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Integrated anaerobic digestion and CO2 sequestration for energy recovery from waste activated sludge by calcium addition: Timing matters

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  • Yin, Changkai
  • Shen, Yanwen
  • Dai, Xiaohu
  • Zhu, Nanwen
  • Yuan, Haiping
  • Lou, Ziyang
  • Yuan, Rongxue

Abstract

Anaerobic digestion (AD) with in-situ biogas upgrading is a technology that integrates methane production and selective CO2 sequestration in a one-pot process. This study investigated the effect of Ca2+ addition timing on thermophilic AD of waste activated sludge (WAS). CaCl2 solution was added to the digester on day 0, 2, 4, 6 and 8 at concentration of 3000 mg∙L−1. Ca2+ addition on day 4, after which exponential methane production started, achieved the best AD performance with cumulative CH4 production, maximum CH4 potential and maximum CH4 production rate increased by 20.8%, 20.8% and 50.2%, respectively. This treatment also remarkably reduced free ammonia inhibition and enhanced Methanosarcina abundance in the digester. A substantial increase (up to 58.4%) in the gas-phase CH4 to CO2 molar ratio was observed in the Ca2+-supplemented digesters, demonstrating the effectiveness of Ca2+ addition for CO2 sequestration. The relative change in the CH4 to gross CO2 ratio indicated the promoted hydrogenotrophic methanogenesis, possibly as a pertinent microbial mechanism behind the improved methane production.

Suggested Citation

  • Yin, Changkai & Shen, Yanwen & Dai, Xiaohu & Zhu, Nanwen & Yuan, Haiping & Lou, Ziyang & Yuan, Rongxue, 2020. "Integrated anaerobic digestion and CO2 sequestration for energy recovery from waste activated sludge by calcium addition: Timing matters," Energy, Elsevier, vol. 199(C).
    • Handle: RePEc:eee:energy:v:199:y:2020:i:c:s0360544220305284
    DOI: 10.1016/j.energy.2020.117421
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    References listed on IDEAS

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    1. Zhao, Jiamin & Hou, Tingting & Wang, Qian & Zhang, Zhenya & Lei, Zhongfang & Shimizu, Kazuya & Guo, Wenshan & Ngo, Huu Hao, 2021. "Application of biogas recirculation in anaerobic granular sludge system for multifunctional sewage sludge management with high efficacy energy recovery," Applied Energy, Elsevier, vol. 298(C).

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