Electrokinetic treatment for clayed and sandy soils

Sumbarda-Ramos, E. G.; Guerrero-Gutierrez, O. X.; Murillo-Rivera, B.; González, Ignacio; Guzmán, Mónica

doi:10.1007/s10800-010-0097-7

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…Consequently, different EK phenomena (electromigration, electrophoresis and electroosmosis) occur in the soil when a current is applied, which promotes the transport of ionic and molecular species in the soil, including pollutants, microorganisms or nutrients, and leads to in situ soil remediation. Generally, EK technology is specifically recommended for the treatment of low permeability clay soils [1][2][3][4][5]. In the recent years, interest has increased in combining the advantages of EK technologies with other conventional soil remediation technologies to improve remediation efficiency [6].…”

Section: Introductionmentioning

confidence: 99%

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

et al. 2014

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This paper studies the possibility of providing oxygen to a soil by an electrokinetic technique, so that the method could be used in future aerobic polluted soil bioremediation treatments. The oxygen was generated from the anodic reaction of water electrolysis and transported to the soil in a laboratory-scale electrokinetic cell. Two variables were tested: the soil texture and the voltage gradient. The technique was tested in two artificial soils (clay and sand) and later in a real silty soil, and three voltage gradients were used: 0.0 (control), 0.5, and 1.0 V cm(-1). It was observed that these two variables strongly influenced the results. Oxygen transport into the soil was only available in the silty and sandy soils by oxygen diffusion, obtaining high dissolved oxygen concentrations, between 4 and 9 mg L(-1), useful for possible aerobic biodegradation processes, while transport was not possible in fine-grained soils such as clay. Electro-osmotic flow did not contribute to the transport of oxygen, and an increase in voltage gradients produced higher oxygen transfer rates. However, only a minimum fraction of the electrolytically generated oxygen was efficiently used, and the maximum oxygen transport rate observed, approximately 1.4 mgO2 L(-1)d(-1), was rather low, so this technique could be only tested in slow in-situ biostimulation processes for organics removal from polluted soils.

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Section: Introductionmentioning

confidence: 99%

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

et al. 2014

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“…The characterization of the soil samples included the determination of these physicochemical properties: pH (4), electrical conductivity (4), buffer capacity (5), moisture (4), texture (4), Cation Exchange Capacity (CEC) (6) and Zeta Potential (]) (7).…”

Section: Physicochemical Characterizationmentioning

confidence: 99%

“…The EPA 9081 procedure was followed to determine the Cation Exchange Capacity (CEC) for the natural B and K samples, the homoionic samples and the washed samples. Finally ] it was determine for all the samples, following the reported procedure (7) which consist on the dispersion of 25 mg of sample in 25 mL of deionized water during 30 min on ultrasonic bath. The equipment used for this measurement was the Brookhaven zeta potential/particle size analyzer.…”

Section: Clay-pollutant Interaction Studymentioning

confidence: 99%

Potential Measurements Used to Study the Bentonite-Pollutant and Kaolin-Pollutant Interphase

Ramos¹,

Guzmán²,

Rodríguez³

et al. 2011

ECS Trans.

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To support the application of an electrokinetic treatment to clay soils polluted with metals, a study of the interphase soil-pollutant-soil solution was carried out based on Zeta Potential (ζ) measurements. The physicochemical and transport phenomena that occur during electrokinetic treatment due to the soil-pollutant interaction at different electrolytes can be deduced from the ζ values. The experimental work begins with the physicochemical characterization of two clays: Bentonite (B) and Kaolin (K). Both samples were converted to homoionic form in order to observe the superficial adsorption of cations. 1M solutions of (NH4)2SO4, NH4Cl and CuSO4, CuCl2 were chosen for this purpose. Copper concentration, cation exchange capacity (CEC) and ζ were analyzed in the homoionic samples to study the soil-pollutant interaction. Results show that the adsorption/desorption process can be studied by the ζ values; these values reflect the chemical changes at the soil-pollutant-soil solution interphase.

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“…A concern about electrokinetics is that in the case of clays the electric field can induce changes on the soil matrix structure leading to a reduction in electroosmotic flow, as consequence of the interactions at the interphase soil-electrolyte [3,4].…”

Section: Introductionmentioning

confidence: 99%

Compost Aided Electrokinetic Remediation of an Hydrocarbon Polluted Soil

2017

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An electrokinetic treatment was applied to a weathered hydrocarbon polluted soil compost amended. Results have shown an enhancement in hydrocarbon removal since initial concentration was 18700 mg Kg-1, electroremediated soil ended with 7410 mg-Kg-1, while the compost aided electroremediated soil lowered its concentration to 3250 mg-Kg-1. GC-MS soil analysis evidenced complex molecules at the anode section, while simplest molecules were at the cathode section, in this section survival of Eisenia Andrei worms was higher than 90%.

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Electrokinetic treatment for clayed and sandy soils

Cited by 13 publications

References 10 publications

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

Feasibility of electrokinetic oxygen supply for soil bioremediation purposes

Potential Measurements Used to Study the Bentonite-Pollutant and Kaolin-Pollutant Interphase

Compost Aided Electrokinetic Remediation of an Hydrocarbon Polluted Soil

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