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Energetic assessment of air-steam gasification of sewage sludge and of the integration of sewage sludge pyrolysis and air-steam gasification of char

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  • Gil-Lalaguna, N.
  • Sánchez, J.L.
  • Murillo, M.B.
  • Atienza-Martínez, M.
  • Gea, G.

Abstract

Thermo-chemical treatment of sewage sludge is an interesting option for recovering energy and/or valuable products from this waste. This work presents an energetic assessment of pyrolysis and gasification of sewage sludge, also considering the prior sewage sludge thermal drying and the gasification of the char derived from the pyrolysis stage. Experimental data obtained from pyrolysis of sewage sludge, gasification of sewage sludge and gasification of char (all of these performed in a lab-scale fluidized reactor) were used for the energetic calculations. The results show that the energy contained in the product gases from pyrolysis and char gasification is not enough to cover the high energy consumption for thermal drying of sewage sludge. Additional energy could be obtained from the calorific value of the pyrolysis liquid, but some of its properties must be improved facing towards its use as fuel. On the other hand, the energy contained in the product gas of sewage sludge gasification is enough to cover the energy demand for both the sewage sludge thermal drying and the gasification process itself. Furthermore, a theoretical study included in this work shows that the gasification efficiency is improved when the chemical equilibrium is reached in the process.

Suggested Citation

  • Gil-Lalaguna, N. & Sánchez, J.L. & Murillo, M.B. & Atienza-Martínez, M. & Gea, G., 2014. "Energetic assessment of air-steam gasification of sewage sludge and of the integration of sewage sludge pyrolysis and air-steam gasification of char," Energy, Elsevier, vol. 76(C), pages 652-662.
    • Handle: RePEc:eee:energy:v:76:y:2014:i:c:p:652-662
    DOI: 10.1016/j.energy.2014.08.061
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