In-Situ: Dual Phase Extraction (DPE)

Thursday, September 9, 2010 by August Mack Environmental, Inc.

The in-situ remediation technology of dual phase extraction (DPE) is also known as multi-phase extraction or vacuum-enhanced extraction. During DPE, the following occurs:

  • DPE uses vacuums to remove contaminated groundwater, free-phase product and contaminated vapors from soils.
  • Extracted liquids and vapor are treated and collected for disposal.
  • DPE pulls air through pore space in contaminated soils and pulls contaminated groundwater and free product from the same well location.
  • Requires permits for discharge of water into POTW or back into the ground.
  • May require permits for the discharge of treated vapors to the atmosphere.
  • DPE requires regularly-scheduled O&M and sampling.
  • Effectiveness depends on type of soils and depths of groundwater.
The advantages of DPE are the following:
  • Minimal disturbance to site operations.
  • Medium length treatment timeframes.
  • Flexible applications.
  • Can aid in the continuous removal of free product.
  • Can be utilized underneath of structures.
  • Proven performance.
  • Agency-accepted cleanup technology.
  • Containment technology.
The disadvantages of DPE are the following:
  • Requires extensive knowledge of subsurface conditions (pilot test).
  • Above-grade equipment and associated noise.
  • Requires continual O&M and sampling.
  • Extracts a large volume of groundwater.
  • Treatment techniques for vapors removed from soil may be expensive.
  • Seasonal temperature changes may affect performance.

For more information on DPE, contact one of the environmental assessment and remediation specialists at August Mack Environmental at 800.579.0770.

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