One of the main benefits associated with In-Situ Chemical Reduction science is its unique ability to provide safe, rapid and complete remediation (i.e., without dead-end accumulation of potentially problematic catabolites). Responsible environmental consultants and engineers are learning (sometimes the “hard way”) that there are important differences between ISCR and conventional ERD remediation that uses via emulsified oils or sources of carbon-only (hydrogen releasing compounds).
This telling report (ca. August 2008) by the U.S. EPA and in association with MACTEC’s Harding Environmental Science and Engineering Division, reveals some intriguing results. Notable quotes include:
“After a few months of contact with the HRC® there was clear evidence of conversion of TCE to cis-1,2-DCE (DCE). Although the treatment did achieve extensive conversion to DCE (~80%-95%+ in individual critical wells) the GW-1 criteria were not achieved at the downgradient monitoring wells even though the treatment was allowed to continue for about two years. In fact, DCE continued to increase for most of that time before production of VC became apparent; VC concentrations were still increasing when the project was considered complete.”
For full report - please see
http://www.adventusgroup.com/pdfs/competitive/SITE_HRC_Eval_AUG08.pdf
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