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Evaluation of Novel Inoculation Strategies for Solid State Anaerobic Digestion of Yam Peelings in Low-Tech Digesters

Author

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  • Stefan Heiske

    (Center for BioProcess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark)

  • Linas Jurgutis

    (Center for BioProcess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark)

  • Zsófia Kádár

    (Center for BioProcess Engineering, Department of Chemical and Biochemical Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark)

Abstract

The operation of household scale anaerobic digesters is typically based on diluted animal dung, requiring stabled livestock and adequate water availability. This excludes many rural households in low-income countries from the benefits of a domestic biogas digester. Solid state anaerobic digestion (SSAD) can be operated with low process water demands, but the technology involves operational challenges, as e.g., risk of process acidification or low degradation rates. This study aimed at developing simple methods to perform SSAD of yam peelings in low-tech applications by testing different inoculation strategies and evaluating the necessity of dung addition as a supportive biomass. In initial lab scale trials 143 ± 4 mL CH 4 /g VS (volatile solids) were obtained from a mixture of yam peelings and dung digested in a multi-layer-inoculated batch reactor. In a consecutive incubation cycle in which adapted inoculum was applied, bottom inoculated digesters loaded without dung reached a yield of 140 ± 16 mL CH 4 /g VS. This indicates that SSAD of yam peelings is possible with simple inoculation methods and dung addition is unnecessary after microbial adaptation. A comparison with a conventional fixed dome digester indicated that SSAD can reduce process water demand and the digester volume necessary to supply a given biogas demand.

Suggested Citation

  • Stefan Heiske & Linas Jurgutis & Zsófia Kádár, 2015. "Evaluation of Novel Inoculation Strategies for Solid State Anaerobic Digestion of Yam Peelings in Low-Tech Digesters," Energies, MDPI, vol. 8(3), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:8:y:2015:i:3:p:1802-1816:d:46374
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    References listed on IDEAS

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    2. Karthik Rajendran & Solmaz Aslanzadeh & Mohammad J. Taherzadeh, 2012. "Household Biogas Digesters—A Review," Energies, MDPI, vol. 5(8), pages 1-32, August.
    3. Lichtman, Rob, 1987. "Toward the diffusion of rural energy technologies: Some lessons from the Indian biogas program," World Development, Elsevier, vol. 15(3), pages 347-374, March.
    4. Richard J. Ciotola & Jay F. Martin & Juan M. Castańo & Jiyoung Lee & Frederick Michel, 2013. "Microbial Community Response to Seasonal Temperature Variation in a Small-Scale Anaerobic Digester," Energies, MDPI, vol. 6(10), pages 1-18, October.
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    1. Sun, Hui & Wang, Enzhen & Li, Xiang & Cui, Xian & Guo, Jianbin & Dong, Renjie, 2021. "Potential biomethane production from crop residues in China: Contributions to carbon neutrality," Renewable and Sustainable Energy Reviews, Elsevier, vol. 148(C).
    2. Siswo Sumardiono & Gebyar Adisukmo & Muthia Hanif & Budiyono Budiyono & Heri Cahyono, 2021. "Effects of Pretreatment and Ratio of Solid Sago Waste to Rumen on Biogas Production through Solid-State Anaerobic Digestion," Sustainability, MDPI, vol. 13(13), pages 1-11, July.

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