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Saponification with calcium enhanced methane yield in anaerobic digestion of fat, oil, and grease: The essential role of calcium

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  • Wu, Kun
  • Xu, Weijia
  • Lu, Jian
  • Wang, Chun
  • Liao, Jinhui
  • He, Xia

Abstract

Though saponification between calcium and fat, oil, and grease (FOG) could reduce inhibition caused by long chain fatty acids (LCFAs) in anaerobic digestion of FOG, the role of calcium in methane recovery is not well understood. In this study, different calcium sources (CaSO4, Ca(OH)2 and CaCl2) and mole ratios of Ca2+/LCFAs (0.25, 0.5 and 1) were chosen to investigate the role of calcium in anaerobic digestion of FOG. Compared to CaCl2/CaSO4, Ca(OH)2 was the most suitable calcium source due to the highest fraction of saponification in the calcium soaps as well as the 22% increment of methane production. For the reactors using CaCl2/CaSO4 as calcium source, Ca2+/LCFAs = 0.25 is preferred to enhance methane production, and the adsorption of the released LCFAs from calcium soaps onto biomass might be the primary pattern of LCFA degradation. Regarding the reactors using Ca(OH)2 as calcium source, Ca2+/LCFAs = 0.5 is beneficial for the enhancement of methane yield, and the combination of bio-aggregation on calcium soap and adsorption of released LCFAs on biomass may be the explanation for the relatively high methane production. Different calcium source and Ca2+/LCFAs could primarily affect the composition of syntrophs and methanogens, leading to different methane recovery from anaerobic digestion of FOG.

Suggested Citation

  • Wu, Kun & Xu, Weijia & Lu, Jian & Wang, Chun & Liao, Jinhui & He, Xia, 2022. "Saponification with calcium enhanced methane yield in anaerobic digestion of fat, oil, and grease: The essential role of calcium," Renewable Energy, Elsevier, vol. 195(C), pages 1103-1112.
    • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:1103-1112
    DOI: 10.1016/j.renene.2022.06.055
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    References listed on IDEAS

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    1. Montefrio, Marvin Joseph & Xinwen, Tai & Obbard, Jeffrey Philip, 2010. "Recovery and pre-treatment of fats, oil and grease from grease interceptors for biodiesel production," Applied Energy, Elsevier, vol. 87(10), pages 3155-3161, October.
    2. Liu, Yang & He, Pinjing & Duan, Haowen & Shao, Liming & Lü, Fan, 2021. "Low calcium dosage favors methanation of long-chain fatty acids," Applied Energy, Elsevier, vol. 285(C).
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    1. Li, Xinxin & Han, Ruirui & Song, Chuang & Liu, Yanping, 2022. "Preparation of polyvinyl alcohol-calcium sustained-release agent employed to degrade long-chain fatty acids and improve the performance of anaerobic digestion of food waste," Renewable Energy, Elsevier, vol. 199(C), pages 653-661.
    2. Thakur, Nandini & Jalalah, Mohammed & Alsareii, Saeed A. & Harraz, Farid A. & Almadiy, Abdulrhman A. & Su, Shaochen & Salama, El-Sayed & Li, Xiangkai, 2024. "Anaerobic digestion of fat, oil, and grease (FOG) under combined additives: Enhanced digestibility, biogas production, and microbiome," Renewable and Sustainable Energy Reviews, Elsevier, vol. 191(C).

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