Electrokinetic Remediation of Unsaturated Soils

Lindgren, Eric R.; Mattson, Earl D.; Kozák, Miklós

doi:10.1021/bk-1994-0554.ch003

Cited by 14 publications

(5 citation statements)

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“…En el presente trabajo, la concentración de fosfato en el suelo no aumentó, sino que disminuyó, probablemente por su utilización por las bacterias del suelo al biodegradar los hidrocarburos. La presencia de calcio es otro de los motivos por los que pudo disminuir su concentración, por las mismas razones determinadas por Schmidt La electroósmosis en un suelo se encuentra en función del grado de saturación, por ello es un factor primordial en la EBR [26]. Los sistemas saturados tienen el problema de mantener constante la humedad, y la circulación del agua también elimina hidrocarburos obteniéndose un volumen de líquido contaminado que posteriormente debe ser remediado.…”

Section: Resultado Y Discusiónunclassified

Electrobioremediation of an unsaturated soil contaminated with hydrocarbon after landfarming treatment

Acuña

Tonin

Pucci

et al. 2010

Port. Electrochim. Acta

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The electro-bioremediation is a technique that is used for the remediation of hydrocarbon contaminated soils. The aim of this study is to explore the electrobioremediation of an unsaturated soil, contaminated with hydrocarbon waste generated by the oil industry activity in the area and previously remediated by landfarming, to in order to increase the removal of polyaromatic hydrocarbons. The sample was put in a three-compartment electro-bioremediation glass cell of 58 cm long, the lateral compartments containing the electrolyte; we used bridges of ammonium phosphate to connect the electrolyte with the soil sample in the central compartment. A potential difference of 0.5 V cm -1 was applied to the electrobioremediation cells for 60 days. A second cell was used for control and no current was applied to it. The monitoring was carried out by a counting cell and measuring of nalkanes and polyaromatic hydrocarbons using GC mass. The results showed that this technology has good potential to increase the biodegradation of n-alkane hydrocarbons and polyaromatic hydrocarbons such as phenanthrene, 1-3-metilphenanthrene, chrysene, 3-methylchrysene, 6-methylchrysene, benzo(b)fluoranthrene and benzo(ghi)pyrene which, without the application of direct current, were not biodegraded by microorganisms in the soil. The use of salt bridges maintained the pH between values that are compatible with the degrading bacterial community.

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Section: Resultado Y Discusiónunclassified

Electrobioremediation of an unsaturated soil contaminated with hydrocarbon after landfarming treatment

Acuña

Tonin

Pucci

et al. 2010

Port. Electrochim. Acta

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“…Electroosmosis is the movement of water under electric field. Contaminants collected at the electrodes are removed by one or more of the following methods: electroplating, adsorption onto the electrode, precipitation or coprecipitation at the electrode, pumping water near the electrode, or complexing with ionexchange resins (Acar and Alshawabkeh, 1993;Lindgren et al, 1992).…”

Section: Krishna R Reddy • Supraja Chinthamreddy • Ashraf Al-hamdanmentioning

confidence: 99%

Synergistic Effects of Multiple Metal Contaminants on Electrokinetic Remediation of Soils

Reddy

Chinthamreddy

Al-Hamdan

2001

Remediation Journal

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This article presents a bench‐scale study performed to investigate the removal of heavy metals when they exist individually and in combination in soils. Electrokinetic experiments were conducted using two types of clayey soils, kaolin and glacial till. These soils were contaminated with Cr(VI) only, with Ni(II) only, and with Cr(VI), Ni(II), and Cd(II) combined. It was found that in kaolin, a significant pH variation occurred due to electric potential application, affecting the adsorption‐desorption and dissolution‐precipitation, as well as the extent of migration of the contaminants. In glacial till, however, pH changes were not affected significantly. In both kaolin and glacial till, the migration of Cr(VI) and Ni(II) was higher when they were present individually compared to when they existed together with Cd(II). Cr(VI) migration as single or combined contaminant was lower in kaolin as compared to that in glacial till. This result was due to the low pH conditions created near the anode region in kaolin that led to high Cr(VI) adsorption to the clay surfaces. In glacial till, however, nickel precipitated with or without the presence of co‐contaminants due to high pH conditions in the soil. Overall, this study demonstrates that adsorption, precipitation, and reduction are the significant hindering mechanisms for the removal of heavy metals using electrokinetic remediation. The direction of the contaminant migration and overall removal efficiency depend on the polarity of the contaminant, the presence of co‐contaminants, and the type of soil. © 2001 John Wiley & Sons.

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“…This leads to a series of effects: ionic species and charged particles in the soil water migrate to the oppositely charged electrode (electromigration), and along with this migration, a bulk flow of water (electroosmosis) is induced, usually toward the cathode (Lindgren et al, 1992). Once contaminants move toward the electrodes, they may be removed from the soil by several methods, such as adsorption onto the electrode or complexing with ionexchange resins.…”

Section: Electrokinetic Migrationmentioning

confidence: 99%

Methodological considerations for determining cleanup limits for uranium in treated and untreated soils

Layton

Armstrong

1994

Journal of Soil Contamination

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Uranium-contaminated soils are present at various locations across the U.S. where uranium was processed for nuclear fuels or atomic weapons. Important issues in dealing with such contamination include the assessment of the potential health risks associated with human exposures to the residual uranium and the determination of safe levels of U in soils that have been treated by a given technology. This paper reviews pertinent aspects of the health risks posed by uranium in soils and discusses various methodological considerations that must be dealt with in developing cleanup limits for U in treated soils. Of special concern is the development of remediation limits that are closely tied to a set of monitoring requirements for determining compliance with derived limits. Key issues addressed include characterization of the bioavailability of uranium compounds in food and water, determination of a safe level of uranium in kidney tissue, estimation of the health risks associated with the uranium daughter products radium and radon, assessment of the potential for ground-water contamination, biogeochemical characterization of soil-treatment processes, and specification of appropriate monitoring and statistical protocols for analyzing treated and untreated soils.

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Electrokinetic Remediation of Unsaturated Soils

Cited by 14 publications

References 0 publications

Electrobioremediation of an unsaturated soil contaminated with hydrocarbon after landfarming treatment

Electrobioremediation of an unsaturated soil contaminated with hydrocarbon after landfarming treatment

Synergistic Effects of Multiple Metal Contaminants on Electrokinetic Remediation of Soils

Methodological considerations for determining cleanup limits for uranium in treated and untreated soils

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