Vermont Dry Cleaner Remediation Using CL-Out
Cl-Out bioremediation was used to remove PCE from ground water at a dry cleaners in Vermont. CL-Out micorbes were selected for bioremediation of the site because they are compatible with the natural aerobic aquifer conditions. One application of CL-Out bioaugmentation reduced the PCE concentration by 90% in less than 6 months without increasing the vinyl chloride concentrations.
The following table summarizes the process of aerobic cometabolism of PCE. The pre-bioaugmentation sampling showed aerobic conditions and a low population of Pseudomonas microbes. After bioaugmentation the Pseudomonas population was higher. As the microbes consumed the dextrose substrate and produced the oxygenase enzymes necessary for PCE destruction, the ORP and PCE concentrations decreased. Six months after the bioaugmentation, the microbial population returned to the pre-bioaugmentation conditions.