Effect of soil electroosmotic flow enhancement by chelating reagents

Popov, Konstantin; Yachmenev, Val G.; Kolosov, A.Yu.; Шабанова, Н. А.

doi:10.1016/s0927-7757(99)00359-3

Cited by 37 publications

(9 citation statements)

References 12 publications

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“…Furthermore, it was reported by several authors that the presence in the soil of organic compounds such as EDTA or citric acid can modify the superficial soil particle charge, and therefore the zeta-potential, resulting in a rapid increase of the electroosmotic flow during the electrokinetic treatment. This phenomenon was reported especially for citric acid and EDTA [27,28]. Thus, it can be concluded that the cumulative flow collected in the second stage of the Exp.…”

Section: Resultsmentioning

confidence: 59%

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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Section: Resultsmentioning

confidence: 59%

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

2010

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“…When the pH in the sludge was maintained at 12.5, EDTA addition did not induce the movement of either copper or iron species (Figure 6a ). This is due to the formation of insoluble complexes, as reported by Popov et al (1999). On the contrary, at the final pH of 7.7 in the sludge, copper migration towards the anode occurred, which can be attributed to the formation of CuEDTA 2− complexes (Nowack, 2002;Sillanpää et al, 2001).…”

Section: Copper and Iron Migration At Low Cathode Phmentioning

confidence: 65%

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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“…These results were due to the combination of the complexing capacity of citric acid with Mn and the development of an intense electroosmotic flow that was able to transport all the soluble species in the interstitial fluid towards the cathode. As reported in the literature [37,38], citric acid interacts with the soil particles enhancing the development of a high electroosmotic flow. Overall, the treatment with citric acid as the facilitating agent is believed to be the most appropriate for metal removal among the various facilitating agents tested.…”

Section: Enhanced Remediation With Facilitating Agentsmentioning

confidence: 79%

Analysis and Optimization of Mn Removal from Contaminated Solid Matrixes by Electrokinetic Remediation

Cameselle

Gouveia

Cabo

2020

IJERPH

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Electrokinetic remediation is a useful technique for the removal of ionic contaminants in soils, sediments, sludges, and other solid porous matrixes. The efficiency of metal removal and the electricity consumption in the electrokinetic treatment of soils largely depend on electric and physicochemical conditions. This study analyzes the electrokinetic treatment of Mn contaminated kaolinite clay specimen and the influence of voltage, current intensity, moisture content, pH, and facilitating agents on metal removal and energy consumption. The objective of this study is to identify the influence of the typical variables used in electrokinetic remediation. The results showed that the operation at constant voltage or constant current intensity were equivalent in terms of metal removal and energy consumption, as long as the electric field intensity was kept low to minimize the consumption in parallel electrochemical reactions, especially the electrolysis of water. The moisture content had a significant influence on the Mn removal. Moisture content higher that 50 percent resulted in very effective Mn removal as compared with kaolinite specimens with lower moisture. The control of pH in the electrolyte solutions and the addition of facilitating agents (organic acids) enhanced the removal of Mn but increased the electric energy cost. Overall, the best conditions for Mn removal involved low to moderate electric potential difference (10 to 30 V), the use of citric acid as the facilitating agent, and the pH control in the cathode at a slightly acid pH. The electrokinetic treatment of a sludge from a water treatment plant contaminated with Mn was effective when pH control on the cathode was used. Mn and various metals (66% of Mn, 30% of Cu, 56% of Zn, 21% Sr, and 21% of Fe) were removed with moderate electricity and acid consumption.

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Effect of soil electroosmotic flow enhancement by chelating reagents

Cited by 37 publications

References 12 publications

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

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

Electrokinetic Copper and Iron Migration in Anaerobic Granular Sludge

Analysis and Optimization of Mn Removal from Contaminated Solid Matrixes by Electrokinetic Remediation

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