Loading...
Publication
Biocomplementation of SVE to achieve clean-up goals in soils contaminated with toluene and xylene
| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 383.86 KB | Adobe PDF |
Advisor(s)
Abstract(s)
Soil vapor extraction (SVE) and bioremediation
(BR) are two of the most common soil remediation
technologies. Their application is widespread; however,
both present limitations, namely related to the efficiencies
of SVE on organic soils and to the remediation
times of some BR processes. This work aimed to study
the combination of these two technologies in order to
verify the achievement of the legal clean-up goals in soil
remediation projects involving seven different simulated
soils separately contaminated with toluene and xylene.
The remediations consisted of the application of SVE
followed by biostimulation. The results show that the
combination of these two technologies is effective and
manages to achieve the clean-up goals imposed by the
Spanish Legislation. Under the experimental conditions
used in this work, SVE is sufficient for the remediation
of soils, contaminated separately with toluene and xylene, with organic matter contents (OMC) below
4 %. In soils with higher OMC, the use of BR, as a
complementary technology, and when the concentration
of contaminant in the gas phase of the soil reaches
values near 1 mg/L, allows the achievement of the
clean-up goals. The OMC was a key parameter because
it hindered SVE due to adsorption phenomena but enhanced
the BR process because it acted as a microorganism
and nutrient source.
Description
Keywords
Toluene Xylene Soil vapor extraction Bioremediation Organic matter Water content Remediation time