Anaerobic co-digestion of corn stover and wastewater from hydrothermal carbonation

• Published in: Bioresource technology 2020-11, Vol.315, p.123788-123788, Article 123788
• Main Authors: Wang, Fang, Yi, Weiming, Zhang, Deli, Liu, Yi, Shen, Xiuli, Li, Yongjun
• Format: Article
• Language: English
• Subjects: Anaerobic co-digestion; Corn stover; Furfural degradation; Methane enhancement; Microbial community; Wastewater of hydrothermal carbonation
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2020.123788

[Display omitted] •The co-digestion of W-HTC and CS enhanced CH4 production of the two feedstocks.•Negative effect of phenols on CH4 production is significantly more than furans.•The growth of Clostridia and Bacteroidia is promoted by appropriate W-HTC.•Co-existence of CS and W-HTC promoted the growth of Methanomassiliicoccus in AD. This study aimed to investigate the interactions between wastewater of hydrothermal carbonation (W-HTC) and corn stover (CS) during anaerobic co-digestion. The results showed the maximum cumulative methane production of co-digestion was 280.7 ± 3.2 mL/g VS, and it increased by 5.84% and 10.69% compared with mono-digestion of CS and W-HTC, respectively. Increasing the HTC temperature and excess addition of W-HTC inhibits early and middle stage of co-digestion due to toxic organic inhibitors, and the negative effect of phenols is substantially more than furans. The microbial analysis illustrated the addition of W-HTC can promote the growth of Clostridia and Bacteroidia. The growth of Methanomassiliicoccus and Methanosarcina was more vigorous in most of co-digestions, which was positively correlated with methane production. The study concluded methanogenesis can be enhanced by the co-digestion of W-HTC and CS, which provide optimization of process conditions and some reaction mechanism for application of W-HTC in anaerobic digestion.