Electrokinetic Modeling of Heavy Metals

Rodríguez‐Maroto, José Miguel; Vereda‐Alonso, Carlos

doi:10.1002/9780470523650.ch25

Cited by 3 publications

(1 citation statement)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Models for reactive transport in porous media based on chemical equilibrium assume that the rates of reversible chemical reactions are faster (in both the forward and the backward directions) than the rates of the transport phenomena involved in the process, namely: diffusion, electromigration and electroosmosis [1]. This approach is frequently denoted as the assumption of local chemical equilibrium (LCE) [2], and it has been demonstrated as a suitable approach in many cases [3][4][5][6][7][8][9][10]. However, simulation results often displayed some disagreement with the experimental data in terms of concentration profiles with excessively sharp gradients compared to those obtained experimentally [7,[11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Modeling of electrokinetic remediation combining local chemical equilibrium and chemical reaction kinetics

Masi

Paz‐Garcia

Gómez-Lahoz

et al. 2019

Journal of Hazardous Materials

View full text Add to dashboard Cite

A mathematical model for reactive-transport processes in porous media is presented. The modeled system includes diffusion, electromigration and electroosmosis as the most relevant transport mechanism and water electrolysis at the electrodes, aqueous species complexation, precipitation and dissolution as the chemical reactions taken place during the treatment time. The model is based on the local chemical equilibrium for most of the reversible chemical reactions occurring in the process. As a novel enhancement of previous models, the local chemical equilibrium reactive-transport model is combined with the solution of the transient equations for the kinetics of those chemical reactions that have representative rates in the same order than the transport mechanisms. The model is validated by comparison of simulation and experimental results for an acidenhanced electrokinetic treatment of a real Pb-contaminated calcareous soil. The kinetics of the main pH buffering process, the calcite dissolution, was defined by a simplified empirical kinetic law. Results show that the evaluation of kinetic rate entails a significant improvement of the model prediction capability.

show abstract

Section: Introductionmentioning

confidence: 99%

Modeling of electrokinetic remediation combining local chemical equilibrium and chemical reaction kinetics

Masi

Paz‐Garcia

Gómez-Lahoz

et al. 2019

Journal of Hazardous Materials

View full text Add to dashboard Cite

show abstract

A Coupled Reactive-Transport Model for Electrokinetic Remediation

Paz‐Garcia

Villén-Guzmán

García-Rubio

et al. 2016

Electrokinetics Across Disciplines and Continents

View full text Add to dashboard Cite

Critical Review of Electro-kinetic Remediation of Contaminated Soils and Sediments: Mechanisms, Performances and Technologies

Han

et al. 2021

Water Air Soil Pollut

View full text Add to dashboard Cite

Remediation of contaminated soil and sediment is important for improving the eco-environmental quality. Electro-kinetic remediation (EKR) is an environmentally friendly technology to migrate and remove pollutants from the soil and sediment matrix. This paper analyses the mechanism and performance of EKR of heavy metals, organic pollutants, and compound pollutants. Moreover, the effect of optimizing individual EKR through soil and sediment pre-treatment (adding acid/oxidant/co-solvent/surfactant, stirring, heating, etc.), electrode optimization (exchange electrode, anode approximation, electrode matrix, etc.), and applying multi-technology combination (electro-kinetic permeable reaction barrier/Fenton/ion, exchange membrane/ultrasonic/electrolyte enhancement, etc.) was evaluated. Factors including incomplete separation of pollutants, variation in physico-chemical properties and microstructure of soil/sediment, and difficulties in in situ practice have restrained the field application of EKR. To solve the above technical challenge, an integrated EKR technology based on pollutant in situ separation, followed by separated contaminant treatment, and subsequent valuable elements recovery is proposed.

show abstract

Electrokinetic Modeling of Heavy Metals

Cited by 3 publications

References 20 publications

Modeling of electrokinetic remediation combining local chemical equilibrium and chemical reaction kinetics

Modeling of electrokinetic remediation combining local chemical equilibrium and chemical reaction kinetics

A Coupled Reactive-Transport Model for Electrokinetic Remediation

Critical Review of Electro-kinetic Remediation of Contaminated Soils and Sediments: Mechanisms, Performances and Technologies

Contact Info

Product

Resources

About