Micro-Bac International, Inc.
Bioremediation of PCBs
Project When a building that housed two large electrical transformers was demolished, it was discovered that leaking PCB-contaminated oil had contaminated soil and groundwater. The soil was removed and disposed of, however, 5000 gallons of contaminated water collected from the excavation were stored for later disposal. Although PCB levels were low enough for disposal at a local POTW, the owner wanted to eliminate the PCBs to limit their exposure and save removal costs.
Treatment A 6000-gallon tank was outfitted with a small circulation pump and a commercial hot water heater. Coiled pipes inside the tank allowed the contaminated water to be heated at temperatures between 72 and 78 degrees F. It was determined that an application of 55 gallons of M-1000H*® and four packets of the nutrient OSNF #1 would be administered for 10 days.
Results Initial concentrations of PCB 1260 were at 3 micrograms. After 10 days of circulation, the water was tested and no PCBs were detected. Surfaces inside the tank and circulation system were also tested for PCBs and the results were negative. The M-1000H* treatment saved the client approximately $14,000 in disposal costs.