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Optimization of Solid State Anaerobic Digestion by inoculum recirculation: The case of an existing Mechanical Biological Treatment plant

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  • Di Maria, Francesco
  • Sordi, Alessio
  • Micale, Caterina

Abstract

The energetic exploitation of the organic fraction of municipal solid waste treated in an existing Mechanical Biological Treatment plant was found to be successful by the Solid State Anaerobic Digestion. The amount of inoculum used per tonne of waste for starting the anaerobic process was shown to have a relevant effect on both biogas and biomethane production. For a waste-to-inoculum ratio ranging from 1:1 to 1:3 (w/w), the energy production increased from about 100kWh/tonne to about 380kWh/tonne of waste organic fraction. Consequently, the investment costs also rise, going from about 180€ to more than 370€/tonne of treated municipal solid waste organic fraction. The economic optimization analysis showed that the waste-to-inoculum ratio that minimized the treatment cost, ranged from 1:1.5 to 1:2.5, being strongly influenced by the plant size (i.e. electrical efficiency) and by the Green Certificate value. Considering the cost of producing electrical energy, the optimum ratio was 1:2, leading to a cost of 0.26€/kWh, during the investment period, and of 0.14€/kWh after the investment period.

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  • Di Maria, Francesco & Sordi, Alessio & Micale, Caterina, 2012. "Optimization of Solid State Anaerobic Digestion by inoculum recirculation: The case of an existing Mechanical Biological Treatment plant," Applied Energy, Elsevier, vol. 97(C), pages 462-469.
    • Handle: RePEc:eee:appene:v:97:y:2012:i:c:p:462-469
    DOI: 10.1016/j.apenergy.2011.12.093
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    1. Lin, Long & Xu, Fuqing & Ge, Xumeng & Li, Yebo, 2018. "Improving the sustainability of organic waste management practices in the food-energy-water nexus: A comparative review of anaerobic digestion and composting," Renewable and Sustainable Energy Reviews, Elsevier, vol. 89(C), pages 151-167.
    2. Li, Chao & Tao, Yu & Fang, Jun & Li, Qiang & Lu, Wenjing, 2020. "Impact of continuous leachate recirculation during solid state anaerobic digestion of Miscanthus," Renewable Energy, Elsevier, vol. 154(C), pages 38-45.
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    4. Di Maria, Francesco & Micale, Caterina, 2017. "Energetic potential of the co-digestion of sludge with bio-waste in existing wastewater treatment plant digesters: A case study of an Italian province," Energy, Elsevier, vol. 136(C), pages 110-116.
    5. Wu, Duo & Lü, Fan & Shao, Liming & He, Pinjing, 2017. "Effect of cycle digestion time and solid-liquid separation on digestate recirculated one-stage dry anaerobic digestion: Use of intact polar lipid analysis for microbes monitoring to enhance process ev," Renewable Energy, Elsevier, vol. 103(C), pages 38-48.
    6. Di Maria, Francesco & Micale, Caterina & Sordi, Alessio, 2014. "Electrical energy production from the integrated aerobic-anaerobic treatment of organic waste by ORC," Renewable Energy, Elsevier, vol. 66(C), pages 461-467.
    7. Tonini, Davide & Dorini, Gianluca & Astrup, Thomas Fruergaard, 2014. "Bioenergy, material, and nutrients recovery from household waste: Advanced material, substance, energy, and cost flow analysis of a waste refinery process," Applied Energy, Elsevier, vol. 121(C), pages 64-78.
    8. Chen, Shuxian & Dai, Xiaohu & Yang, Donghai & Dai, Lingling & Hua, Yu, 2023. "Enhancing PHA production through metal-organic frameworks: Mechanisms involving superproton transport and bacterial metabolic pathways," Applied Energy, Elsevier, vol. 348(C).
    9. Estefani Rondón Toro & Ana López Martínez & Amaya Lobo García de Cortázar, 2023. "Sequential Methodology for the Selection of Municipal Waste Treatment Alternatives Applied to a Case Study in Chile," Sustainability, MDPI, vol. 15(9), pages 1-18, May.
    10. Di Maria, Francesco & Micale, Caterina, 2015. "The contribution to energy production of the aerobic bioconversion of organic waste by an organic Rankine cycle in an integrated anaerobic–aerobic facility," Renewable Energy, Elsevier, vol. 81(C), pages 770-778.
    11. Ripa, M. & Fiorentino, G. & Giani, H. & Clausen, A. & Ulgiati, S., 2017. "Refuse recovered biomass fuel from municipal solid waste. A life cycle assessment," Applied Energy, Elsevier, vol. 186(P2), pages 211-225.
    12. Di Maria, Francesco & Sordi, Alessio & Cirulli, Giuseppe & Micale, Caterina, 2015. "Amount of energy recoverable from an existing sludge digester with the co-digestion with fruit and vegetable waste at reduced retention time," Applied Energy, Elsevier, vol. 150(C), pages 9-14.
    13. Zhang, Fang & Zhang, Yan & Chen, Yun & Dai, Kun & van Loosdrecht, Mark C.M. & Zeng, Raymond J., 2015. "Simultaneous production of acetate and methane from glycerol by selective enrichment of hydrogenotrophic methanogens in extreme-thermophilic (70°C) mixed culture fermentation," Applied Energy, Elsevier, vol. 148(C), pages 326-333.
    14. Ortner, Markus & Rachbauer, Lydia & Somitsch, Walter & Fuchs, Werner, 2014. "Can bioavailability of trace nutrients be measured in anaerobic digestion?," Applied Energy, Elsevier, vol. 126(C), pages 190-198.
    15. Romero-Güiza, M.S. & Peces, M. & Astals, S. & Benavent, J. & Valls, J. & Mata-Alvarez, J., 2014. "Implementation of a prototypal optical sorter as core of the new pre-treatment configuration of a mechanical–biological treatment plant treating OFMSW through anaerobic digestion," Applied Energy, Elsevier, vol. 135(C), pages 63-70.

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