Feasibility and Performance of Full-Scale In-Situ Remediation of TCE by ERD in Clay Tills

Publication: Research - peer-reviewPaper – Annual report year: 2012

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The feasibility and performance of full-scale applications of ERD in clay tills were investigated in a research project including 2 sites in Denmark, which have been undergoing remediation since 2006. At both sites organic substrates and bioaugmentation cultures have been injected in TCE-contaminated clay till. An integrated investigative approach consisting of water and clay core sample analysis, including
stable isotopes and specific degraders, combined with modeling has been applied. The results showed that the chlorinated solvent TCE was converted into its daughter products but complete conversion to ethene was not achieved within a timeframe of 4 years. Large variation in the effect of ERD in the clay matrix between sites, boreholes and even between cores was observed. Four years post ERD initiation, the mass removal at the 2 sites varied between <5% and 50% within the treated zones. Low mass removal was associated with degradation being restricted to narrow bioactive zones. Bioactive zones may expand and in some cores TCE was depleted in zones up to 1.8 m thick – an extent
which could not be explained by diffusive loss to narrow bioactive zones. Hence, biomass migration in the clay matrix appears to play an important role for contaminant mass reduction.
Original languageEnglish
Publication date2012
Number of pages4
StatePublished - 2012
Event4th Joint Nordic Meeting on Remediation of Contaminated Sites - Oslo, Norway


Conference4th Joint Nordic Meeting on Remediation of Contaminated Sites
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ID: 9824911