Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7482044 | Journal of Environmental Management | 2015 | 13 Pages |
Abstract
Phosphate coating hazardous wastes originated from the automotive industry were efficiently encapsulated by an acid-base reaction between phosphates present in the sludge and calcium aluminate cement, yielding very inert and stable monolithic blocks of amorphous calcium phosphate (ACP). Two different compositions of industrial sludge were characterized and loaded in ratios ranging from 10 to 50Â wt.%. Setting times and compressive strengths were recorded to establish the feasibility of this method to achieve a good handling and a safe landfilling of these samples. Short solidification periods were found and leaching tests showed an excellent retention for toxic metals (Zn, Ni, Cu, Cr and Mn) and for organic matter. Retentions over 99.9% for Zn and Mn were observed even for loadings as high as 50Â wt.% of the wastes. The formation of ACP phase of low porosity and high stability accounted for the effective immobilization of the hazardous components of the wastes.
Keywords
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Renewable Energy, Sustainability and the Environment
Authors
I. Navarro-Blasco, A. Duran, M. Pérez-Nicolás, J.M. Fernández, R. Sirera, J.I. Alvarez,