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Upgrading current method of anaerobic co-digestion of waste activated sludge for high-efficiency methanogenesis: Establishing direct interspecies electron transfer via ethanol-type fermentation

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  • Zhao, Zhiqiang
  • Sun, Cheng
  • Li, Yang
  • Peng, Hong
  • Zhang, Yaobin

Abstract

Anaerobic co-digestion (AcoD) has been widely applied to the disposal of waste activated sludge (WAS), since it optimizes the C/N ratio and decreases the buffer capacity, which dose not solve the problem involved in the slow methanogenic metabolism that limits methanogenesis yet. In this study, a strategy of initially fermenting the polysaccharide-rich organic wastes to produce the ethanol-contained fermentation liquid (EFL) that was then mixed with WAS for further AcoD was proposed, with the aim of establishing direct interspecies electron transfer (DIET). The results showed that, the methane production rates and organic removal efficiencies in the digesters treating WAS mixed with EFL were significantly higher than that in the single-phase AcoD system about 30% and 6–7%, respectively, but the improved performances in the digesters treating WAS mixed with the neutral-pH fermentation liquid (FL) were not significant, which resulted in a low-efficiency energy recovery. The conductivity of sludge fed with WAS mixed with EFL were about 3–5 folds higher than that with the neutral-pH FL, suggesting that the DIET-based metabolism was established. Together with the special enrichment of Fe(III)-reducing genus involved in Rhodoferax and high-abundance Methanospirillum capable of producing the electrical pili, a novel DIET between Rhodoferax and Methanospirillum was inferred.

Suggested Citation

  • Zhao, Zhiqiang & Sun, Cheng & Li, Yang & Peng, Hong & Zhang, Yaobin, 2020. "Upgrading current method of anaerobic co-digestion of waste activated sludge for high-efficiency methanogenesis: Establishing direct interspecies electron transfer via ethanol-type fermentation," Renewable Energy, Elsevier, vol. 148(C), pages 523-533.
    • Handle: RePEc:eee:renene:v:148:y:2020:i:c:p:523-533
    DOI: 10.1016/j.renene.2019.10.058
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    References listed on IDEAS

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    1. Mata-Alvarez, J. & Dosta, J. & Romero-Güiza, M.S. & Fonoll, X. & Peces, M. & Astals, S., 2014. "A critical review on anaerobic co-digestion achievements between 2010 and 2013," Renewable and Sustainable Energy Reviews, Elsevier, vol. 36(C), pages 412-427.
    2. Nghiem, Long D. & Koch, Konrad & Bolzonella, David & Drewes, Jörg E., 2017. "Full scale co-digestion of wastewater sludge and food waste: Bottlenecks and possibilities," Renewable and Sustainable Energy Reviews, Elsevier, vol. 72(C), pages 354-362.
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    1. Zhao, Zhiqiang & Li, Yang & Zhang, Yaobin, 2021. "Engineering enhanced anaerobic digestion: Benefits of ethanol fermentation pretreatment for boosting direct interspecies electron transfer," Energy, Elsevier, vol. 228(C).
    2. Yu, Qilin & Mao, Haohao & Zhao, Zhiqiang & Zhang, Yaobin, 2023. "Electro-polarization of the sludge with dynamic magnetic field enhanced the interspecies electron transfer in ZVI-added anaerobic digesters," Renewable Energy, Elsevier, vol. 215(C).
    3. Lei Zhu & Jiahou Hao & Houwei Lai & Guibai Li, 2022. "Effects of pH Adjustment on the Release of Carbon Source of Particulate Organic Matter (POM) in Domestic Sewage," Sustainability, MDPI, vol. 14(13), pages 1-15, June.

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