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Anaerobic Co-Digestion of Sludge and Organic Food Waste—Performance, Inhibition, and Impact on the Microbial Community

Author

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  • Alexander Keucken

    (Vatten & Miljö i Väst AB, P.O. Box 110, SE-311 22 Falkenberg, Sweden
    Water Resources Engineering, Faculty of Engineering, Lund University, P.O. Box 118, SE-221 00 Lund, Sweden)

  • Moshe Habagil

    (Vatten & Miljö i Väst AB, P.O. Box 110, SE-311 22 Falkenberg, Sweden)

  • Damien Batstone

    (Advanced Water Management Centre, The University of Queensland, Brisbane 4072, QLD, Australia)

  • Ulf Jeppsson

    (Department of Biomedical Engineering (BME), Division of Industrial Electrical Engineering and Automation (IEA), Lund University, P.O. Box 118, SE-221 00 Lund, Sweden)

  • Magnus Arnell

    (Department of Biomedical Engineering (BME), Division of Industrial Electrical Engineering and Automation (IEA), Lund University, P.O. Box 118, SE-221 00 Lund, Sweden
    RISE Research Institutes of Sweden, Gjuterigatan 1D, SE-582 73 Linköping, Sweden)

Abstract

Anaerobic co-digestion allows for under-utilised digesters to increase biomethane production. The organic fraction of municipal solid waste (OFMSW), i.e., food waste, is an abundant substrate with high degradability and gas potential. This paper investigates the co-digestion of mixed sludge from wastewater treatment plants and OFMSW, through batch and continuous lab-scale experiments, modelling, and microbial population analysis. The results show a rapid adaptation of the process, and an increase of the biomethane production by 20% to 40%, when co-digesting mixed sludge with OFMSW at a ratio of 1:1, based on the volatile solids (VS) content. The introduction of OFMSW also has an impact on the microbial community. With 50% co-substrate and constant loading conditions (1 kg VS/m 3 /d) the methanogenic activity increases and adapts towards acetate degradation, while the community in the reference reactor, without a co-substrate, remains unaffected. An elevated load (2 kg VS/m 3 /d) increases the methanogenic activity in both reactors, but the composition of the methanogenic population remains constant for the reference reactor. The modelling shows that ammonium inhibition increases at elevated organic loads, and that intermittent feeding causes fluctuations in the digester performance, due to varying inhibition. The paper demonstrates how modelling can be used for designing feed strategies and experimental set-ups for anaerobic co-digestion.

Suggested Citation

  • Alexander Keucken & Moshe Habagil & Damien Batstone & Ulf Jeppsson & Magnus Arnell, 2018. "Anaerobic Co-Digestion of Sludge and Organic Food Waste—Performance, Inhibition, and Impact on the Microbial Community," Energies, MDPI, vol. 11(9), pages 1-13, September.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:9:p:2325-:d:167554
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    References listed on IDEAS

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    1. Gómez, X. & Cuetos, M.J. & Cara, J. & Morán, A. & García, A.I., 2006. "Anaerobic co-digestion of primary sludge and the fruit and vegetable fraction of the municipal solid wastes," Renewable Energy, Elsevier, vol. 31(12), pages 2017-2024.
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    Cited by:

    1. Elalami, D. & Carrere, H. & Monlau, F. & Abdelouahdi, K. & Oukarroum, A. & Barakat, A., 2019. "Pretreatment and co-digestion of wastewater sludge for biogas production: Recent research advances and trends," Renewable and Sustainable Energy Reviews, Elsevier, vol. 114(C), pages 1-1.
    2. Jara Laso & Isabel García-Herrero & María Margallo & Alba Bala & Pere Fullana-i-Palmer & Angel Irabien & Rubén Aldaco, 2019. "LCA-Based Comparison of Two Organic Fraction Municipal Solid Waste Collection Systems in Historical Centres in Spain," Energies, MDPI, vol. 12(7), pages 1-18, April.
    3. Xiaoshan Meng & Yuxiu Zhang & Qianwen Sui & Junya Zhang & Rui Wang & Dawei Yu & Yawei Wang & Yuansong Wei, 2018. "Biochemical Conversion and Microbial Community in Response to Ternary pH Buffer System during Anaerobic Digestion of Swine Manure," Energies, MDPI, vol. 11(11), pages 1-17, November.
    4. Sedighi, Afsane & Karrabi, Mohsen & Shahnavaz, Bahar & Mostafavinezhad, Morteza, 2022. "Bioenergy production from the organic fraction of municipal solid waste and sewage sludge using mesophilic anaerobic co-digestion: An experimental and kinetic modeling study," Renewable and Sustainable Energy Reviews, Elsevier, vol. 153(C).

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