Establishing practical strategies to run high loading corn stover anaerobic digestion: Methane production performance and microbial responses

Haipeng Wang, Jiawei Li, Yiquan Zhao, Congfeng Xu, Keqiang Zhang, Jiajia Li, Lei Yan, Ji Dong Gu, Dan Wei, Weidong Wang*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

It is significant to understand corn stover (CS) in anaerobic digestion (AD) under high organic loadings. A semi-continuous mesophilic (37 ± 1 °C) CS AD was conducted in this study with increasing loadings. The initial total solids (TS) gradually increased with 1% gradient at every 10 days from 8% to 15% until the system was acidified. Adding different ratios of cattle manure (CM) (20%, 30% and 40% (v/v)) to rescue this system back to a stable operation was adopted. The diversity of bacteria and archaea was analyzed by 16S rRNA gene sequencing technology. The results showed that when loading TS content was increased to 15%, AD system was acidized with pH value of 5.13. 30% of CM was the optimal ratio to recover biogas production. High abundance (31.07%) of Bathyarchaeota was first found in AD system. Acidification of high loading CS AD can be highly correlating with bacterial community, specially Clostridium and Caproiciproducens.

Original languageEnglish
Article number123364
JournalBioresource Technology
Volume310
DOIs
StatePublished - Aug 2020
Externally publishedYes

Keywords

  • Acidification
  • Anaerobic digestion
  • Corn stover
  • Microbial diversity
  • Organic loading

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