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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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