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Hydrothermal carbonization of stabilized sludge and meat and bone meal

Author

Listed:
  • J. Malaťák

    (Department of Technological Equipment of Buildings, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic)

  • T. Dlabaja

    (Department of Technological Equipment of Buildings, Faculty of Engineering, Czech University of Life Sciences Prague, Prague, Czech Republic)

Abstract

Hydrothermal carbonization is one of suitable methods for energy recovery of sewage sludge and meat and bone meal. The task of the article is to determine appropriate hydrothermal carbonization process conditions and their impact on the quality of the final product - so called biochar or hydrochar. Parameters of the two main phases - initiation and polymerization - were monitored. The basic fuel properties of the final solid products of hydrothermal carbonization were determined. To produce biochar by hydrothermal carbonization, multifunctional pressure vessel with accessories was used - a batch reactor BR-300. Process parameters of hydrothermal carbonization confirm the effect of increasing temperature to increase the lower heating value (LHV). Neither calorific values of meat and bone meal (17.22 MJ/kg), nor calorific values of digested stabilized sludge (12.14 MJ/kg) showed a significant increase after undergoing processing. The effect of reaction temperature on the LHV of the final product is significantly higher than that of residence time. The results show that the main factor affecting LHV of the fuel sample is the final amount of ash. Unlike the meat and bone the hydrothermal carbonization of the stabilized wastewater sludge is one of the effective processing methods for subsequent energy use.

Suggested Citation

  • J. Malaťák & T. Dlabaja, 2015. "Hydrothermal carbonization of stabilized sludge and meat and bone meal," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 61(1), pages 21-28.
    • Handle: RePEc:caa:jnlrae:v:61:y:2015:i:1:id:59-2013-rae
    DOI: 10.17221/59/2013-RAE
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    References listed on IDEAS

    as
    1. J. Malaťák & L. Passian, 2011. "Heat-emission analysis of small combustion equipments for biomass," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 57(2), pages 37-50.
    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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    Cited by:

    1. J. Velebil & J. Malaťák & J. Bradna, 2016. "Mass yield of biochar from hydrothermal carbonization of sucrose," Research in Agricultural Engineering, Czech Academy of Agricultural Sciences, vol. 62(4), pages 179-184.

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