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Memorias de investigación
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Characterization of spontaneous combustuion tendency of dried sewage sludge
Research Areas
  • Engineering
The general purpose of this study was the determination of the safety conditions to avoid the presence of explosive atmospheres in the wastewater industry. Eight Spanish plants located in Madrid, Barcelona and Málaga were considered and several sludge samples were taken in different seasons. The base for the assessment of the spontaneous ignition behaviour of dust accumulations is the experimental determination of the self-ignition temperature under isothermal conditions. Self-ignition temperatures at four volumes were obtained for one sample of sewage sludge, allowing their extrapolation to large storage facilities. A simple test method, based also on an isothermal study of samples, is the UN classification of substances liable to spontaneous combustion. Two different samples were so tested, obtaining unlike results if transported in packages of different volumes. By means of thermogravimetric techniques it is possible to analyse the thermal susceptibility of dried sewage sludge. Apparent activation energy can be obtained from the rate of weight loss. It is also applied to the study of self-ignition susceptibility by modifying test conditions when oxygen stream is introduced. As a consequence of this oxidant contribution, sample behaviour can be very different during testing and a step drop or sudden loss of weight is observed at a characteristic temperature for every substance, associated to a rapid combustion. Plotting both the activation energy and the characteristic temperature, a map of self-ignition risk was obtained for 10 samples, showing different risk levels for samples taken in different locations and at different seasons. A prediction of the self-ignition risk level can be also determined.
Tenth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (X ISHPMIE)
Bergen, Norway
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Proceedings of Tenth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (X ISHPMIE)
  • Autor: Ljiljana Medic Pejic (UPM)
  • Autor: Maria de las Nieves Fernandez Añez (UPM)
  • Autor: Lucia Montenegro Mateos (UPM)
  • Autor: Javier Garcia Torrent (UPM)
  • Autor: Alvaro Ramirez Gomez (UPM)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Seguridad Industrial: atmósferas explosivas
  • Grupo de Investigación: Edificación, Infraestructura y Proyectos en Ingeniería Rural y Medioambiental (EIPIRMA)
  • Departamento: Energía y Combustibles
S2i 2020 Observatorio de investigación @ UPM con la colaboración del Consejo Social UPM
Cofinanciación del MINECO en el marco del Programa INNCIDE 2011 (OTR-2011-0236)
Cofinanciación del MINECO en el marco del Programa INNPACTO (IPT-020000-2010-22)