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In situ
chemical oxidation (ISCO) is an innovative
technology that has been used to treat a wide
variety of contaminants. The primary oxidants
that have been used successfully include
hydrogen peroxide, Fenton’s reagent, potassium
and sodium permanganate, sodium persulfate, and
ozone. The viability of applying ISCO at a
particular site is largely dependent on the Soil
Oxidant Demand. SOD is the oxidant consumed by
both organic and inorganic component of the soil
aquifer matrix.
Oxidation Systems has developed
an accurate and reliable test for measuring the
soil oxidant demand. Our soil oxidant demand
test is a quantitative measurement of the amount
of oxidizer that is required to satisfy the
oxidant demand of the soil matrix. We can
perform soil oxidant demand tests for either a
single oxidizer or the full suite - hydrogen
peroxide,
Fenton’s reagent, potassium and sodium
permanganate, sodium persulfate, or ozone. Test
results are typically available in 48 hours. We
can also provide cost estimates for full-scale
implementation of ISCO based on the results of
Soil Oxidant Demand testing.
Natural oxidant demand refers to
the consumption of an oxidant due to reactions
that are unrelated to degradation of the
contaminants of concern (COC). A NOD measurement
is a direct estimate of the oxidant consumption
by organic and inorganic components in the
matrix (soil or water). Natural organic matter
has a high oxidant demand and, therefore, can be
important when estimating the required chemical
dosage. For highly organic soils, chemical
oxidation may not be an economically feasible
technology.
Soil oxidant demand varies with
soil type. Due to the wide variety of matrix
properties that exert an oxidant demand, it is
difficult to determine the soil oxidant demand
based on laboratory analysis of such parameters
as total organic carbon, metals, COD, and BOD.
In addition, each oxidizer reacts differently
with different soils. It is, therefore,
essential to conduct site-specific testing to
determine the soil oxidant demand for a
particular site.
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