Biochar triggering multipath methanogenesis and subdued propionic acid accumulation during semi-continuous anaerobic digestion. (December 2019)

• Record Type: Journal Article
• Authors: Ma, Junyi; Pan, Junting; Qiu, Ling; Wang, Quan; Zhang, Zengqiang
• Is Part Of: Bioresource technology. Volume 293(2019)
• Publication Date: 2019-12
• Subjects: Dry chicken manure -- Anaerobic digestion -- Biochar -- Specific methane production -- Microbial community; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2019.122026
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: Dry chicken manure is applicable to anaerobic digestion with desired methane yield. Adding biochar accelerated the methanogenesis rate especially at inhibition stage. The undesired propionic acid was substantially reduced by biochar supplement. Biochar can contribute to acclimate an efficient microbial syntrophic consociation. Abstract: The semi-continuous anaerobic digestion (AD) performances of dry chicken manure (DCM) were investigated at the temperature of 35 ± 1 °C with and without biochar. The average specific methane productions of 0.18 L/g VSadded and 0.17 L/g VSadded were achieved without biochar at the organic loading rate (OLR) of 3.125 and 6.25 g VS/L/d, respectively. An increase of 12% in methane production was obtained in the presence of biochar at the two operational OLRs. Accumulation of propionic acid was observed associating with AD of DCM, which was substantially alleviated by biochar supplement. The buffer capacity of biochar was supposed to develop through strengthening the buffer system established by NH4 + and volatile fatty acids. Methanosarcina that can utilize multiple nutrients for methanogenesis was the dominant archaea in the presence of biochar, while the strictly aceticlastic Methanosaeta was dominant in control digester. These results suggest that biochar enhanced methanogenesis through intensifying its available pathway.