Lookup NU author(s): Maggie White,
Professor David Manning
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Scaling of leachate drainage systems and equipment at landfill sites is of common concern for many site operators. The environmental geochemical processes responsible for, and the timing of scale precipitation from leachates are poorly constrained. In order to address these issues, routine monitoring data for leachates from 5 UK landfill sites were interpreted using geochemical modelling. Results suggest that all investigated leachates were supersaturated with respect to calcite and undersaturated with respect to gypsum over the 30 month study period. Mineralogical analysis of associated scale solids revealed an abundance of calcite in most samples, with variable concentrations of Mg and Mn evident as minor elements (within calcite) in one solid. Gypsum and sulphur were detected in another of the solids, contrary to modelling predictions. The data indicate that sites used in this study may be susceptible to calcite scaling (as opposed to gypsum) from leachates of all ages, however the geochemical model and/or the input parameters may require refinement to allow justifiable data interpretation for landfill leachates in the future.
Author(s): White ML, Manning DAC, Macquaker JHS
Editor(s): Lencioni, E; Dhanda, R
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: Proceedings of the Waste 2002 Conference, Integrated Waste Management and Pollution Control: Research, Policy and Practice
Year of Conference: 2002
Pages: 650, 338-348
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