Pulsed Electrokinetic Decontamination of Agricultural Lands around Abandoned Mines Contaminated with Heavy Metals

Ryu, Byung-Gon; Park, Sung Woo; Baek, Kitae; Yang, Jung‐Seok

doi:10.1080/01496390902983778

Cited by 47 publications

(33 citation statements)

References 17 publications

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“…By contrast, electrokinetic (EK) remediation is a low-cost method that can be used on soil with poor permeability and can be applied in situ [15][16][17][18][19]. The EK process involves direct application of a low voltage gradient or electrical current to polluted soil through installed electrodes [20][21][22][23].…”

Section: Introductionmentioning

confidence: 93%

Electrokinetic restoration of saline agricultural lands

2010

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Salinization of greenhouse soils has become a serious problem in Korea because of the extensive use of chemical fertilizers to improve crop yield. This study investigated the feasibility of electrokinetic (EK) treatment for reclamation of saline soil. Experiments were conducted using voltage gradients of 1, 2, and 3 V/cm applied for 48 and 96 h. Anions such as chloride, sulfate, and nitrate were transported toward the anode and accumulated there, whereas cations were transferred toward the cathode by electromigration. Among the various ions, the highest removal efficiency was achieved for nitrate: [80% at 48 h and [99% at 96 h. Chloride removal after 96 h was substantially higher than that after 48 h because the longer period of time allowed more electrical transport via electromigration and electro-osmosis. However, the removal efficiency for sulfate and calcium did not change significantly between 48 and 96 h. Soil EC was lower than the initial value in all soil sections at 96 h. The lowest value, 1.8 dS/m, was seen in the experiment employing a gradient of 3 V/cm for 48 h. This study demonstrated that nitrate can be readily removed from soil by electromigration. Further, other ions can also be removed by EK treatment; therefore, it could be successfully used for reclamation of saline soils.

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Section: Introductionmentioning

confidence: 93%

Electrokinetic restoration of saline agricultural lands

2010

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“…Reddy and Saichek found that application of periodic electric potential increased phenanthrene solubilization and mass transfer [10]. In addition, Kornilovich et al [19,25] reported that pulsed regimes have similar removal efficiency compared to constant regimes but provide noticeable electrical energy savings due to pause time.…”

Section: Introductionmentioning

confidence: 98%

“…In this study, a pulsed power supply was used to increase extraction of heavy metals from the soil surface and to decrease polarization and electrical energy consumption by periodically supplying an electric field [19]. Rojo and Hansen have reported on the effectiveness of electrodialytic remediation with a pulsed electric field for removing copper from mine tailings [24].…”

Section: Introductionmentioning

confidence: 99%

“…In order to enhance the mobility and removal of heavy metals in electric fields, several techniques have been applied to electrokinetic systems, such as control of the pH of the electrolyte to prevent metal-hydroxide precipitation [19][20][21][22], use of various chelating reagents [7,9], ionexchange membranes [13,20], the polarity exchange technique [23], and pulsed voltage [19,24,25]. In this study, a pulsed power supply was used to increase extraction of heavy metals from the soil surface and to decrease polarization and electrical energy consumption by periodically supplying an electric field [19].…”

Section: Introductionmentioning

confidence: 99%

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Pulsed electrokinetic removal of Cd and Zn from fine-grained soil

et al. 2009

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Pulsed electrokinetics studies were carried out to optimize the removal of Zn and Cd from fine-grained soils and to observe the effects of varying the pulse frequency, pulse time ratio (on/off), and DC voltage gradient. Existing forms of heavy metals in the soil matrix were determined using a sequential extraction method. The strongly bound fraction (bound to organic matter and residuals) that is difficult to remove from the soil matrix comprised 74 and 62% of the total Zn and Cd, respectively. In the electrokinetic remediation experiments, MgSO 4 was employed to increase the ionic strength of the soil for 2 weeks. Transportation of heavy metals was influenced by the frequency, pulse ratio, and the voltage gradient of the pulsed electric field. Extraction efficiency of Zn and Cd near the anode was correlated positively with the voltage gradient at a given pulse and ratio. A high pulse frequency (1,800 cycles/h) enhanced the removal efficiency of the heavy metals compared to a low pulse frequency (1,200 cycles/h) at a supplied voltage gradient of 1 V/cm. Although pulsed electrokinetics was more effective in extracting and desorbing ions near the anode than conventional electrokinetics, its ability to transport heavy metals from the anode to the cathode was relatively small. Total removals with pulsed electrokinetics were 21-31% for Zn and 18-24% for Cd. In summary, pulsed electrokinetics can enhance removal efficiency of heavy metals and is beneficial with regard to electrical energy consumption.

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“…식물정화법은 처리기간이 길며 식물의 뿌리를 통 하여 중금속을 추출하기 때문에 적용 범위의 한계성을 지 니고 있다 Ryu et al, 2010). 이러 한 이유로 최근에는 점토와 같은 저투수성 토양에서도 중 금속 등의 오염물질 제거가 가능한 전기동력학적 정화기 술에 대한 연구가 활발히 이루어지고 있다 (Acar et al, 1995;Baek et al, 2007;Kim et al, 2009a;Park et al, 2009b;Ryu et al, 2009;Ryu et al, 2010;Kim et al, 2011a;Kim et al, 2012).…”

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Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

Park¹,

Kim²,

Kim

et al. 2013

Journal of Soil and Groundwater Environment

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The influence of processing fluids and electrode spacing on the electrokinetic process was evaluated to remediate As-, Cu-, Pb-contaminated soil. Single and mixture of sodium citrate, EDTA and NaOH was used to investigate the metal extraction. EDTA for washing reagent showed the highest removal efficiency. Based on the extraction result, the electrode spacing (20, 40, 60 cm) on the electrokinetic process was investigated to remove the multi-metals from soil. The highest removal was observed at the experiment with 60 cm of electrode spacing, however, the correlation between electrode spacing and removal of metals was not clear. The electrode spacing influenced the amount of accumulated electro-osmotic flow. BCR sequential extraction showed that electrokinetic process removed the fractionation of metals bound to Fe-Mn oxyhydroxide.

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Pulsed Electrokinetic Decontamination of Agricultural Lands around Abandoned Mines Contaminated with Heavy Metals

Cited by 47 publications

References 17 publications

Electrokinetic restoration of saline agricultural lands

Electrokinetic restoration of saline agricultural lands

Pulsed electrokinetic removal of Cd and Zn from fine-grained soil

Evaluation of Electrolyte and Electrode Spacing for Application of Electrokinetic Remediation

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