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Combined thermal hydrolysis pretreatment and anaerobic co-digestion of waste activated sludge and food waste

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  • Ismail, Amr
  • Kakar, Farokh laqa
  • Elbeshbishy, Elsayed
  • Nakhla, George

Abstract

In this study, the impact of thermal hydrolysis pretreatment (THP) on the mono- and co-digestion of thickened waste activated sludge (TWAS) and food waste (FW) was carried out at temperatures of 150, 170, 190, and 210 °C and volumetric ratios of 90:10, 70:30, and 50:50 in batch anaerobic tests. THP enhanced solubilization, reduced volatile suspended solids (VSS) and the particle size of TWAS as the temperature increased showing optimal improvements at 170 °C. THP showed no significant impact on FW with only marginal improvements at 150 °C. Increasing the temperature beyond 170 °C for TWAS and 150 °C for FW deteriorated anaerobic biodegradability forming refractory compounds. Co-digestion improved methane yields and kinetics as the contribution of FW increased. Co-digestion of thermally pretreated TWAS with FW improved the methane yields by 27% and kinetics by 29% at 170 °C with no synergism. Co-digestion of thermally pretreated FW with TWAS improved methane yields by 15% and kinetics by 25% at 150 °C, with improvements up to 21% in synergy. THP of the mixed feedstocks improved methane yields by 53% and kinetics by 92% at 170 °C, with improvements becoming less pronounced with the increase in the volume of FW and temperature.

Suggested Citation

  • Ismail, Amr & Kakar, Farokh laqa & Elbeshbishy, Elsayed & Nakhla, George, 2022. "Combined thermal hydrolysis pretreatment and anaerobic co-digestion of waste activated sludge and food waste," Renewable Energy, Elsevier, vol. 195(C), pages 528-539.
    • Handle: RePEc:eee:renene:v:195:y:2022:i:c:p:528-539
    DOI: 10.1016/j.renene.2022.06.042
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    References listed on IDEAS

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    1. Thyberg, Krista L. & Tonjes, David J., 2016. "Drivers of food waste and their implications for sustainable policy development," Resources, Conservation & Recycling, Elsevier, vol. 106(C), pages 110-123.
    2. Anahita Rabii & Saad Aldin & Yaser Dahman & Elsayed Elbeshbishy, 2019. "A Review on Anaerobic Co-Digestion with a Focus on the Microbial Populations and the Effect of Multi-Stage Digester Configuration," Energies, MDPI, vol. 12(6), pages 1-25, March.
    3. Secondi, Luca & Principato, Ludovica & Laureti, Tiziana, 2015. "Household food waste behaviour in EU-27 countries: A multilevel analysis," Food Policy, Elsevier, vol. 56(C), pages 25-40.
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    1. Walczak, Justyna & Karolinczak, Beata & Zubrowska-Sudol, Monika, 2023. "Effect of co-digestion and hydrodynamic disintegration on the methane potential of sewage sludge and organic fraction of municipal solid waste with consideration of the carbon footprint," Energy, Elsevier, vol. 282(C).

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