Steam Enhanced LNAPL/CVOC Extraction
| Location: |
Danville, Pennsylvania |
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| Value: |
$
6,500,000.00 |
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Panther was contracted to design, install and operate a steam enhanced soil and groundwater vapor extraction system to recover separate phase LNAPL and DNAPL impacting 55,000 CY at a former automotive manufacturing facility. The remedy designed and installed included one hundred twenty four 2-inch stainless steel injection wells and forty three 4-inch stainless steel extraction wells to a maximum depth of 40-feet bgs.
Following installation of the injection and extraction wells, main surface mounted 4-inch carbon steel headers were installed and connected to each well through 2-inch SS branch hoses. Injection wells were connected to a main 8-inch distribution manifold that originated at a 37,500 lb/hour 150-psi natural gas fired steam boiler. The steam boiler and potable water softening systems were designed and sized with the goal of increasing subsurface temperature to approximately 100-degrees C to enhance the mobility of viscous DNAPL and LNAPL into the extraction and treatment system. The 260-gallon per minute (GPM) groundwater extraction system was comprised of a 130-cfm compressor, 26 custom designed high temperature pneumatic pumps, 21,000 gallon initial settling/gross product removal tank, twin 150-gpm treatment trains in parallel consisting of polishing oil/water separators, duplex bag filtration systems, counter flow air stripper systems, potable water preheat recovery system and liquid phase granular activated carbon for low-level PCB removal. The vapor extraction systems at the site consisted of shallow fill layer 300-cfm high vacuum dual phase extraction and moisture separation systems targeting two separate treatment zone to 15 and 20-feet deep and a 750-cfm rotary lobe SVE system with moisture separator to treat soil in the deep aquifer from approximately 20 – 40’ bgs. Following initial moisture separation, vapors were combined into one equalization vessel with demisting for final moisture removal prior to treatment within a 3,000 cfm regenerative thermal oxidizer and HCL scrubber system. |
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