Groundwater source characterization of landfills Groundwater source characterization of landfills

Project Details


Investigations of the pollution of groundwater from old landfills have in most cases focused on delineating the pollution plume and only in very few cases on the landfill as a source togroundwater pollution. Landfills often cover large
areas. Spatial variations in leachate composition may have great impact on the location of the main pollution plume in the downstream aquifer. Choice of proper remedial actions
depend also on the location of the mass of pollutant. If the main part of the mass still is located in the source, one type of remedial action should be considered. On the other hand, if the main part of the total mass already has leached to the groundwater, pump-and-treat could be the best alternative.

Therefore information on time frame aspects of the leaching process is of great importance.

Grindsted Landfill, Denmark is investigated by sampling leachate beneath the landfill and groundwater at the borders of the landfill, and by sampling the highly polluted industrial waste to be used in batch leaching tests. A pronounced variability in leachate quality and leakage patterns from the landfill is observed. Also variations in
local groundwater flow directions isfound. Due to a very high fraction of organic carbon in the industrial waste the BTEX are strongly sorbed to the waste, and high concentrations are expected to leach out for very long periods.

The observations are very important for delineation of the groundwater pollution and for proper choice of remedial action activities both related to the plume and to the landfill.

In 1998 two papers have been published in Waste Management and Research
Effective start/end date01/06/199331/12/1999