Improving methane yield from organic fraction of municipal solid waste (OFMSW) with magnetic rice-straw biochar

• Published in: Bioresource technology Vol. 245; no. Pt A; pp. 1058 - 1066
• Main Authors: Qin, Yong, Wang, Haoshu, Li, Xiangru, Cheng, Jay Jiayang, Wu, Weixiang
• Format: Journal Article
• Language: English
• Published: England Elsevier Ltd 01.12.2017
• Subjects: Anaerobic digestion (AD); Anaerobiosis; Bioreactors; Charcoal; Magnetic biochar; Methane; Methanogens; Organic fraction of municipal solid waste (OFMSW); Oryza; Refuse Disposal; Solid Waste; Anaerobic digestion (AD); Organic fraction of municipal solid waste (OFMSW); Magnetic biochar; Methanogens
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2017.09.047

•Appropriate precursor concentration for magnetic biochar led to the improvement of methane production.•Microorganisms participating in anaerobic digestion were enriched on magnetic biochar.•Magnetic biochar offers a solution for preventing methanogens loss in anaerobic digesters. Magnetic biochar is a potential economical anaerobic digestion (AD) additive. To better understand the possible role of magnetic biochar for the improvement of biomethanization performance and the retention of methanogens, magnetic biochar fabricated under different precursor concentrations were introduced into organic fraction of municipal solid waste (OFMSW) slurry AD system. Results showed that methane production in AD treatment with magnetic biochar fabricated under 3.2g FeCl3:100g rice-straw ratio increased by 11.69% compared with control treatment without biochar addition, due to selective enrichment of microorganisms participating in anaerobic digestion on magnetic biochar. AD treatment with magnetic biochar fabricated under 32g FeCl3:100g rice-straw ratio resulted in 38.34% decreasement of methane production because of the competition of iron oxide for electron. Furthermore, 25% of total methanogens were absorbed on magnetic biochar and can be harvested with magnet, which can offer a potential solution for preventing the methanogens loss in the anaerobic digesters.