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Chemical Reductive Treatment of Groundwater Chromate and Chlorinated Ethenes: Tests at Two Field Sites
Citation:
SU, C., R. D. LUDWIG, AND R. PULS. Chemical Reductive Treatment of Groundwater Chromate and Chlorinated Ethenes: Tests at Two Field Sites. Presented at 2011 International Conference on Groundwater Contamination and Water System Security, Beijing, CHINA, December 01 - 02, 2011.
Impact/Purpose:
Presentation for the International Conference on Groundwater Contamination and Water System Security in Beijing, China (December 1, 2011 - December 2, 2011)
Description:
Both hexavalent chromium (Cr(VI)) and chlorinated ethenes such as tetrachloroethene (PCE) are common groundwater contaminants. A pump-and-treat approach to remedy them usually is not satisfactory with respect to effectiveness and cost. Effective treatment technologies generally focus on promoting reducing conditions to convert Cr(VI) to the relatively immobile and non-toxic trivalent (Cr(III)) form or to reductively dechlorinate chlorinated ethenes to form non-harmful ethene and ethane via abiotic and biotic pathways. Reducing conditions can be induced by construction of permeable reactive barriers of granular zero valent iron (Wilkin et al., 2005), by subsurface injection of strong chemical reductants such as reduced sulfur compounds alone (Szecsody et al., 2004) and in combination with reduced iron (Su and Ludwig, 2005), by injection of nanoscale elemental iron and palladized iron (Su et al., 2009; He et al., 2010; Kanel et al., 2011), and by injection of organic carbon substrates.