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Enhancing Agricultural Biogas Desulfurization: Improving Cost-Efficiency and Robustness Through Micro-Aeration with Psychrophilic Anaerobic Liquid/Solid Media

Author

Listed:
  • Rajinikanth Rajagopal

    (Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, QC J1M 0C8, Canada)

  • Bernard Goyette

    (Sherbrooke Research and Development Centre, Agriculture and Agri-Food Canada, 2000 College Street, Sherbrooke, QC J1M 0C8, Canada)

Abstract

This study endeavors to develop an economical and user-friendly biological sulfide oxidation system and explore its mechanism for generating biological elemental sulfur under micro-aerobic conditions using psychrophilic anaerobically digested media (liquid/solid inoculums obtained from agricultural livestock wastes) for sulfide-free biogas production. With an initial hydrogen sulfide concentration of 5000 ppm, a biogas flow rate ranging from 0.9 to 1.8 L/h-L inoculum-mix , and an air injection rate of 0.6–1% (oxygen concentration in biogas), a remarkable biodesulfurization efficiency of 99–100% was attained using solid inoculum as the biodesulfurization medium. This efficiency was achieved without compromising the methane quality in the treated biogas. Compared to liquid inoculum, solid inoculum requires less than half the volume and no mixing equipment, such as bubble column reactors. The biodesulfurization reactor requires only 1 m 3 , which is approximately 1.5% of the volume of a wet anaerobic digester and 3% of a dry anaerobic digester, while processing cow manure (Total Solids: 20%) at 1.03 m 3 of manure per day. Moreover, it can be operated at (19–20 °C), leading to substantial reductions in cost and footprint.

Suggested Citation

  • Rajinikanth Rajagopal & Bernard Goyette, 2024. "Enhancing Agricultural Biogas Desulfurization: Improving Cost-Efficiency and Robustness Through Micro-Aeration with Psychrophilic Anaerobic Liquid/Solid Media," Agriculture, MDPI, vol. 14(12), pages 1-17, November.
    • Handle: RePEc:gam:jagris:v:14:y:2024:i:12:p:2113-:d:1527094
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    References listed on IDEAS

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    1. Wang, Xiaojiao & Lu, Xingang & Yang, Gaihe & Feng, Yongzhong & Ren, Guangxin & Han, Xinhui, 2016. "Development process and probable future transformations of rural biogas in China," Renewable and Sustainable Energy Reviews, Elsevier, vol. 55(C), pages 703-712.
    2. Massé, Daniel I. & Rajagopal, Rajinikanth & Singh, Gursharan, 2014. "Technical and operational feasibility of psychrophilic anaerobic digestion biotechnology for processing ammonia-rich waste," Applied Energy, Elsevier, vol. 120(C), pages 49-55.
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