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Electrokinetic remediation of perchloroethylene-contaminated soil
Gholami, M.; Yousefi Kebria, D. & Mahmudi, M.
Abstract
One large group of persistent and toxic contaminants
is the hydrophobic organic contaminants.
Among them, perchloroethylene (PCE) has been recognized
as a representative group of these pollutants with
low solubility. This study reports on the effects of electrokinetic
remediation with non-ionic surfactant on PCEcontaminated
soil. The performance of electrokinetic
process was investigated in the treatment of clay soil that
artificially contaminated with two levels: 10,000 and
30,000 mg/kg PCE and 0.33 g/kg Triton X-100. A DC
power supply with electric voltage (1 V/cm) was used for
8–16 days. A negatively charged soil surface resulted in a
more negative zeta potential and greater electroosmotic
flow toward the cathode. The PCE was measured after
extraction using n-hexane and analyzed by Fourier
transform infrared spectroscopy instrument. The water
content of soil was kept 25 % (w/w). Results were shown
that PCE removal efficiency achieved was 74 and 89 %
for 10,000 and 30,000 mg/kg PCE, respectively, for
16 days. Therefore, in this study, the integration of electrokinetic
with non-ionic surfactant as a hybrid method
was most effective for the remediation of PCE-contaminated
soils.
Keywords
Soil; Electroosmosis; Direct current electric voltage; Non-ionic surfactant; Perchloroethylene
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