Dual-Phase Extraction (DPE) is an in-situ remediation technology designed to remediate soils and groundwater impacted with volatile organic compounds (VOCs), including gasoline range organics and chlorinated hydrocarbons. This technology works by extracting soil vapor and groundwater from the subsurface using vertical wells at a high vacuum. The groundwater levels are lowered and soil/groundwater are remediated through the following mechanisms: (1) capture of soil gas in the vadose zone; (2) pneumatic control (and capture) of soil gas; (3) mass transfer and volatilize VOCs to soil gas; (4) desorption of VOCs adsorbed to the soil; and (5) hydraulic control and capture of impacted groundwater. The dual-phase flow (soil vapor/water) is extracted from the DPE wells and both phases are separated using a knockout tank. Each stream is treated to remove VOCs prior to air and water discharge.
The construction, and operation of DPE systems require permitting and operation in compliance with water protection regulations and air emissions regulations.
DPE Engineering Services
DPE services include the following:
- Feasibility Studies
- Remedial Action Plan
- Pilot Testing
- Regulatory Support and Permitting
- Remediation System Design
- Operation and Maintenance Manuals
- Operation and Maintenance
- Remediation System Optimization
- Estimation of Mass Removal Rates
- Biodegradation and Microbiological Tests
- Reporting to Clients and Regulatory Agencies
- Annual Performance Assessment Reports