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Characteristics of instability and suitable early-warning indicators for cornstalk-fed anaerobic digestion subjected to various sudden changes

Author

Listed:
  • Shen, Ruixia
  • Geng, Tao
  • Yao, Zonglu
  • Yu, Jiadong
  • Luo, Juan
  • Wang, Hongliang
  • Zhao, Lixin

Abstract

In the process of anaerobic digestion (AD), the poor buffer capacity of the system could lead to the imbalance of the supply and demand of methanogens for organic matters, which may subsequently result in the decrease of biogas production, and even the instability of the whole AD system. In this study, key factors of sudden change were simulated based on the frequent instability problems in biogas projects, and subsequent instability properties, early-warning indicators, and microbial community characteristics were investigated. On the whole, the stable early-warning indicators were biogas production rate and content, pH, total alkalinity, bicarbonate alkalinity, and the sum of volatile fatty acids (VFAs). The threshold value of VFAs for AD instability was 10,000 mg/L, under which the biogas production rate reduced from 0.377 to 0.038 L/L/d, CH4 content decreased from 62.8% to 33.6%, and the proportion of Methanosaeta dropped from 74% to 51.6%. Furthermore, Methanosaeta abundance was greatly sensitive to the sudden variation of VFAs, therefore this kind of archaea could be considered as a warning microbial indicator for acid inhibition. There has been an obvious difference in the functional abundances between bacteria and archaea. This study could provide theoretical guidance for stable operation of biogas projects.

Suggested Citation

  • Shen, Ruixia & Geng, Tao & Yao, Zonglu & Yu, Jiadong & Luo, Juan & Wang, Hongliang & Zhao, Lixin, 2023. "Characteristics of instability and suitable early-warning indicators for cornstalk-fed anaerobic digestion subjected to various sudden changes," Energy, Elsevier, vol. 278(C).
    • Handle: RePEc:eee:energy:v:278:y:2023:i:c:s0360544223011295
    DOI: 10.1016/j.energy.2023.127735
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    References listed on IDEAS

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    1. Ao, Tianjie & Chen, Lin & Chen, Yichao & Liu, Xiaofeng & Wan, Liping & Li, Dong, 2021. "The screening of early warning indicators and microbial community of chicken manure thermophilic digestion at high organic loading rate," Energy, Elsevier, vol. 224(C).
    2. Xiao, Youqian & Yang, Hongnan & Zheng, Dan & Liu, Yi & Deng, Liangwei, 2022. "Alleviation of ammonia inhibition in dry anaerobic digestion of swine manure," Energy, Elsevier, vol. 253(C).
    3. Yellezuome, Dominic & Zhu, Xianpu & Wang, Zengzhen & Liu, Ronghou, 2022. "Mitigation of ammonia inhibition in anaerobic digestion of nitrogen-rich substrates for biogas production by ammonia stripping: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).
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    5. Ao, Tianjie & Chen, Lin & Zhou, Pan & Liu, Xiaofeng & Li, Dong, 2021. "The role of oxidation-reduction potential as an early warning indicator, and a microbial instability mechanism in a pilot-scale anaerobic mesophilic digestion of chicken manure," Renewable Energy, Elsevier, vol. 179(C), pages 223-232.
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