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Waste Management & Research, Vol. 23, No. 1, 57-61 (2005)
DOI: 10.1177/0734242X05051017

Chloride extraction for quality improvement of municipal solid waste incinerator ash for the concrete industry

Giancarlo Boghetich

Department of Civil and Environmental Engineering, Technical University of Bari, 4, Via Orabona, 70125 Bari, Italy. Tel: +39 0805 963278; fax: +39 0805 963635 boghetich{at}poliba.it

Lorenzo Liberti

Michele Notarnicola

Maria Palma

Domenico Petruzzelli

Department of Civil and Environmental Engineering, Technical University of Bari, Bari, Italy

Coal ash from power stations has long been used successfully in the cement industry as binders in several Portland formulations. This is not the case for municipal solid waste (MSW) ash as chloride concentrations, ranging from 10 to 200 g kg – 1 dry weight in the bottom and fly ash, respectively, exceed the maximum allowable concentration in most cement mixtures. To reduce chloride content in MSW bottom ash, a laboratory investigation was carried out based on the exhaustive washing in tap water. The influence of operative parameters such as temperature, granulometric properties and solid/liquid ratio of extraction was evaluated. In addition to optimization of the mentioned operative parameters for full-scale application, the paper gives preliminary indications on mechanistic aspects of the washing operation.

Key Words: Ash • chloride • municipal solid waste • incineration • concrete • wmr 724–4


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