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Enhanced reductive dechlorination has successfully been applied in high permeability media contaminated with chlorinated ethenes, but has not yet proved its effectiveness for use in low permeability media. In Denmark there are only few examples of such “in-situ” bioremediation, focusing on the source zone located in clay till and so there is a need for a better understanding of the different processes implied in this remediation technology.

The first and second phases of this project consisted in gathering the different experiences for reductive dechlorination as a remediation technology in clay till in Denmark and developing a modeling tool for assessing efficiency and time horizons for enhanced reductive dechlorination in clayey till. This report is the third phase of the project, where the developed model is applied to three Danish sites with chlorinated solvents in clayey till, where enhanced reductive dechlorination has been either applied or considered as a remediation technology.