ABSTRACT
A significant level of enhanced biological reductive dechlorination was demonstrated at a commercial dry cleaning facility in Orlando, Florida. The upper portion of the surficial aquifer at the site was treated with an experimental source of time-release hydrogen (HRC®, Regenesis Bioremediation Products, Inc.). The hydrogen, which is produced by fermentation from HRC derived organic acids, serves as an electron donor that mediates the reduction of chlorinated hydrocarbons. The upper portion of the surficial aquifer at the site generally consists of sand and silty sand to a depth of approximately 29 feet below land surface. The total PCE contaminant mass was reduced by 96 percent after 152 days. Additionally, groundwater concentrations of the daughter products trichloroethene (TCE), dichloroethene (DCE) and vinyl chloride all declined.
