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Effect of seed sludge source and start-up strategy on the performance and microbial communities of thermophilic anaerobic digestion of food waste

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  • Lim, Jun Wei
  • Kelvin Wong, Sheng Wen
  • Dai, Yanjun
  • Tong, Yen Wah

Abstract

The objective of this study was to determine the effect of seed sludge on the start-up of thermophilic anaerobic digestion (AD) and to compare two methods of converting mesophilic to thermophilic consortium. Seed sludge source played an important role in the start-up while one-step temperature increase was the preferred start-up strategy. Biogas yields, pH and VFA levels of step-wise temperature increase reactors were initially comparable to that of the mesophilic control. However, they showed signs of instability and failure after temperature exceeded 50 °C. A great increase in absolute abundance of bacteria but reduced archaea for step-wise temperature increase reactors likely resulted in the over-supply of AD intermediates which were not consumed in time by methanogens, causing reactor souring. An initial drop in biogas and significant VFA accumulation were observed by one-step temperature increase reactors. However, owing to the successful acclimatization of thermophilic bacteria – Thermotogae, Thermoanaerobacterales, and Thermoanaerobacterium, as well as Methanosarcina, the one-step temperature increase reactor recovered from VFA accumulation and poor biogas yield within 10 days. By adopting the one-step temperature increase strategy and a suitable seed sludge, microbial consortia for thermophilic AD was established effectively, which aided the start-up of thermophilic AD of food waste.

Suggested Citation

  • Lim, Jun Wei & Kelvin Wong, Sheng Wen & Dai, Yanjun & Tong, Yen Wah, 2020. "Effect of seed sludge source and start-up strategy on the performance and microbial communities of thermophilic anaerobic digestion of food waste," Energy, Elsevier, vol. 203(C).
    • Handle: RePEc:eee:energy:v:203:y:2020:i:c:s036054422031029x
    DOI: 10.1016/j.energy.2020.117922
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    References listed on IDEAS

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    1. Zhang, Jingxin & Loh, Kai-Chee & Li, Wangliang & Lim, Jun Wei & Dai, Yanjun & Tong, Yen Wah, 2017. "Three-stage anaerobic digester for food waste," Applied Energy, Elsevier, vol. 194(C), pages 287-295.
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    1. Masala, Fabiana & Groppi, Daniele & Nastasi, Benedetto & Piras, Giuseppe & Astiaso Garcia, Davide, 2022. "Techno-economic analysis of biogas production and use scenarios in a small island energy system," Energy, Elsevier, vol. 258(C).
    2. Wu, Wei & Chen, Guang & Wang, Zhiwei, 2022. "Enhanced sludge digestion using anaerobic dynamic membrane bioreactor: Effects of hydraulic retention time," Energy, Elsevier, vol. 261(PB).
    3. Guo, Xiaobo & Chen, Huize & Zhu, Xianqing & Xia, Ao & Liao, Qiang & Huang, Yun & Zhu, Xun, 2021. "Revealing the role of conductive materials on facilitating direct interspecies electron transfer in syntrophic methanogenesis: A thermodynamic analysis," Energy, Elsevier, vol. 229(C).
    4. Xiao, Benyi & Tang, Xinyi & Zhang, Wenzhe & Zhang, Ke & Yang, Tang & Han, Yunping & Liu, Junxin, 2022. "Effects of rice straw ratio on mesophilic and thermophilic anaerobic co-digestion of swine manure and rice straw mixture," Energy, Elsevier, vol. 239(PB).

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