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Enhancing Biogas Production of Corn Stover by Biogas Slurry Reflux Based on Microfiltration Membrane Filtration and Biochar Adsorption

Author

Listed:
  • Xiaohong Su

    (Renewable Energy Research Center, Heilongjiang Institute of Energy and Environment, Haerbin 150000, China)

  • Jingbo Qu

    (College of Engineering, Northeast Agricultural University, Haerbin 150030, China)

  • Yan Huang

    (Key Laboratory of Development and Application of Rural Renewable Energy, Ministry of Agriculture, Chengdu 610041, China)

  • Wei Liu

    (Renewable Energy Research Center, Heilongjiang Institute of Energy and Environment, Haerbin 150000, China)

  • Yong Sun

    (College of Engineering, Northeast Agricultural University, Haerbin 150030, China)

Abstract

Reflux of biogas slurry is an effective way to reduce the discharge of wastewater. In order to improve the utilization efficiency of reflux fluid and reduce ammonia inhibition in an anaerobic digestion (AD) system, biogas slurry was pretreated by microfiltration membrane and biochar adsorption. In this study, the suspension solid (SS), biochemical oxygen demand (COD) and ammonia nitrogen (NH 4 + -N) were investigated, as well as the gas production effect of the reflux of biogas slurry in AD, so as to evaluate the filtration effect of the microfiltration membrane with different pore sizes and the adsorption effect of biochar with different dosages. The results showed that 0.65 μm microfiltration had the best interaction effect and 7 g/L biochar had the best adsorption effect. The results of anaerobic co-digestion of the biogas slurry and corn stover showed the peak gas production of the pretreated reflux fluid was advanced by 1 day, and the maximum daily methane production and maximum cumulative methane production reached 39.20 mL·g −1 VS and 137.14 mL·g −1 VS, respectively. These results indicated that the combined treatment of biogas slurry by microfiltration membrane and biochar could have potential applications for the treatment and recycling of biogas slurry.

Suggested Citation

  • Xiaohong Su & Jingbo Qu & Yan Huang & Wei Liu & Yong Sun, 2022. "Enhancing Biogas Production of Corn Stover by Biogas Slurry Reflux Based on Microfiltration Membrane Filtration and Biochar Adsorption," Agriculture, MDPI, vol. 12(12), pages 1-14, November.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:12:p:2040-:d:987226
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    References listed on IDEAS

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    1. Yajun Chang & Huijun Zhao & Linhe Sun & Jian Cui & Jixiang Liu & Qiang Tang & Fengfeng Du & Xiaojing Liu & Dongrui Yao, 2022. "Resource Utilization of Biogas Waste as Fertilizer in China Needs More Inspections Due to the Risk of Heavy Metals," Agriculture, MDPI, vol. 12(1), pages 1-15, January.
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