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Structural changes of sewage sludge char during fixed-bed pyrolysis / Javier Ábrego in Industrial & engineering chemistry research, Vol. 48 N° 6 (Mars 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3211–3221 Titre : Structural changes of sewage sludge char during fixed-bed pyrolysis Type de document : texte imprimé Auteurs : Javier Ábrego, Auteur ; Jesús Arauzo, Auteur ; José Luis Sanchez, Auteur Année de publication : 2009 Article en page(s) : pp. 3211–3221 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Wastewater  treatment  plant  Sewage  sludge  Fixed-bed  reactor  Heating  rate Résumé : Undigested dried sewage sludge from a wastewater treatment plant was pyrolyzed at temperatures between 300 and 900 °C, with an additional hold time at the highest temperature. A fixed-bed reactor was used with a heating rate of 20 °C/min under an atmosphere of nitrogen. Pyrolysis product distribution, FTIR, XRD, BET, SEM, and ultimate and proximate analyses were used to gain a better understanding of the structural changes occurring during pyrolysis. At low to medium pyrolysis temperatures, major mass loss occurs, and most of the gaseous and liquid products are released with little porous development, whereas at temperatures between 700 and 900 °C, structural changes seem to be triggered by calcium carbonate decomposition. This leads to a second stage of gas evolution, as CaO promotes gasification of the char in the presence of iron sulfides. The subsequent release of CO runs parallel with an increase in the BET surface area. In addition, the aromatic character of the char increases with temperature, and nanotube-like tubular structures can be detected by SEM. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801366t [article] Structural changes of sewage sludge char during fixed-bed pyrolysis [texte imprimé] / Javier Ábrego, Auteur ; Jesús Arauzo, Auteur ; José Luis Sanchez, Auteur . - 2009 . - pp. 3211–3221. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 6 (Mars 2009) . - pp. 3211–3221 Mots-clés : Wastewater  treatment  plant  Sewage  sludge  Fixed-bed  reactor  Heating  rate Résumé : Undigested dried sewage sludge from a wastewater treatment plant was pyrolyzed at temperatures between 300 and 900 °C, with an additional hold time at the highest temperature. A fixed-bed reactor was used with a heating rate of 20 °C/min under an atmosphere of nitrogen. Pyrolysis product distribution, FTIR, XRD, BET, SEM, and ultimate and proximate analyses were used to gain a better understanding of the structural changes occurring during pyrolysis. At low to medium pyrolysis temperatures, major mass loss occurs, and most of the gaseous and liquid products are released with little porous development, whereas at temperatures between 700 and 900 °C, structural changes seem to be triggered by calcium carbonate decomposition. This leads to a second stage of gas evolution, as CaO promotes gasification of the char in the presence of iron sulfides. The subsequent release of CO runs parallel with an increase in the BET surface area. In addition, the aromatic character of the char increases with temperature, and nanotube-like tubular structures can be detected by SEM. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801366t