CL-Out Aerobic PCE Bioremediation Pilot Study Results
A CL-Out bioremediation pilot study confirmed that aerobic PCE cometabolism removed dry cleaning solvent contamination from ground water. The pilot study was located at a former dry cleaners. At the site, the PCE in ground water was 27 parts per billion (ppb). Bioaugmentation introduced CL-Out microbes and dextrose as the metabolic substrate by injected into the ground water up gradient from the sentinal monitoring well. After 30 days the PCE concentration decreased to 20 ppb. After 6 months the PCE concentration decreased to 16 ppb.
As the PCE was decreasing, the site conditions stayed aerobic. The dissolved oxygen level in ground water decreased from 1.07 to 0.71 mg/l. Meanwhile, the ORP decreased from 99 to 45 mv. These aerobic aquifer conditions support the conclusion that the PCE removal was through aerobic bioremediation.
CL-Out cometabolism uses a dioxygenase enzyme that is produced constituatively as the metabolic substrate is consumed. The dioxygenase enzyme destabilizes the carbon bond in the PCE to convert the molecule to an organic acid that leads to complete mineralization.
CL-Out is a consortium of naturally-occurring microbes. The microbes have the benefits of metabolic diversity and environmental stability. They are non-pathogenic and safe for human health and the environment. Click here to find out more about CL-Out bioremediation.