Lowell, Massachusetts: Thermal Treatment of Chlorinated Solvents

GEO used Gas Thermal Remediation in Lowell, Massachusetts, to address TCE, 1,1,1-TCA, and their degradation products. The approximately 14,100-square-foot target area extended from the surface toward bedrock in layered sands, silts, and clay. Groundwater was encountered at approximately 21 feet below ground surface.

The thermal-remediation well field at the Lowell, Massachusetts project.

The system included 126 thermal conduction heater wells, 67 soil vapor extraction wells, and 52 multiphase extraction wells. C3 Technology and activated carbon treated extracted vapor, with a separate wastewater treatment system for recovered water.

The case study lists a 100°C target temperature and 160 days of heating. It reports an average contaminant reduction of 96%, with every contaminant exceeding the 80% reduction goal. The summary separately reports greater than 91.7% TCE mass removal and greater than 99.99% TCA mass removal.