Characterisation and Leachability of Sewage Sludge Ash
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Published:2003
C A Johnson, 2003. "Characterisation and Leachability of Sewage Sludge Ash", Sustainable Waste Management: Proceedings of the International Symposium held at the University of Dundee, Scotland, UK on 9–11 September 2003, Ravindra K. Dhir, Moray D. Newlands, Tom D. Dyer
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This study focuses on the characterisation of sewage sludge ashes from 2 sites in Switzerland. The elemental composition and the acid neutralising capacity (ANC) were determined and mineral components identified. The leaching behaviour of major and minor inorganic components was assessed as a function of liquid:solid (L:S) ratio and leachate pH. The major elements are Ca, Al, Si, and P, all having concentrations around and above 5% w/w. In the SSA samples, the Fe concentrations are high (around 15%) and this is associated with the treatment of sewage sludge. Organic carbon concentrations are around 0.5% as HCHO. Carbonate concentrations lie between 0.1 and 0.7% for all samples. The heavy metal and metalloid components in the highest concentrations are Cu, Zn, Mn, Pb, Cr and Ni, which are all in the g kg−1 range. In the mg kg−1 range are V, Co, Sb, As, Mo, Cd, W and Se. The solubility of the heavy metal and metalloid ions is low due to the precipitation of solid phases and adsorption to Fe oxides.
Introduction
Sampling and Analytical Procedures
Results and Discussion
Conclusions
Acknowledgements
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