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Sludge stabilization and energy recovery by hydrothermal carbonization process

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  • Koottatep, Thammarat
  • Fakkaew, Krailak
  • Tajai, Nutnicha
  • Pradeep, Sangeetha V.
  • Polprasert, Chongrak

Abstract

Hydrothermal carbonization (HTC) is a thermal conversion process that converts high-moisture biomass into hydrochar. HTC was applied to stabilize and process sludge collected from septic tanks into hydrochar for practical energy recovery. Experiments were conducted with a 1-L high-pressure reactor operating at different temperatures and reaction times in which the sludge was mixed with catalysts and biomass at different ratios. The effects of catalysts (i.e., acetic acid, lithium chloride, borax, and zeolite) and biomass (i.e., cassava pulp, dried leaves, pig manure, and rice husks) mixing with sludge for hydrochar production were investigated. The experimental data showed acetic acid and cassava pulp to be the most effective catalyst and biomass, respectively, increasing energy contents to the maximum value of 28.5 MJ/kg. The optimum HTC conditions were as follows: sludge/acetic acid/cassava pulp mixing ratio of 1/0.4/1 (by weight), at a temperature of 220 °C, and reaction time of 0.5 h. The relatively high energy contents of the produced hydrochar suggest its applicability as a solid fuel.

Suggested Citation

  • Koottatep, Thammarat & Fakkaew, Krailak & Tajai, Nutnicha & Pradeep, Sangeetha V. & Polprasert, Chongrak, 2016. "Sludge stabilization and energy recovery by hydrothermal carbonization process," Renewable Energy, Elsevier, vol. 99(C), pages 978-985.
    • Handle: RePEc:eee:renene:v:99:y:2016:i:c:p:978-985
    DOI: 10.1016/j.renene.2016.07.068
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    References listed on IDEAS

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    1. Danso-Boateng, E. & Holdich, R.G. & Shama, G. & Wheatley, A.D. & Sohail, M. & Martin, S.J., 2013. "Kinetics of faecal biomass hydrothermal carbonisation for hydrochar production," Applied Energy, Elsevier, vol. 111(C), pages 351-357.
    2. He, Chao & Giannis, Apostolos & Wang, Jing-Yuan, 2013. "Conversion of sewage sludge to clean solid fuel using hydrothermal carbonization: Hydrochar fuel characteristics and combustion behavior," Applied Energy, Elsevier, vol. 111(C), pages 257-266.
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