Engineering and microbial characteristics of innovative lab and pilot continuous dry anaerobic co-digestion system fed with cow dung and corn straw. (December 2021)

• Record Type: Journal Article
• Authors: Shen, Ruixia; Chen, Runlu; Yao, Zonglu; Feng, Jing; Yu, Jiadong; Li, Zaixing; Luo, Juan; Zhao, Lixin
• Is Part Of: Bioresource technology. Volume 342(2021)
• Publication Date: 2021-12
• Subjects: Continuous -- Pilot-scale -- Dry anaerobic co-digestion -- Parameter optimization -- Digestate viscosity; 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.2021.126073
• Languages: English
• ISSNs: 0960-8524

Abstract

Graphical abstract: Highlights: Continuous lab and pilot dry co-digestion system was investigated systematically. Factor effects were ranked as follows: TS > CD:CS > digestate recirculation ratio. The biogas production rate reached 3.0 L·L -1 ·d -1 with optimal parameters. The increase of CD:CS and TS content inhibited the biogas production. Proteiniphilum and acetoclastic methanogens could facilitate biogas production. Abstract: Dry anaerobic digestion (dry-AD) allows high-solid digestion; however, dry-AD application is limited because it is prone to blockage and intermediate inhibition. Here, we reported innovative continuous dry co-digestion systems at both lab and pilot scales. The effects of digestate recirculation ratio, dry mass ratio of cow dung to corn straw (CD:CS), and TS content on the digestion performance were investigated. The effects of the three factors were ranked as follows: TS content > CD:CS > digestate recirculation ratio. The daily biogas production rate reached 0.386 NL/d/g VS with the optimal parameter combination, which was determined to be TS content of 30%, a substrate ratio of 1:3, and a digestate recirculation ratio of 40%. In addition, increasing the CD:CS and TS content increased digestate viscosity, which inhibited biogas production; however, increased abundance of Proteiniphilum and acetoclastic methanogens facilitated biogas production. This study provides empirical support for further application of dry-AD.