Evaluation of Electrokinetic Removal of Heavy Metals from Tailing Soils

Kim, Soon-Oh; Kim, Kyoung-Woong; Stüben, Doris

doi:10.1061/(asce)0733-9372(2002)128:8(705)

Cited by 71 publications

(43 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The principle of electrokinetic's operation is to use a direct electric field in soil to direct pollutants in the soil pores toward the electrodes (Wang et al 2009). The major processes of electrokinetic remediation are electromigration and electroosmosis (Kim et al 2002). Electromigration is defined as a directional movement in which ions run toward the electrode with opposite charge (Zhou et al 2004(Zhou et al , 2005.…”

Section: Electrokinetic and Phytoextractionmentioning

confidence: 99%

Chelating Agents and Heavy Metal Phytoextraction

2015

View full text Add to dashboard Cite

Elements with density higher than 5 g cm À3 have been called heavy metals. From the metallic elements that naturally exist, 53 elements belong to the heavy metal group. Some of these heavy metals, such as iron, manganese, copper, zinc, and molybdenum, are known as micronutrients in agriculture, since their amount in soil is low and the little quantity of them is necessary for plant growth. Another group of these elements, such as cobalt and vanadium, has been shown to be useful for plant growth. The other category, such as nickel, chromium, selenium, lead, and cadmium, has toxic effects on plant and other organisms even in low level. The mobility and uptake of these elements and the appearing of their negative effect in the environment depend on soil, water, and plant relations.The term "chelating agents" refers to ligands occupying multiple positions in the inner coordination of a metal ion. Heavy metals combine with one or more reactive groups or ligands like oxygen (-OH, -COO, -POO), nitrogen (-NH 2 , -NH), or sulfur (-SH, -S-S). The result of this phenomenon is the formation of soluble multidentate metal-chelant complexes called "chelates" (Fig. 20.1) which came from a Greek word "chele" meaning the claw of a crab or scorpion (Tsang et al. 2012).To know the increase of metal solubility in soil, it is important to figure out the metal ion-ligand interactions. The complex formation can be considered as equilibrium reaction between the ligand and the metal ion:

show abstract

Section: Electrokinetic and Phytoextractionmentioning

confidence: 99%

Chelating Agents and Heavy Metal Phytoextraction

2015

View full text Add to dashboard Cite

show abstract

“…In this system, hydrogen ions were compensated for by OH -ions provided by the anolyte purging solution, so that the soil surface became negatively charged [14]. The more negatively charged soil surface results in a more negative zeta potential and a greater electroosmotic flow towards the cathode [6,17].…”

Section: Accumulated Electroosmotic Flowmentioning

confidence: 99%

Electrokinetic Removal of Petroleum Hydrocarbon from Residual Clayey Soil Following a Washing Process

Jeon¹,

Yang²,

Kim

et al. 2010

CLEAN Soil Air Water

View full text Add to dashboard Cite

This study investigates total petroleum hydrocarbon (TPH) removal from residual clayey soil, after a washing procedure, using an electrokinetic process. Eight electrokinetic experiments were carried out to investigate the characteristics of TPH removal. When 0.1 M MgSO 4 or 0.1 M NaOH was used as an electrolyte, the electric current rapidly increased within the first 100 or 200 h, respectively. A negatively charged soil surface resulted in a more negative zeta potential and greater electroosmotic flow toward the cathode. Therefore, the accumulated electroosmotic flow (EOF) when using 0.1 M NaOH as the anolyte-purging solution was higher than when using 0.1 M MgSO 4 . Although the energy consumption for the two purging solutions was similar, the efficiencies of TPH removal when 0.1 M MgSO 4 and 0.1 M NaOH with surfactant were used were 0 and 39, respectively, because the electroosmotic flow rate increased with TPH removal efficiency. When 5 isopropyl alcohol (IPA) was used as a circulation solution, the electric current increased but the TPH removal was similar to that using water. In terms of energy consumption, the use of a surfactant-enhanced electrokinetic process with NaOH as electrolyte was effective in removing TPHs from low-permeability soil.

show abstract

“…The electrokinetic (EK) technique, also referred to as "electro-remediation", "electro-reclamation" or "electrochemical remediation", is widely used to separate and extract charged contaminants from soils [4], [5], [6] and other polluted areas [7], [8] and has been shown to successfully decontaminate sludges containing a variety of contaminants [9], [10]. The significance of this technique is its low operational cost and potential applicability to a wide range of contaminant types [11], [12].…”

Section: Résumémentioning

confidence: 99%

Effect of sludge pH and treatment time on the electrokinetic removal of aluminum from water potabilization treatment sludge

Cherifi

Boutemine²,

Laefer

et al. 2016

Comptes Rendus. Chimie

View full text Add to dashboard Cite

Algerian's municipal sewage treatment plants generate around 10 6 m 3 of sewage sludge annually. Recently, rapid expansion of waste water treatment plants without equal attention to the treatment of the produced sludge has generated increasing concerns. While the sludge is usually incinerated or used as an agricultural fertilizer and may contain numerous nutrients, there may also be harmful substances that complicate sludge management. Hence the removal of pollutants from the sludge is necessary before further usage. This paper discusses the characteristics of potable water treatment sludge containing a high aluminum content. Furthermore, an electrokinetic treatment is proposed to remove aluminum from this sludge by varying the type of solution contained in the cathode compartment and modifying the treatment time to optimize the efficiency of the process. Successful results were achieved where 60% of aluminum was collected on the cathode side with a consumed energy around of 1000-2000 kWh kg −1 of sludge weight. RésuméLes stations de traitement d'eaux résiduaires en Algérie génèrent annuellement environ 10 6 m 3 de boues d'épuration. Récemment, on a pu observer une préoccupation croissante quant à la gestion de ces boues d'épuration, en raison des risques pour l'environnement qui ont résulté de l'expansion rapide des stations de traitement des eaux résiduaires, sans qu'on ait apporté une attention égale au traitement des boues produites, qui sont habituellement incinérées ou utilisées comme fertilisants en agriculture. Les boues peuvent contenir un certain nombre de nutriments, mais aussi une infinité de substances nocives qui compliquent la tâche au niveau de la gestion des boues. C'est pourquoi l'élimination de polluants des boues est nécessaire préalablement à leur utilisation. Ce travail expose la caractérisation d'une boue de traitement d'eau potable contenant une grande quantité d'aluminium. En outre, un traitement électrocinétique permettant d'éliminer l'aluminium de cette boue en faisant varier le type de la solution qui conditionne la cathode ainsi que le temps de traitement a été également discuté afin d'optimiser le processus électrocinétique. Des résultats encourageants sont obtenus quant à l'utilisation de cette technique ; jusqu'à 60% de l'aluminium présent initialement dans la boue a été recueilli dans la cathode, pour une énergie consommée d'environ 1000 à 2000 kWh kg −1 de boue sèche.

show abstract

Evaluation of Electrokinetic Removal of Heavy Metals from Tailing Soils

Cited by 71 publications

References 24 publications

Chelating Agents and Heavy Metal Phytoextraction

Chelating Agents and Heavy Metal Phytoextraction

Electrokinetic Removal of Petroleum Hydrocarbon from Residual Clayey Soil Following a Washing Process

Effect of sludge pH and treatment time on the electrokinetic removal of aluminum from water potabilization treatment sludge

Contact Info

Product

Resources

About