PROJECT A-6
In Situ Sub-Surface
Trailer Park, Halifax, MA
PROBLEM:
Kerosene release adjacent to and into a wetland
SOLUTION:
Inject mixture of MicroSorb® SC, Nutrients, and Biocatalyst to treat wetlands soils and ground-water,
and extend treatment equipment life
A pump and treat system was designed to recover a release of kerosene
in a trailer park adjacent to a wetland. The system consisted of a
pumping system which pumped total fluids (NAPL and groundwater) from
seven recovery wells. The majority of the NAPL was removed in two
separator tanks, and the remainder was removed via a coalescing
oil/water separator. The effluent of the separator was processed
through an acti-vated carbon treatment system and discharged to the
wetland under an EPA discharge permit. In February 1997, the wetlands
soils and groundwater were treated by injecting a mixture of
MicroSorb® SC (Super Concentrate), Nutrients, and
Biocatalyst into selected monitoring wells.
RESULTS:
Complete recovery of the impacted wetlands has been documented
Since start-up of the system, over 40 million gallons of groundwater
have been treated, and approximately 38,000 gallons of kerosene have
been recovered. A complete recovery of the impacted wetlands has been
documented since start-up of the system. Between April 1997 and
November 1997, the carbon drums were only changed once. Also,
significant changes were noted in the influent of the oil/water
separator and carbon treatment system since April 1997 (two months
after biotreatment). The amount of biomass in the initial separator
tanks was greatly reduced. Of particular interest, the dissolved
contaminant concentration in the influent to the carbon treatment
system was significantly reduced. Between April 1996 and April 1997
(prior to biotreatment) the average concentration of total BTEX in the
influent samples was 390 ppb and the average concentration of TPH was
22.4 ppm. Between April 1997 and November 1997 (after biotreatment)
the average concentration of total BTEX was 113 ppb and the average
concentration of TPH was 12.1 ppm. These results represent a 71%
reduction in total BTEX and a 45% reduction in TPH.
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