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Thermochemical treatment of sewage sludge by integration of drying and pyrolysis/autogasification

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  • Ledakowicz, S.
  • Stolarek, P.
  • Malinowski, A.
  • Lepez, O.

Abstract

An integrated treatment of sewage sludge by drying and pyrolysis/autogasification was proposed. First, the experiments of sewage sludge (SS) drying and pyrolysis were performed in TG/MS set-up and the kinetic experiments were evaluated. Additionally, SS was investigated by rheometry, elemental analysis and X-ray powder diffraction; the product, – pyrolytic coke was also analyzed by elemental analysis and XRD. Then the experiments were performed in a pilot scale system (at the feed rate of 40 kg/h) containing a contact dryer SHTS, Kenki Co, and Spirajoule® pyrolysis reactor. Two types of SS from a wastewater treatment plant (WWTP) near Compiegne, France with and without lime were investigated. The pyrolysis was performed at temperatures of 400 °C and 800 °C for SS with lime and in 800 °C for SS without lime, for the sludge residence time of 15 and 20 min. The pyrolytic gas possesses high calorific value (up to 19 MJ/m3) and could be totally utilized for low-pressure steam production necessary for SS drying. Based on the obtained results, scaling up of the integrated processes of drying and pyrolysis was performed in a mobile unit with a capacity of 100 kg/h, which was constructed and assembled in a shipping container and tested at a WWTP in Elblag, Poland. The energy balance for the integrated process of drying and pyrolysis/ autogasification is presented in a Sankey's graph.

Suggested Citation

  • Ledakowicz, S. & Stolarek, P. & Malinowski, A. & Lepez, O., 2019. "Thermochemical treatment of sewage sludge by integration of drying and pyrolysis/autogasification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 104(C), pages 319-327.
    • Handle: RePEc:eee:rensus:v:104:y:2019:i:c:p:319-327
    DOI: 10.1016/j.rser.2019.01.018
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    References listed on IDEAS

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    1. Syed-Hassan, Syed Shatir A. & Wang, Yi & Hu, Song & Su, Sheng & Xiang, Jun, 2017. "Thermochemical processing of sewage sludge to energy and fuel: Fundamentals, challenges and considerations," Renewable and Sustainable Energy Reviews, Elsevier, vol. 80(C), pages 888-913.
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