GAC), cloth (CC)) nine dosages were evaluated for their influences performance. The best dosage was achieved at 0.2 g/L NG, 10 GAC, 1 cm × 5 CC with 13–22% incremental methane production, 25–55% increased VS removal 28–32% enhanced COD conversion efficiency compared to control. highest total amount bacteria/archaea found in (1 cm), followed by GAC NG g/L, which all higher than those Microbial community analysis revealed that direct interspecies electron transfer (DIET)-mediated syntrophic acetate oxidation (SAO) enabling faster might be responsible enhancement production.