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Acyl homoserine lactone-based regulation strategy for improved methane production in anaerobic digestion of agricultural wastes

Author

Listed:
  • Liu, Yang
  • Zhao, Wanqi
  • Xi, Yonglan
  • Wang, Shen
  • Liang, Jinhua
  • Zeng, Yang
  • Dong, Weiliang
  • Chen, Kequan
  • Jia, Honghua
  • Wu, Xiayuan

Abstract

The acyl homoserine lactone (AHL)-based regulation strategy presents a considerable potential in improving anaerobic digestion (AD) efficiency of complex substrates. However, the reinforcement mechanisms are still unclear. In this study, the effects of different AHL types (C4-HSL, C7-HSL, C12-HSL) and different adding times (0 d, 5 d, 15 d) on AD performance of agricultural wastes (corn straw and cattle manure) were investigated. The results indicated that all types of AHLs exerted positive effects on AD, and the adding time rather than the AHL type was the key factor affecting AD processes. The C12-5d group obtained the highest accumulated methane production (310.7 ± 2.56 mL/g VS), which increased by 47.71% than that of the Control group. The exogenous AHLs facilitated the hydrolysis and acidification of complex substrates and the utilization of released low-molecular-weight organic acids in AD systems. Furthermore, the role of methanogenic archaea was upregulated and the dominance of bacteria was relatively weakened in AD systems, which favored the establishment of their balanced and symbiotic metabolic relationship. The enriched Methanobacterium strengthened the hydrogenotrophic methanogenesis pathway. This study provides new insights into the regulation strategy of AD for agricultural waste treatment based on AHL addition.

Suggested Citation

  • Liu, Yang & Zhao, Wanqi & Xi, Yonglan & Wang, Shen & Liang, Jinhua & Zeng, Yang & Dong, Weiliang & Chen, Kequan & Jia, Honghua & Wu, Xiayuan, 2024. "Acyl homoserine lactone-based regulation strategy for improved methane production in anaerobic digestion of agricultural wastes," Applied Energy, Elsevier, vol. 358(C).
    • Handle: RePEc:eee:appene:v:358:y:2024:i:c:s0306261924000047
    DOI: 10.1016/j.apenergy.2024.122621
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    References listed on IDEAS

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