Description
Project: Former Agricultural Site Florida, USA
Confidential Client
Summary
In November 2004, Adventus conducted a 2,600-ton in situ pilot-scale
technology validation project using Adventus' patented DARAMEND® technology
to remove organochlorine pesticides from impacted soils at a former
agricultural site in Florida. The treatment area consisted of two
treatment plots identified as North and South, each containing a 1-foot
layer of soil with elevated concentrations of dieldrin.
The remedial goal was met in a 2-3 week period and subsequent field
monitoring showed that soil dieldrin concentrations decreased by 67% in
that period at a total project cost of approximately $12.50/yd3.
The Challenge
Results from the site characterization sampling indicated an average
initial soil dieldrin concentration of 45.9 µg/kg in the treatment plots.
The remedial objective was to treat the dieldrin to below 15 µg/kg.
The Solution
Two sequential DARAMEND treatments consisting of sequential anoxic and
oxic conditions were applied. These conditions were generated through the
application of DARAMEND amendments (0.5 % by weight), which were applied
to the soil surface and incorporated to a depth of 1 foot with a
tractor-driven deep rotary tiller or disc (Figure 1).
After amendment incorporation, water was applied to bring the soil
moisture content up to 90% of the soil water- holding capacity
(Figure 2). These steps were repeated for the second
treatment cycle. Each cycle consisted of an eight day anoxic phase,
followed by a two day oxic phase.
Figure 1: In-place application of DARAMEND
Figure 2: Irrigation to meet optimal soil moisture amendment.
The Result
The soil dieldrin decreased from an average of 45.9 µg/kg to 15.1 µg/kg
in two treatment cycles, which comprises a removal rate of 67%
(Figure 3). A third treatment cycle was able to reduce
the concentration by 85 to 90%. Figure 3: Rapid, Cost-Efficient and
Effective DARAMEND Bioremediation of dieldrin-impacted soil.
The Time Line and Cost
The remedial objective was reached within a 2-3 week period at a total
project cost of approximately $12.50/yd³.
Companies On This Project
ADVENTUS GROUP
