Implementing and Interpreting the Full Scale Zero Valent Iron and Anaerobic Reductive Dechlorination of Trichloroethene

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ABSTRACT: Enhanced reductive dechlorination and micro-scale zero valent iron injections were implemented to treat chlorinated volatile organic compounds at a former manufacturing facility in eastern Pennsylvania.  These remedial approaches, commonly implemented as stand alone technologies, were combined to achieve synergistic reductions of trichloroethene and its reaction products.  The assessment of remedial efficacy frequently becomes problematic with the mixed biotic and abiotic processes.  The processes of valuing and validating field and laboratory data across a heterogeneous site such that an understanding of the efficacy of the implemented mixed technologies may occur presents interpretative challenges.  The quarterly analytical evaluation of the targeted chloroethenes for the year after the injection event presents varied removal rates and trending, with inconsistent reductions in targeted compounds.  The variance between the wells’ data and their responses offer an insight into the influences on a remedial program.  The interpretation of the appearance and disappearance of the parent and reaction compounds as they relate to field parameters and geochemical analysis, allows for a more complete understanding of the remedial processes across the site.  By correlating all the available data on a well-by-well basis, a better and more thorough appreciation of the dynamic interactions between these synergistic technologies can be understood.

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