Untitled

Kim, Soon-Oh; Moon, Seung‐Hyeon; Kim, Kyoung-Woong

doi:10.1023/a:1005283001877

Cited by 107 publications

(23 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For validation of the numerical model, we used the EKR test reported by [21] for the removal of cadmium ions from water-saturated kaolinite. Figure 1 illustrates a schematic of the EKR batch system.…”

Section: Experimental Datamentioning

confidence: 99%

“…Figure 1 illustrates a schematic of the EKR batch system. The experimental study which was carried out by [21] is the kaolinite soil that was artificially contaminated by Cd(NO3)2 solution. The experimental apparatus consists of four main parts; soil cell, electrode cells, anode and cathode electrolyte solution reservoirs and power supply.…”

Section: Experimental Datamentioning

confidence: 99%

“…We considered the tortuosity factor equal 0.15 and retardation factor equal to 7 according to sensitivity analysis and we used characteristics from Table 3 in our simulation. Applied electric field (V) 17 [21] At each time step chemical reactions should be solved to find equilibrium value of each chemical species concentration. At first step transport equations are solved according to initial conditions by finite difference method to find concentrations at the next time step, then water chemical equilibrium, precipitation, and pH-dependent adsorption isotherm model are solved to find species equilibrium concentration and these concentrations go to transport equation to find species concentration at the new time step.…”

Section: Finite Difference Implementation and Model Proceduresmentioning

confidence: 99%

See 2 more Smart Citations

Mathematical Modeling and Sensitivity Analysis on Cadmium Transport in Kaolinite under Direct Current Electric Field

2017

View full text Add to dashboard Cite

Soil pollution is a challenging concern for environmentalists. Different remediation methods have been proposed to remediate polluted soils. Most of the existing methods cannot purify low permeable soils. Electrokinetic remediation (EKR) is an effective method which can remediate fine-grained soils. Understanding the physicochemical phenomena of the EKR is necessary to achieve efficient experimental framework. Therefore, the present study aims to introduce a theoretical and mathematical model for the EKR process. In the present model, different transport phenomena including ion migration, electroosmotic flow, and diffusion were considered. In addition, Chemical reactions such as adsorption/desorption, precipitation/dissolution, water autoionization reaction, and electrolysis reaction were considered. For modeling purpose, a set of partial differential and algebraic equations were used to model the remediation process. The implicit finite difference numerical model showed a good capability of simulating the EKR process. The sensitivity analysis on the retardation and tortuosity factors represented that the retardation factor had a considerable effect on the pH and cadmium concentration profiles. Although tortuosity factor did not have a significant impact on the pH profile, it had a non-negligible effect on the cadmium concentration profile.

show abstract

Section: Experimental Datamentioning

confidence: 99%

Section: Experimental Datamentioning

confidence: 99%

Section: Finite Difference Implementation and Model Proceduresmentioning

confidence: 99%

See 1 more Smart Citation

Mathematical Modeling and Sensitivity Analysis on Cadmium Transport in Kaolinite under Direct Current Electric Field

2017

View full text Add to dashboard Cite

show abstract

“…The magnitude of the transport velocity due to an electro-migration and electro-osmosis is directly related to the electric potential gradient. Recently, researchers have been investigating whether this method can be used to remove subsurface contaminants and they have published their research results on the use of electrokinetic techniques to decontaminate fine-grained soils, and discussed some of the problems that occurred during this process [9][10][11]. An equation for an electrokinetic process is as follows.…”

Section: Introductionmentioning

confidence: 99%

Decontamination of radioactive concrete using electrokinetic technology

2010

View full text Add to dashboard Cite

The experimental results of the electrokinetic decontamination with 0.01 M of nitric acid were that the cesium ions were removed by up to 52% from the concrete after 15 days, also the cobalt ions were only removed by up to 0.7%. The concrete should be washed with H 2 SO 4 as a pretreatment before electrokintic decontamination to lower its pH below 4.0. The removal efficiencies of 60 Co and 137 Cs by nitric acid were increased by 3.1 and 2.5% more than those by acetic acid. The larger the particle size of the concrete, the more the removal efficiencies of 60 Co and 137 Cs were increased. Also, the removal efficiencies of 60 Co and 137 Cs by the application of an electric current of 20 mA/cm 2 were increased by 1.6 and 3.9% more than those by the application of 10 mA/cm 2 . The removal efficiencies of 60 Co and 137 Cs from the radioactive concrete of 1,940 Bq/kg were 99.8 and 92.3% by electrokinetic decontamination after pretreatment by the application of an electric current of 20 mA/cm 2 for 25 days.

show abstract

“…The main principle of electrokinetic is the application of an electric field that promotes the displacement of pollutants agents through the soil solution. Three transport phenomena named: electroosmosis (water movement), electromigration (ion movement) and electrophoresis (colloidal movement) are occurring in an electrokinetic treatment [1]. On the other hand, there are several factors determining the extractability of pollutants when electrokinetic treatment is applied, these are: pollutants type and concentration, soil type, soil solution pH, soil buffer capacity, soil zeta potential, electroosmotic flow, operation parameters (electrodes, cell voltage and current) and addition of surfactants agents increasing removal efficiency [2].…”

Section: Introductionmentioning

confidence: 99%