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Impact of continuous leachate recirculation during solid state anaerobic digestion of Miscanthus

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  • Li, Chao
  • Tao, Yu
  • Fang, Jun
  • Li, Qiang
  • Lu, Wenjing

Abstract

Continuous leachate recirculation was performed in a solid-state anaerobic digestion (SS-AD) in an attempt to enhance and improve the biogas (methane) production from Miscanthus sp. Furthermore, microbial community dynamics was analysed, and liaised with the process performance and stability. Results showed that the SS-AD process without leachate recirculation showed significantly higher degradation degree of cellulose/hemicellulose (35% higher) as well as methane yield (65% higher) compared to the leachate recirculation processes. Continuous recirculation led to the transpose of active microbial groups from the main reactor to the leachate holding vessel, a condition which could be attributed to the poor degradation efficiency. Therefore, for the enhancement of biogas production in a SS-AD of structural mono-substrate with leachate recirculated process, the recirculation speed should be carefully chosen and optimized to minimize the disturbance and wash-out of the viable microbial consortium.

Suggested Citation

  • Li, Chao & Tao, Yu & Fang, Jun & Li, Qiang & Lu, Wenjing, 2020. "Impact of continuous leachate recirculation during solid state anaerobic digestion of Miscanthus," Renewable Energy, Elsevier, vol. 154(C), pages 38-45.
    • Handle: RePEc:eee:renene:v:154:y:2020:i:c:p:38-45
    DOI: 10.1016/j.renene.2020.02.104
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    1. Di Maria, Francesco & Sordi, Alessio & Micale, Caterina, 2012. "Optimization of Solid State Anaerobic Digestion by inoculum recirculation: The case of an existing Mechanical Biological Treatment plant," Applied Energy, Elsevier, vol. 97(C), pages 462-469.
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    1. El Ibrahimi, Mohammed & Khay, Ismail & El Maakoul, Anas & Bakhouya, Mohamed, 2022. "Effects of the temperature range on the energy performance of mixed and unmixed digesters with submerged waste: An experimental and CFD simulation study," Renewable Energy, Elsevier, vol. 200(C), pages 1092-1104.

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