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Pyrolysis of blends of different types of sewage sludge with one bituminous coal

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  • Folgueras, M. Belén
  • Díaz, R. María
  • Xiberta, Jorge

Abstract

Pyrolysis of sewage sludge samples from three Asturian urban wastewater treatment plants was carried out. One high volatile bituminous coal and its blends with 10 and 50wt% of sludge were studied by thermogravimetry. The same operational conditions (a constant heating rate of 10°C/min in the temperature range 25–800°C and a N2 flow of 200cm3/min) were maintained throughout. The results indicate that sludge is formed by two organic fractions with different reactivity, whose devolatilisation processes partially overlap. Both fractions are more reactive than coal, since they decompose and devolatilise at temperatures lower than coal. Under oxidizing conditions, the action of oxygen during pyrolysis depends on the conditioning of sludge. If sludge is treated with FeCl3, oxidative pyrolysis takes place. The behaviour of sludge–coal blends is intermediate between those of the coal and the corresponding sludge, without interactions between both blend components. In addition, a kinetic analysis was performed to fit thermogravimetric data, the global processes being considered as a series of consecutive first order reactions. A reasonable fit to the experimental data was obtained for all materials and their blends.

Suggested Citation

  • Folgueras, M. Belén & Díaz, R. María & Xiberta, Jorge, 2005. "Pyrolysis of blends of different types of sewage sludge with one bituminous coal," Energy, Elsevier, vol. 30(7), pages 1079-1091.
    • Handle: RePEc:eee:energy:v:30:y:2005:i:7:p:1079-1091
    DOI: 10.1016/j.energy.2004.08.001
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    References listed on IDEAS

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    1. Lee, Jong Min & Kim, Yong Jeon & Lee, Woon Jae & Kim, Sang Done, 1998. "Coal-gasification kinetics derived from pyrolysis in a fluidized-bed reactor," Energy, Elsevier, vol. 23(6), pages 475-488.
    2. Nadziakiewicz, Jan & Koziol, Michal, 2003. "Co-combustion of sludge with coal," Applied Energy, Elsevier, vol. 75(3-4), pages 239-248, July.
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    1. Folgueras, M.B. & Díaz, R.M., 2010. "Influence of FeCl3 and lime added to sludge on sludge–coal pyrolysis," Energy, Elsevier, vol. 35(12), pages 5250-5259.
    2. Pablo J. Arauzo & María Atienza-Martínez & Javier Ábrego & Maciej P. Olszewski & Zebin Cao & Andrea Kruse, 2020. "Combustion Characteristics of Hydrochar and Pyrochar Derived from Digested Sewage Sludge," Energies, MDPI, vol. 13(16), pages 1-15, August.
    3. Huang, Qian & Xu, Jiuping, 2020. "Bi-level multi-objective programming approach for carbon emission quota allocation towards co-combustion of coal and sewage sludge," Energy, Elsevier, vol. 211(C).
    4. Folgueras, M.B. & Alonso, M. & Díaz, R.M., 2013. "Influence of sewage sludge treatment on pyrolysis and combustion of dry sludge," Energy, Elsevier, vol. 55(C), pages 426-435.
    5. Tan, Peng & Ma, Lun & Xia, Ji & Fang, Qingyan & Zhang, Cheng & Chen, Gang, 2017. "Co-firing sludge in a pulverized coal-fired utility boiler: Combustion characteristics and economic impacts," Energy, Elsevier, vol. 119(C), pages 392-399.

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