Electrokinetic remediation of chromium- and cadmium-contaminated soil from abandoned industrial site

Lu, Ping; Feng, Qian; Meng, Qingjun; Yuan, Tao

doi:10.1016/j.seppur.2012.07.010

Cited by 91 publications

(29 citation statements)

References 21 publications

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“…During the progress of the experiments, the current displayed the same tendency in both Test 1 and Test 2; that is, to increase up to a maximum value, and then decrease until reaching a steady state. This was similar to the findings reported in some previous studies (Reddy et al, 2006;Al-Hamdan and Reddy, 2008;Tsai et al, 2010;Lu et al, 2012). In Test 1, the electric current increased during the first 72 hr after the voltage had been applied, decreased between 72 and 96 hr, and then plateaued after 96 hr (3.4-8.9 mA).…”

Section: Variation Of the Electric Currentsupporting

confidence: 91%

An assessment of the effectiveness and impact of electrokinetic remediation for pyrene-contaminated soil

Guo

et al. 2014

Journal of Environmental Sciences

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Section: Variation Of the Electric Currentsupporting

confidence: 91%

An assessment of the effectiveness and impact of electrokinetic remediation for pyrene-contaminated soil

Guo

et al. 2014

Journal of Environmental Sciences

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“…Acidification of soil pH was beneficial for solubilization and removal of metal(loid)s such as Pb, Cr, Cd, As, Cu and Zn (Altin and Degirmenci, 2005; Iannelli et al, 2015; Lu et al, 2012; Virkutyte et al, 2002). It was reported that the SOL Pb was dramatically increased in soil stimulated by EKF and the phytoremediation could remove 95% of Pb with the optimization of electrical field intensity and stimulation period (Yang and Lin, 1998).…”

Section: Resultsmentioning

confidence: 99%

Electro-kinetic remediation coupled with phytoremediation to remove lead, arsenic and cesium from contaminated paddy soil

Mao

Han

Shao

et al. 2016

Ecotoxicology and Environmental Safety

105

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The objectives of this study were to investigate distribution and solubility of Pb, Cs and As in soils under electrokinetic field and examine the processes of coupled electrokinetic phytoremediation of polluted soils. The elevated bioavailability and bioaccumulation of Pb, As and Cs in paddy soil under an electrokinetic field (EKF) were studied. The results show that the EKF treatment is effective on lowering soil pH to around 1.5 near the anode which is beneficial for the dissolution of metal(loid)s, thus increasing their overall solubility. The acidification in the anode soil efficiently increased the water soluble (SOL) and exchangeable (EXC) Pb, As and Cs, implying enhanced solubility and elevated overall potential bioavailability in the anode region while lower solubility in the cathode areas. Bioaccumulations of Pb, As and Cs were largely determined by the nature of elements, loading levels and EKF treatment. The native Pb in soil usually is not bioavailable. However, EKF treatment tends to transfer Pb to the SOL and EXC fractions improving the phytoextraction efficiency. Similarly, EKF transferred more EXC As and Cs to the SOL fraction significantly increasing their bioaccumulation in plant roots and shoots. Pb and As were accumulated more in plant roots than in shoots while Cs was accumulated more in shoots due to its similarity of chemical properties to potassium. Indian mustard, spinach and cabbage are good accumulators for Cs. Translocation of Pb, As and Cs from plant roots to shoots were enhanced by EKF. However, this study indicated the overall low phytoextraction efficiency of these plants.

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“…could be transported toward the cathode and naturalize generated OH -ions to some extent (Kim et al 2010). Acidification of soil pH was beneficial for solubilization and removal of metal(loid)s such as Pb, Cr, Cd, Cu and Zn (Altin and Degirmenci 2005;Iannelli et al 2015;Lu et al 2012;Virkutyte et al 2002). In addition, addition of organic acids may neutralize the OH -to some extent and avoided the precipitation of metal(loid)s in the vicinity of the cathode (Lee and Yang 2000;Saichek and Reddy 2003).…”

Section: Effect Of the Electrokinetic Field (Ekf) On Soil Phsmentioning

confidence: 99%

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

Mao

Han

Shao

et al. 2016

Int. J. Environ. Sci. Technol.

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The objectives of this study were to investigate fractionation, solubility and potential bioavailability of Pb, As and Cs in Mississippi River Delta paddy soil under an electrokinetic field (EKF). Effects of EKF on soil pH changes and solid-phase distributions of metal(loid)s were examined. Results showed that fractionation of Pb, As and Cs was largely determined by the nature of elements, loading levels and EKF treatment. Native Pb in the soil was mostly in the amorphous iron oxide, organic matter and residual fractions, native As in the amorphous iron oxide, easily reducible oxide and residue fractions while native Cs in the residue fraction. Added Pb, As and Cs showed distinguished solid-phase distributions: Pb dominantly in the organic matter fraction; As in the amorphous iron oxide fraction, and Cs in the residue with a significant watersoluble plus exchangeable fraction. EKF treatment is effective on lowering soil pH to 1.5 near the anode due to water electrolysis releasing proton which is beneficial for dissolution of metal(loid)s, increasing their overall solubility. The acidification in the anode soil efficiently increased the water-soluble Pb and the exchangeable Cs, implying enhanced solubility and elevated their overall potential bioavailability in the anode region while lower solubility in the cathode area. The building up of watersoluble As in the anode region may be from electromigration of As anion from the cathode. This study shows significant enhancement of redistribution, elevated solubility and overall bioavailability of Pb, As and Cs in Mississippi Delta paddy soil under the EKF.

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Electrokinetic remediation of chromium- and cadmium-contaminated soil from abandoned industrial site

Cited by 91 publications

References 21 publications

An assessment of the effectiveness and impact of electrokinetic remediation for pyrene-contaminated soil

An assessment of the effectiveness and impact of electrokinetic remediation for pyrene-contaminated soil

Electro-kinetic remediation coupled with phytoremediation to remove lead, arsenic and cesium from contaminated paddy soil

The distribution and elevated solubility of lead, arsenic and cesium in contaminated paddy soil enhanced with the electrokinetic field

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