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Former
Raritan Arsenal
Edison, New Jersey, USA
Project
Bioremediation of TNT & DNT in Homogenized
Soil
Summary
DARAMEND® bioremediation technology was
applied at pilot scale to approximately 100 tons
of soil from the former Raritan Arsenal in
Edison, New Jersey. Area 4 at the Raritan Arsenal
was formerly used as a high explosives salvage
and melt-out area from World War I through the
1920s.
The Challenge
Homogenized soil from the site contained
approximately 600 mg/kg of TNT/DNT.
The Solution
Soil excavated from Area 4 was placed in an
Engineered Biotreatment Cell (EBC) constructed in
a small building on the former arsenal property.
The EBC was built using portable barrier walls
overlain with a 40-mil HDPE liner. The liner was
protected with an 8-inch layer of sand, and a
2-foot layer of soil from Area 4 was placed on
the sand layer. The EBC also included an
irrigation system and decontamination pad.
Because the pilot was conducted in the winter
months, the building was insulated and
heated.
The Result
The pilot was scheduled to run for about 75 days.
After 28 days of treatment, however, TNT
concentrations had been reduced to an average of
74 mg/kg and amino-DNT was reduced to 25.9 mg/kg.
These levels met the proposed Remedial Goals for
the site. After 56 days, the concentration of TNT
was reduced to <5 mg/kg and amino-DNT was
reduced to <3 mg/kg. Because of rapid rate of
treatment, the demonstration ended after only 56
days.
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Figure
1:Influence of DARAMEND®
treatment on TNT concentrations in soil at the
former Raritan Arsenal, Edison, NJ |
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The Cost
Based on the results of the pilot demonstration,
full-scale treatment costs were estimated at
$68/ton of soil treated. This estimate assumed
that the soil treated during the
pilot-demonstration was representative of the
entire site and that a total of approximately
5,000 tons of soil would be treated. Estimated
treatment costs included all construction costs
for the treatment cell, manufacture and delivery
of all amendments and turnkey application of the
technology to site soil. The estimate excluded
excavation, UXO clearance, delivery of the soil
to the treatment cell, and confirmatory
analytical cost.
The Timeline
Treatment cell construction began on November 8,
1998 and continued through December 2, 1998.
Immediately following construction the
pilot-demonstration was initiated. Four fourteen
(14) day treatment cycles were applied to the
soil, and treatment was completed on February 5,
1999. A short break (8 days) was scheduled late
in December 1998. |
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