Recognition of core microbial communities contributing to complex organic components degradation during dry anaerobic digestion of chicken manure

• Published in: Bioresource technology 2020-10, Vol.314, p.123765-123765, Article 123765
• Main Authors: Li, Xiang, Zhao, Xiuyun, Yang, Jinjin, Li, Shaokang, Bai, Sicong, Zhao, Xinyu
• Format: Article
• Language: English
• Subjects: Content variation; Dry anaerobic digestion; Microbial community; Organic components
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2020.123765

[Display omitted] •The microflora related to organic matter conversion during dry AD was identified.•The species of microbes for degradation were the most in the hydrolysis stage.•The degradation rate of hemicellulose was the highest in the process of dry AD.•Increasing the content of protein could improve methane production. Microbial metabolism of complex organic components can drive different microbial communities, which is significant to the process of dry anaerobic digestion (AD). However, possible mechanisms between organic components and the corresponding microbial communities during the process of dry AD is poorly investigated. Results showed that the microbial species affecting the degradation of organic components were 69 nodes (13.3%) in the hydrolysis stage, hemicellulose was mainly degraded by Methanobacterium (2.3%), with a degradation rate of 35.0%. In the acetogenesis stage, the microbial species were 27 nodes (10.3%), hemicellulose was mainly degraded by LK-44f (0.1%) and Treponema (0.3%), with a degradation rate of 52.2%. In the methanogenesis stage, the microbial species were 10 nodes (4.8%), polysaccharide was mainly degraded by Ureibacillus (0.1%), with a degradation rate of 46.9%. The study provides theoretical support for the rapid degradation of complex components by segment-oriented regulation.