In the strongly anaerobic part of the leachate plume at the Grindsted Landfill very high concentrations of dissolved iron and manganese have been observed consistently; for example iron was found in concentrations exceeding 200 mg/l. Samples carefully obtained from the plume have been characterized in terms of colloidal content (cross flow filtration) and free ferro-ion activity (ion exchange resin technique). The results surprisingly suggest that more than 70% of the measured iron concentrations are due to free ferro-ions. This suggests strongly supersaturated conditions in the plume and currently the thermodynamic data for siderite (FeCO3)is being revisited and supplementary measurements made.
|Effective start/end date||01/02/1997 → 31/12/1998|
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