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Anaerobic co-digestion of the process water from waste activated sludge hydrothermally treated with primary sewage sludge. A new approach for sewage sludge management

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  • Villamil, J.A.
  • Mohedano, A.F.
  • San Martín, J.
  • Rodriguez, J.J.
  • de la Rubia, M.A.

Abstract

Hydrothermal carbonization (HTC) is a suitable technology for managing wastes with a high moisture content, providing a carbon-rich and high energy density material called hydrochar and a process water (PW) with significant organic matter content. The aim of this work was to develop a new approach to sewage sludge management involving anaerobic digestion (AD) of the PW of dewatered waste activated sludge (DWAS) with primary sewage sludge (PSS). The process was optimized by performing semi-continuous experiments with different feed mixture compositions (10% PW/90% PSS and 5% PW/95% PSS, on a COD basis), organic loading rates (OLR; 1.5 and 2.5 g COD L−1 d−1), and temperature regimes (mesophilic and thermophilic). The combination of mesophilic conditions, a 10% PW/90% PSS feed mixture and OLR of 1.5 g COD L−1 d−1 provided concentrations of volatile fatty acids <400 mg COD L−1 in addition to a methane yield (172 ± 11 mL CH4 g−1 CODadded), 1.15 times the value for the control test (100% PSS). Therefore, the energy content of hydrochar from HTC of DWAS followed by AD of the process water with primary sewage sludge enhances the valorization of this renewable residue.

Suggested Citation

  • Villamil, J.A. & Mohedano, A.F. & San Martín, J. & Rodriguez, J.J. & de la Rubia, M.A., 2020. "Anaerobic co-digestion of the process water from waste activated sludge hydrothermally treated with primary sewage sludge. A new approach for sewage sludge management," Renewable Energy, Elsevier, vol. 146(C), pages 435-443.
    • Handle: RePEc:eee:renene:v:146:y:2020:i:c:p:435-443
    DOI: 10.1016/j.renene.2019.06.138
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    References listed on IDEAS

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    2. Ahn, Hyungjun & Kim, Donghee & Lee, Youngjae, 2020. "Combustion characteristics of sewage sludge solid fuels produced by drying and hydrothermal carbonization in a fluidized bed," Renewable Energy, Elsevier, vol. 147(P1), pages 957-968.
    3. Aragon-Briceño, Christian & Pożarlik, Artur & Bramer, Eddy & Brem, Gerrit & Wang, Shule & Wen, Yuming & Yang, Weihong & Pawlak-Kruczek, Halina & Niedźwiecki, Łukasz & Urbanowska, Agnieszka & Mościcki,, 2022. "Integration of hydrothermal carbonization treatment for water and energy recovery from organic fraction of municipal solid waste digestate," Renewable Energy, Elsevier, vol. 184(C), pages 577-591.
    4. Ruffino, Barbara & Cerutti, Alberto & Campo, Giuseppe & Scibilia, Gerardo & Lorenzi, Eugenio & Zanetti, Mariachiara, 2020. "Thermophilic vs. mesophilic anaerobic digestion of waste activated sludge: Modelling and energy balance for its applicability at a full scale WWTP," Renewable Energy, Elsevier, vol. 156(C), pages 235-248.
    5. Pagés-Díaz, Jhosané & Cerda Alvarado, Andrés Osvaldo & Montalvo, Silvio & Diaz-Robles, Luis & Curio, César Huiliñir, 2020. "Anaerobic bio-methane potential of the liquors from hydrothermal carbonization of different lignocellulose biomasses," Renewable Energy, Elsevier, vol. 157(C), pages 182-189.
    6. Aragón-Briceño, C.I. & Ross, A.B. & Camargo-Valero, M.A., 2021. "Mass and energy integration study of hydrothermal carbonization with anaerobic digestion of sewage sludge," Renewable Energy, Elsevier, vol. 167(C), pages 473-483.
    7. Kossińska, Nina & Krzyżyńska, Renata & Ghazal, Heba & Jouhara, Hussam, 2023. "Hydrothermal carbonisation of sewage sludge and resulting biofuels as a sustainable energy source," Energy, Elsevier, vol. 275(C).
    8. Palma-Heredia, D. & Verdaguer, M. & Molinos-Senante, M. & Poch, M. & Cugueró-Escofet, M.À., 2021. "Optimised blending for anaerobic co-digestion using ant colony approach: Besòs river basin case study," Renewable Energy, Elsevier, vol. 168(C), pages 141-150.

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