METAL SPECIATION IN NINE FRENCH LANDFILL LEACHATES
Several heavy metals or metalloids, that may be present in landfill leachates, are considered as priority pollutants for groundwater resources (for example lead, cadmium, nickel; OJEC, 2001). While the fate and transport of such elements are largely influenced by chemical speciation reactions, landfill risk assessments generally adopt a simplified “Kd” approach which assumes steady-state liquid-solid partition between the liquid and solid phases. Such simplification may result in a severe overestimation of long-term environmental or health impact. Speciation reactions such as precipitation or co-precipitation participate in the natural attenuation of landfill leachate and help explain why heavy metals are rarely detected in groundwater at significant distances from landfills (Christensen et al., 2001).
Risk assessments of the potential impact of landfills on groundwater or human health often rely on the liquid-solid partition coefficient (Kd) for predicting the mobility and fate of heavy metals (Pb, Cd, Ni, ...). Yet it is well known that the Kd concept is poorly suited to describing metal behaviour in complex geochemical environments, due in particular to the influence of chemical speciation reactions and the effect of mineral phases on heavy metal solubilities. In order to illustrate the importance of accounting for chemical speciation when assessing risks related to landfill leachate and also to obtain leachate metal speciation data that is representative of a range of French landfills, leachates were collected from nine French landfills and sampled using a sequential filtration protocol. This paper presents the chemical analyses of sampled fluids, results of speciation calculations and suggests some implications for metal mobility and natural attenuation.
| Copyright: | © IWWG International Waste Working Group | |
| Source: | Workshop G (Oktober 2007) | |
| Pages: | 10 | |
| Price inc. VAT: | € 0,00 | |
| Autor: | Dominique Guyonnet  Catherine Crouzet Christophe Tournassat E. Gaucher G. Braibant | |
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