Effects of soil composition on the removal of chromium by electrokinetics

Reddy, Krishna R.; Parupudi, Usha S.; Devulapalli, Srinivas; Xu, Charlie Yu

doi:10.1016/s0304-3894(97)00020-4

Cited by 165 publications

(71 citation statements)

References 21 publications

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“…A theoretical and experimental basis on electrokinetic sedimentation is explained by Shang [5]. Reddy et al [100] investigated the effects of soil composition on the electrokinetic extraction of chromium (VI). They used three kinds of soil minerals such as kaolin, glacial till, and Na-montmorillonite in their study.…”

Section: Parameter Effectsmentioning

confidence: 99%

Electrokinetics and soil decontamination: concepts and overview (Review)

Karim

2014

J. Electrochem. Sci. Eng.

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Section: Parameter Effectsmentioning

confidence: 99%

Electrokinetics and soil decontamination: concepts and overview (Review)

Karim

2014

J. Electrochem. Sci. Eng.

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“…This indicates that the soil possesses high acid buffering capacity. Figure 1 shows the schematic of the test setup [26] used for this study to perform hydraulic flushing or combined hydraulic flushing-electrokinetic experiments. The test setup consisted of an electrokinetic cell, two electrode compartments, two electrode reservoirs, a power source, and a multimeter.…”

Section: Soil Characterizationmentioning

confidence: 99%

Integrated electrokinetic-soil flushing to remove mixed organic and metal contaminants

2010

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The integrated use of hydraulic flushing and electrokinetic treatment was investigated for the remediation of silty sand contaminated by both PAHs and heavy metals. The soil was collected from a polluted former manufactured gas plant (MGP). Four bench-scale experiments were conducted to analyze the ability of the combined hydraulic flushing and the electrokinetic treatment for the simultaneous removal of PAHs and heavy metals. Sequential flushing with ethylenediaminetetraacetic acid (EDTA) or Igepal CA-720 were tested with or without the simultaneous application of a low intensity direct electric field (1 VDC cm -1 ). The best results were obtained with 0.2 M EDTA flushing in two stages (without and with voltage gradient, 1 VDC cm -1 ), followed by 5% Igepal flushing in two stages (without and with 1 VDC cm -1 ). Heavy metals were removed mainly during the EDTA flushing, with removal efficiencies of about 60% for Zn, 80% for Pb, and 30% for Cu. During Igepal flushing, no heavy metals were removed, but PAHs were removed, including 40% phenanthrene, 30% pyrene, and 20% benzo[a]pyrene. Overall, this study showed that a carefully designed sequential hydraulic flushing scheme with selected chelant and surfactant is needed for the removal of both heavy metals and PAHs from MGP silty sands. Combining electrokinetics with hydraulic flushing may not necessarily improve contaminant removal from such soils.

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“…The added Cu(NO 3 ) 2 was assumed to adsorb onto the sludge granules or to form complexes mainly with organic matter, which are relatively mobile in the electric field. The Cu(NO 3 ) 2 (and Na 2 H 2 EDTA) containing solution was in contact with the biomass for 48 h (Reddy et al, 1997), during which it was thoroughly mixed. After the contamination procedure was over, this sludge, still suspended in the copper (EDTA) containing supernatant unless specified otherwise, was mounted in the electrokinetic set-up.…”

Section: Source Of Biomassmentioning

confidence: 99%

Electrokinetic Copper and Iron Migration in Anaerobic Granular Sludge

Virkutytė

Sillanpää

Lens

2006

Water Air Soil Pollut

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Abstract. The application of low-level direct electric current (0.15 mA cm −2 ) as an electrokinetic technique to treat copper-contaminated mesophilic anaerobic granular sludge was investigated. The sludge was obtained from a full scale UASB reactor treating paper-mill wastewater and was artificially contaminated by Cu(NO 3 ) 2 or CuEDTA 2− with initial copper concentrations of 1000 mg · kg −1 wet sludge. The effect of different electrokinetic cell layouts, pH and EDTA concentrations on the migration of copper and iron during electrokinetic treatment were evaluated. Both, the pH of the sludge cake or the copper complexation with EDTA significantly affected the migration direction of copper.In an 'open' cell (sludge cake in direct contact with air), the highest copper mobility was observed at pH 2.5 in both Cu(NO 3 ) 2 or CuEDTA 2− amended sludge. The highest copper accumulation was at the cathode (22 ± 2)% with CuEDTA 2− as contaminant. In a 'closed' cell (sludge cake not in contact with air), the highest accumulation was obtained for CuEDTA 2− at the anode and amounted to 4(± 0.5)% and 2(± 0.05)%, respectively, at a final pH of 4.2 and 7.7 in the sludge cake.

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Effects of soil composition on the removal of chromium by electrokinetics

Cited by 165 publications

References 21 publications

Electrokinetics and soil decontamination: concepts and overview (Review)

Electrokinetics and soil decontamination: concepts and overview (Review)

Integrated electrokinetic-soil flushing to remove mixed organic and metal contaminants

Electrokinetic Copper and Iron Migration in Anaerobic Granular Sludge

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