Assessing the Cr(VI) reduction efficiency of a permeable reactive barrier using Cr isotope measurements and 2D reactive transport modeling

Journal of Contaminant Hydrology
Christoph WannerUrs Mäder

Abstract

In Thun, Switzerland, a permeable reactive barrier (PRB) for Cr(VI) reduction by gray cast iron was installed in May 2008. The PRB is composed of a double array of vertical piles containing iron shavings and gravel. The aquifer in Thun is almost saturated with dissolved oxygen and the groundwater flow velocities are ca. 10-15m/day. Two years after PRB installation Cr(VI) concentrations still permanently exceed the Swiss threshold value for contaminated sites downstream of the barrier at selected localities. Groundwater δ(53/52)Cr(SRM979) measurements were used to track Cr(VI) reduction induced by the PRB. δ(53/52)Cr(SRM979) values of two samples downstream of the PRB showed a clear fractionation towards more positive values compared to four samples from the hotspot, which is clear evidence of Cr(VI) reduction induced by the PRB. Another downstream sample did not show a shift to more positive δ(53/52)Cr(SRM979) values. Because this latter location correlates with the highest downstream Cr(VI) concentration it is proposed that a part of the Cr(VI) plume is bypassing the barrier. Using a Rayleigh fractionation model a minimum present-day overall Cr(VI) reduction efficiency of ca. 15% was estimated. A series of 2D model simulations...Continue Reading

References

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Feb 25, 2005·Ground Water·Yousheng Zhang, Robert W Gillham
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Aug 1, 1995·Environmental Science & Technology·R M PowellD A Sabatini

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Citations

Nov 17, 2012·Environmental Science & Technology·Julia H Jamieson-HanesDavid W Blowes
Jan 3, 2013·Current Opinion in Biotechnology·Paul B HatzingerNeil C Sturchio
Sep 19, 2020·Environmental Science and Pollution Research International·Alexey SafonovInga Zinicovscaia

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