Characterization of spontaneous combustuion tendency of dried sewage sludge

Medic Pejic, Ljiljana and Fernández Áñez, María de las Nieves and Montenegro Mateos, Lucía and García Torrent, Javier and Ramírez Gómez, Álvaro (2014). Characterization of spontaneous combustuion tendency of dried sewage sludge. In: "Tenth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (X ISHPMIE)", 10/06/2014 - 14/06/2014, Bergen, Norway. pp. 1453-1462.

Description

Title: Characterization of spontaneous combustuion tendency of dried sewage sludge
Author/s:
  • Medic Pejic, Ljiljana
  • Fernández Áñez, María de las Nieves
  • Montenegro Mateos, Lucía
  • García Torrent, Javier
  • Ramírez Gómez, Álvaro
Item Type: Presentation at Congress or Conference (Article)
Event Title: Tenth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (X ISHPMIE)
Event Dates: 10/06/2014 - 14/06/2014
Event Location: Bergen, Norway
Title of Book: Proceedings of Tenth International Symposium on Hazards, Prevention, and Mitigation of Industrial Explosions (X ISHPMIE)
Date: 2014
Subjects:
Faculty: E.T.S.I. de Minas y Energía (UPM)
Department: Ingeniería Química y Combustibles [hasta 2014]
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

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.

More information

Item ID: 30667
DC Identifier: http://oa.upm.es/30667/
OAI Identifier: oai:oa.upm.es:30667
Deposited by: Memoria Investigacion
Deposited on: 01 Sep 2014 09:50
Last Modified: 22 Apr 2016 00:56
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