EPA 540/R-93/510a
In Situ Steam Enhanced Recovery Process
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In Situ Steam Enhanced Recovery Process (649K)
ABSTRACT
In Situ Steam Enhanced Recovery Process
SITE Technology Capsule
EPA 540/R-93/510a
August 1995
The In Situ Steam Enhanced Recovery Process (SERP) developed by Hughes Environmental
Systems, Inc., removes volatile organic compounds (VOCs) and semivolatile organic
compounds (SVOCs) from perched groundwater and contaminated soils both above
and below the water table. The technology uses a pressure gradient concept to
extract contaminants from the subsurface. Steam is forced through the soil by
injection to thermally enhance the recovery of organic contaminants. Extraction
wells are used to pump and treat groundwater and to transport steam and vaporized
contaminants to the surface. Extracted vapors are then condensed and treated
by any of several vapor treatment techniques at the surface. This technology
was demonstrated on a 2.3 acre site contaminated with diesel fuel at the Rainbow
Disposal Site, Huntington Beach, California over 2 year period. Up to 40 feet
of soil was treated with 35 injection and 38 extraction wells. The 90% confidence
interval (996-3,570mg/Kg) for TPH after treatment (2,290mg/Kg) indicated that
the technology did not meet the site-specific cleanup criterion of 1,000mg/Kg.
Levels of benzene, toluene, ethylbenzene, and xylenes were below the detection
limit in treated soil.
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Posted February 26, 1999
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