Data from: Effect of chemical additives on electrokinetic remediation of Cr-contaminated soil coupled with a permeable reactive barrier

Chromium(Cr) contamination in soil, especially Cr(VI) has a serious threat
to the environment and human health. The electrokinetic remediation (EKR)
is a promising technology to remediate the Cr(VI). Therefore, EKR coupled
with a permeable reactive barrier (PRB) was used to treat the Cr(VI)
contaminated soil in this study. The CTMAB-Z, a modified zeolite (prepared
by cetyl trimethyl ammonium bromide) alone and a mixture of CTMAB-Z and
Fe(0) were used as PRB-1 and PRB-2 reactive media, respectively. The
effect of chemical enhancers/additives i.e. dl-tartaric acid and tween 80
on EKR of Cr(VI) was also analysed in the contrasting experiments. While,
the effects of repair time, voltage gradient and dl-tartaric acid
concentration on Cr(VI) remediation were investigated by utilizing
multifactor orthogonal experiment which was based on contrasting
experiments. The contrasting experiment results showed that the highest
Cr(VI) removal rate(66.27%) and leaching efficiency(71.29%) were observed
in the experimental group which had dl-tartaric acid and PRB-2.
Furthermore, the multifactor orthogonal experiment results had depicted
that the highest Cr(VI) removal rate(80.92%) and leaching
efficiency(85.25%) were achieved after treating the samples at a voltage
gradient of 2.5 v/cm for 8 days in presence of 0.15 M concentration of
dl-tartaric acid. This study demonstrated that Cr(VI) remediation through
EKR process could be significantly enhanced by the use of PRB and
additives.