Dense Nonaqueous Phase Liquids (DNAPLs)Chromium VI
Dense Nonaqueous Phase Liquids (DNAPLs)
1,4-Dioxane
Dioxins
Mercury
MTBE
Perchlorate
POPs
PCBs
TCE
Other Contaminants
For more information on the DNAPL Website, please contact:|
|
Treatment Technologies
Direct and Multiphase Recovery
Halogenated Alkenes
Multi-Phase Extraction: State-of-the-Practice
U.S. EPA, EPA 542-R-99-004, 1999
This report describes the state-of-the-practice for MPE of contaminated soil and groundwater, focusing primarily on the application and use of MPE at sites with halogenated volatile organic compounds (VOCs). MPE is an innovative technology that has the potential to be more cost-effective and to remediate sites more quickly than conventional technologies can.
Paul's Classic Drycleaners, Wisconsin
State Coalition for Remediation of Drycleaners
An unknown quantity of PCE was released to the subsurface soil and groundwater. Soils under the site consist of interbedded clay, silt, and sand to approximately 10 ft followed by sand to approximately 35 ft. Along with other treatment systems, ten high vacuum dual-phase wells were used to address residual and free-phase DNAPL in the vadose and saturated zones. Groundwater and extracted NAPL are treated through an air stripper and a diffused aeration tank.
Randolf's Cleaners & Alterations, Tallahassee, Florida
State Coalition for Remediation of Drycleaners
An unknown quantity of PCE was released to the subsurface soil and groundwater. Groundwater occurs between 45 and 55 ft bgs and soil under the site consists of silty to sandy clay from the surface to 20 ft bgs; silty clay to clay from 20-37 ft bgs; silt and fine-grained sand with some clay from 37-53 ft bgs; silty clay interbedded with silt from 53-80 ft bgs; and weathered limestone interbedded with sandy to plastic clay from 80-156 ft bgs.
Given the low permeability of the subsurface, six 5-inch diameter PVC recovery wells screened from 5-70 ft bgs were installed. One-third horsepower Grundfos submersible pumps were used to lower the water table and recover contaminated groundwater while a vacuum was applied to each well.
Johannsen Cleaners Lebanon, Oregon
Oregon Department of Environmental Quality
See also State Coalition for Remediation of Drycleaners
Johannsen Cleaners began operation in 1955. The facility used PCE for its operations. An unknown quality of PCE has been released to the subsurface. Soils beneath the facility consist of alluvium containing gravel and sand with varying amounts of silt and clay. Shallow soil was excavated to 3 ft from the back of the facility but access was limited. A dual-phase extraction system was installed that consisted of three horizontal vacuum-driven extraction wells installed beneath the southern end of the building.
Return to "Direct and Multiphase Recovery Introduction"
Disclaimer
http://www.clu-in.org/sec/Dense_Nonaqueous_Phase_Liquids_(DNAPLs)/cat/
Treatment_Technologies/p/3/n/1
Last updated on Monday, November 10, 2008