Fjordbøge, Annika Sidelmann2; Lange, Ida Vedel2; Binning, Philip John4; Bjerg, Poul Løgstrup2; Riis, Charlotte7; Christensen, Anders G.7; Terkelsen, Mads6; Kjeldsen, Peter2
1 Water Resources Engineering, Department of Environmental Engineering, Technical University of Denmark2 Department of Environmental Engineering, Technical University of Denmark3 Residual Resource Engineering, Department of Environmental Engineering, Technical University of Denmark4 Office for Study Programmes and Student Affairs, Administration, Technical University of Denmark5 NIRAS A/S6 Capital Region of Denmark7 NIRAS A/S
ZVI-Clay soil-mixing is a relatively new in situ remediation technology for remediation of chlorinated dense non-aqueous phase liquids (DNAPLs). The technology combines abiotic degradation (via zero-valent iron, ZVI, addition) and immobilization (via soil mixing and clay addition), whereby both contaminant mass and contaminant mass discharge can be reduced. The technology was tested at a Danish tetrachloroethene (PCE) site. The field sampling consisted of baseline measurements and a 19-month monitoring program (7 sampling campaigns) subsequent to the implementation of ZVI-Clay soil-mixing. The concentrations of chlorinated ethenes were monitored via soil sampling at the source zone and groundwater sampling at a downgradient control plane. The results showed that within one year ZVI-Clay soil-mixing resulted in significant mass depletion of PCE (2-3 orders in magnitude) with ethene as the main degradation product. The down-gradient reduction of contaminant mass discharge was slower; after 19 months a mass discharge reduction of 76 % was obtained for the parent compound PCE, while the overall mass discharge reduction of chlorinated ethenes was 21 %.
2012 World Congress on Advances in Civil, Environmental, and Materials Research (acem´12), 2012, p. 3470-3475
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World Congress on Advances in Civil, Environmental, and Materials Research (ACEM’12), 2012