AI Article Synopsis
- Dry anaerobic digestion (dry-AD) can handle high-solid materials but faces challenges like blockages and inhibition, limiting its use.
- Researchers developed new continuous dry co-digestion systems in the lab and pilot stages, analyzing factors like digestate recirculation and the ratio of cow dung to corn straw to improve performance.
- The best results were achieved with a total solids (TS) content of 30%, cow dung to corn straw ratio of 1:3, and a recirculation ratio of 40%, yielding a daily biogas production rate of 0.386 NL/d/g VS, while increasing protein-producing microbes also supported better biogas output.
Article 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.
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| http://dx.doi.org/10.1016/j.biortech.2021.126073 | DOI Listing |
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