Evaluation of a lime-mediated sewage sludge stabilisation process. Product characterisation and technological validation for its use in the cement industry

Evaluation of a lime-mediated sewage sludge stabilisation process. Product characterisation and technological validation for its use in the cement industry

Published by Elsevier Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Waste management (New York, N.Y.). - 1999. - 32(2012), 3 vom: 15. März, Seite 550-60
1. Verfasser: Rodríguez, N Husillos (VerfasserIn)
Weitere Verfasser: Granados, R J, Blanco-Varela, M T, Cortina, J L, Martínez-Ramírez, S, Marsal, M, Guillem, M, Puig, J, Fos, C, Larrotcha, E, Flores, J
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2012
Zugriff auf das übergeordnete Werk:Waste management (New York, N.Y.)
Schlagworte:Journal Article Research Support, Non-U.S. Gov't Review Validation Study Calcium Compounds Oxides Sewage lime C7X2M0VVNH Calcium Hydroxide PF5DZW74VN
Beschreibung
Zusammenfassung:Published by Elsevier Ltd.
This paper describes an industrial process for stabilising sewage sludge (SS) with lime and evaluates the viability of the stabilised product, denominated Neutral, as a raw material for the cement industry. Lime not only stabilised the sludge, raised the temperature of the mix to 80-100°C, furthering water evaporation, portlandite formation and the partial oxidation of the organic matter present in the sludge. Process mass and energy balances were determined. Neutral, a white powder consisting of portlandite (49.8%), calcite (16.6%), inorganic oxides (13.4%) and organic matter and moisture (20.2%), proved to be technologically apt for inclusion as a component in cement raw mixes. In this study, it was used instead of limestone in raw mixes clinkerised at 1400, 1450 and 1500°C. These raw meals exhibited greater reactivity at high temperatures than the limestone product and their calcination at 1500°C yielded clinker containing over 75% calcium silicates, the key phases in Portland clinker. Finally, the two types of raw meal (Neutral and limestone) were observed to exhibit similar mineralogy and crystal size and distribution
Beschreibung:Date Completed 05.06.2012
Date Revised 10.12.2019
published: Print-Electronic
Citation Status MEDLINE
ISSN:1879-2456
DOI:10.1016/j.wasman.2011.10.021