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Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons

Author

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  • Charlotte Rennuit

    (Biotechnology and Environmental Engineering, Institute of Chemical Engineering, Faculty of Engineering, University of Southern Denmark (SDU), Odense M 5230, Denmark)

  • Sven Gjedde Sommer

    (Biotechnology and Environmental Engineering, Institute of Chemical Engineering, Faculty of Engineering, University of Southern Denmark (SDU), Odense M 5230, Denmark)

Abstract

Biogas production is a clean renewable energy source that can improve lives in developing countries. However, winter temperatures in some areas are too low to enable enough biogas production in small unheated digesters to meet the energy requirements of households. Low-cost, high yield reactors adapted to the local climate are needed in those situations. A decision-support model was developed to assist in the design of biogas reactors capable of meeting households’ year-round energy needs. Monthly biogas production relative to household energy needs was calculated for the scenario of suburban Hanoi, Vietnam. Calculations included pig number, slurry (manure water mixture) dilution, retention time and biogas/solar heating. Although using biogas to heat the digester increased biogas production, it did not lead to an energy surplus, particularly with the 1:9 slurry dilution rate commonly used on pig farms. However, at a 1:3 slurry dilution, the use of solar heating to provide 90% and biogas 10% of the heat required to heat the digester to 35 °C improved the biogas production by 50% compared to psychrophilic production. The energy needs of an average five-person family throughout the year required 17 fattening pigs. This model can establish the best solution for producing sufficient energy throughout the year.

Suggested Citation

  • Charlotte Rennuit & Sven Gjedde Sommer, 2013. "Decision Support for the Construction of Farm-Scale Biogas Digesters in Developing Countries with Cold Seasons," Energies, MDPI, vol. 6(10), pages 1-19, October.
    • Handle: RePEc:gam:jeners:v:6:y:2013:i:10:p:5314-5332:d:29669
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    References listed on IDEAS

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    3. Dawson, C.J. & Hilton, J., 2011. "Fertiliser availability in a resource-limited world: Production and recycling of nitrogen and phosphorus," Food Policy, Elsevier, vol. 36(S1), pages 14-22.
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    Cited by:

    1. Ashish Kumar Karmaker & Md. Alamgir Hossain & Nallapaneni Manoj Kumar & Vishnupriyan Jagadeesan & Arunkumar Jayakumar & Biplob Ray, 2020. "Analysis of Using Biogas Resources for Electric Vehicle Charging in Bangladesh: A Techno-Economic-Environmental Perspective," Sustainability, MDPI, vol. 12(7), pages 1-19, March.
    2. Luo, Tao & Khoshnevisan, Benyamin & Pan, Junting & Ge, Yihong & Mei, Zili & Xue, Jian & Fu, Yanran & Liu, Hongbin, 2020. "How exothermic characteristics of rice straw during anaerobic digestion affects net energy production," Energy, Elsevier, vol. 212(C).

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