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Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization

Author

Listed:
  • Sang Yeop Lee

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea)

  • Se Won Park

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea
    Environment and Sustainable Resources Center, Korea Research Institute of Chemical Technology, Daejeon 34114, Korea)

  • Md Tanvir Alam

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea
    Department of Chemical Engineering, Monash University, Clayton, Victoria 3800, Australia)

  • Yean Ouk Jeong

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea)

  • Yong-Chil Seo

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea)

  • Hang Seok Choi

    (Department of Environmental Engineering, Yonsei University, Wonju, Gangwon-do 26493, Korea)

Abstract

Proper treatment and careful management of sewage sludge are essential because its disposal can lead to adverse environmental impacts such as public health hazards, as well as air, soil, and water pollution. Several efforts are being made currently not only to safely dispose of sewage sludge but also to utilize it as an energy source. Therefore, in this study, initiatives were taken to valorize sewage sludge cake by reducing the moisture content and increasing the calorific value by applying a hydrothermal treatment technique for efficient energy recovery. The sludge cake treated at 200 °C for 1 h was found to be the optimum condition for hydrothermal carbonization, as, in this condition, the caloric value of the treated sludge increased by 10% and the moisture content removed was 20 wt.%. To recover energy from the hydrothermally treated sludge, a gasification technology was applied at 900 °C. The results showed that the product gas from hydrothermally treated sludge cake had a higher lower heating value (0.98 MJ/Nm 3 ) and higher cold gas efficiency (5.8%). Furthermore, compared with raw sludge cake, less tar was generated during the gasification of hydrothermally treated sludge cake. The removal efficiency was 28.2%. Overall results depict that hydrothermally treated sewage sludge cake could be a good source of energy recovery via the gasification process.

Suggested Citation

  • Sang Yeop Lee & Se Won Park & Md Tanvir Alam & Yean Ouk Jeong & Yong-Chil Seo & Hang Seok Choi, 2020. "Studies on the Gasification Performance of Sludge Cake Pre-Treated by Hydrothermal Carbonization," Energies, MDPI, vol. 13(6), pages 1-15, March.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:6:p:1442-:d:334619
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    References listed on IDEAS

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    1. Gabriele Calì & Paolo Deiana & Claudia Bassano & Simone Meloni & Enrico Maggio & Michele Mascia & Alberto Pettinau, 2020. "Syngas Production, Clean-Up and Wastewater Management in a Demo-Scale Fixed-Bed Updraft Biomass Gasification Unit," Energies, MDPI, vol. 13(10), pages 1-15, May.
    2. Alessandro Antonio Papa & Andrea Di Carlo & Enrico Bocci & Luca Taglieri & Luca Del Zotto & Alberto Gallifuoco, 2021. "Energy Analysis of an Integrated Plant: Fluidized Bed Steam Gasification of Hydrothermally Treated Biomass Coupled to Solid Oxide Fuel Cells," Energies, MDPI, vol. 14(21), pages 1-13, November.

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