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Anaerobic Co-Digestion of Pig Manure and Rice Straw: Optimization of Process Parameters for Enhancing Biogas Production and System Stability

Author

Listed:
  • Pengjiao Tian

    (College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China
    These authors contributed equally to this work.)

  • Binbin Gong

    (College of Life Science, Xingtai University, Xingtai 054001, China
    These authors contributed equally to this work.)

  • Kaijian Bi

    (College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China)

  • Yuxin Liu

    (Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China)

  • Jing Ma

    (Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China)

  • Xiqing Wang

    (College of Food Science and Technology, Hubei University of Arts and Science, Xiangyang 441053, China)

  • Zhangsun Ouyang

    (Jiangxi Rural Energy and Enviroment Agency, Nanchang 330031, China)

  • Xian Cui

    (State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China)

Abstract

The objective of this study was to optimize the process parameters of the anaerobic co-digestion of pig manure and rice straw to maximize methane production and system stability. In this study, batch experiments were conducted with different mixing ratios of pig manure and rice straw (1:0, 1:1, 1:5, 1:10, and 0:1), total solid concentrations (6%, 8%, 10%, 12%, and 14%), and inoculum accounts (5%, 10%, 15%, 20%, and 25%). The results show that a 1:5 mixing ratio of pig manure to rice straw, a 12% total solid content, and a 15% inoculum account yielded biogas up to 553.79 mL/g VS, which was a result of co-digestion increasing the cooperative index (CPI > 1). Likewise, the evolution of the pH and VFAs indicated that the co-digestion system was well-buffered and not easily inhibited by acidification or ammonia nitrogen. Moreover, the results of the Gompertz model’s fitting showed that the cumulative methane production, delay period, effective methane production time, and methane production rate under optimal conditions were significantly superior compared to the other groups employed.

Suggested Citation

  • Pengjiao Tian & Binbin Gong & Kaijian Bi & Yuxin Liu & Jing Ma & Xiqing Wang & Zhangsun Ouyang & Xian Cui, 2023. "Anaerobic Co-Digestion of Pig Manure and Rice Straw: Optimization of Process Parameters for Enhancing Biogas Production and System Stability," IJERPH, MDPI, vol. 20(1), pages 1-14, January.
    • Handle: RePEc:gam:jijerp:v:20:y:2023:i:1:p:804-:d:1022140
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    References listed on IDEAS

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    1. Wang, Zixin & Wang, Tengfei & Si, Buchun & Watson, Jamison & Zhang, Yuanhui, 2021. "Accelerating anaerobic digestion for methane production: Potential role of direct interspecies electron transfer," Renewable and Sustainable Energy Reviews, Elsevier, vol. 145(C).
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    Cited by:

    1. Maurizio Bressan & Elena Campagnoli & Carlo Giovanni Ferro & Valter Giaretto, 2023. "A Mass Balance-Based Method for the Anaerobic Digestion of Rice Straw," Energies, MDPI, vol. 16(11), pages 1-19, May.
    2. Otton K. Roubinek & Anna Wilinska-Lisowska & Magdalena Jasinska & Andrzej G. Chmielewski & Krzysztof Czerwionka, 2023. "Production of Biogas from Distillation Residue as a Waste Material from the Distillery Industry in Poland," Energies, MDPI, vol. 16(7), pages 1-15, March.

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