473 / 2018-09-08 23:52:18

The positive effect of hydrochar and acetylene black in anaerobic digestion of vinegar residue

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Conductive materials can accelerate and stabilize the conversion of organic substrates to biomethane via direct interspecies electron transfer (DIET). However, the potential effect of DIET on complex wastes such as lignocellulosic biomass is still unclear. In this study, acetylene black (AB) or hydrochar (HC) were used to enhance the anaerobic digestion (AD) performance of vinegar residue. Results found that methane yield was increased by 50% and 232% with adding 1.0 g/L of HC and AB, respectively. Higher electron conductivity (2.06 S/cm) and larger specific surface area (74.31 m2/g) of AB indicated effective syntrophic metabolism as compared to that of HC. Interestingly, mono-digestion of AB and HC can also produce methane, with CH4 yield of 23.8 and 118.2 mL/g, respectively. Microbial community analysis showed that family Syntrophomonadaceae and Methanosarcinaceae were enriched after adding of AB or HC, suggesting that the DIET might be facilitated.