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Enhancing methanogenesis efficiency in anaerobic digestion of food waste through incremental salinity and nanobubble utilization to domesticate inoculum: Adaptability and optimal inoculation ratios

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  • Hou, Tingting
  • Jiao, Youzhou
  • Zhao, Jiamin
  • Zhang, Zhenya
  • Lei, Zhongfang
  • Xu, Guizhuan
  • Pan, Xiaohui
  • Li, Pengfei
  • Petracchini, Francesco
  • He, Chao

Abstract

High salinity inhibits methane production in food waste (FW) anaerobic digestion (AD). This study investigated the salinity tolerance (1 %–3 %) of inoculum acclimated with air nanobubble water (Air-NBW) and evaluated methanogenic potential under 3 % salinity across varying inoculum-to-substrate (I/S) ratios (volatile solids (VS) basis). As results, the methane yield of the Air-NBW group significantly increased by 31 %, 18 %, and 16 % (p < 0.05 for all phases) relative to the control group across the three phases. Remarkably, the lag period in the Air-NBW group exhibited a notable reduction as the salinity increased, particularly at the salinity of 2 % where a significant decrease of 14 days in the lag period was observed in comparison to the control group. Additionally, the Air-NBW digester showed a non-significant increase in methane yield (228.88 ± 4.36 mL/g-VSfed, p = 0.061) at I/S = 1, while demonstrating a significant increase to 307.45 ± 3.77 mL/g-VSfed at I/S = 0.5 (p = 0.007 < 0.05) compared to the DW groups at equivalent I/S ratios. These results indicate that the using a salinity-adaptable inoculum could effectively facilitate the swift initiation and sustained stability of FW digesters.

Suggested Citation

  • Hou, Tingting & Jiao, Youzhou & Zhao, Jiamin & Zhang, Zhenya & Lei, Zhongfang & Xu, Guizhuan & Pan, Xiaohui & Li, Pengfei & Petracchini, Francesco & He, Chao, 2025. "Enhancing methanogenesis efficiency in anaerobic digestion of food waste through incremental salinity and nanobubble utilization to domesticate inoculum: Adaptability and optimal inoculation ratios," Renewable Energy, Elsevier, vol. 249(C).
    • Handle: RePEc:eee:renene:v:249:y:2025:i:c:s0960148125009206
    DOI: 10.1016/j.renene.2025.123258
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    References listed on IDEAS

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    1. Gandhi, Bhushan P. & Otite, Saanu Victoria & Fofie, Esther A. & Lag-Brotons, Alfonso José & Ezemonye, Lawrence I. & Semple, Kirk T. & Martin, Alastair D., 2022. "Kinetic investigations into the effect of inoculum to substrate ratio on batch anaerobic digestion of simulated food waste," Renewable Energy, Elsevier, vol. 195(C), pages 311-321.
    2. Xiaofeng Li & Jingjing Huang & Yiyun Liu & Tao Huang & Claudia Maurer & Martin Kranert, 2019. "Effects of Salt on Anaerobic Digestion of Food Waste with Different Component Characteristics and Fermentation Concentrations," Energies, MDPI, vol. 12(18), pages 1-14, September.
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    1. Yuan, Yongkang & Hou, Tingting & Li, Pengfei & Sun, Hui & Jiao, Youzhou & Li, Gang & He, Chao, 2026. "Enhancing semi-continuous anaerobic digestion efficiency with nanobubble water: thermophysical properties optimization and microbial regulation," Renewable Energy, Elsevier, vol. 258(C).

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