Monitoring of electrokinetic removal of heavy metals in tailing-soils using sequential extraction analysis

Kim, Soon-Oh; Kim, Kyoung-Woong

doi:10.1016/s0304-3894(01)00211-4

Cited by 69 publications

(25 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Heavy metals occur in sewage sludge in various forms (Kim et al, 2002). These forms differ in their speciation and mobility, which have a significant impact on the removal efficiency of heavy metals (Kim and Kim, 2001). The values of organic carbon and total nitrogen, as well as the C/N ratio, indicate that this sludge contains high levels of nutrients (Table 2).…”

Section: Sample Characterizationmentioning

confidence: 99%

Electroremediation of heavy metals in sewage sludge

Elicker

Filho

Castagno

2014

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

-This paper presents the application of electrokinetic remediation in the treatment of sludge in a sewage treatment station. The study consisted of, in a first step, the characterization of physicochemical parameters of sludge and, in a second step, the implementation of the electrokinetic remediation technique. The concentrations of Cu, Cr, Pb and Zn in sludge samples, before and after the experiment, were determined by atomic absorption spectroscopy. After 40 hours of experiment, considering an electrolyte flow-rate of 1.34 L.h -1 at a voltage of 20 V, the removal rate of all the metals accompanied was over 50%; the highest removal efficiency was for Pb, with 72.49%. The results show the feasibility of using the electrochemical technique of electrokinetic remediation for metal removal from a sludge sewage treatment station.

show abstract

Section: Sample Characterizationmentioning

confidence: 99%

Electroremediation of heavy metals in sewage sludge

Elicker

Filho

Castagno

2014

Braz. J. Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…However, precipitation of metal hydroxides remained a problem. In addition, Kim and Kim (2001) concluded that the removal efficiency depends on the affinities of the metal ions in the soil. Namely, they found that the efficiencies of mobile ions, such as cadmium, copper, and zinc, were higher than those of less mobile ions, such as lead.…”

Section: Decontamination Of Soilsmentioning

confidence: 99%

Electrokinetic Salt Removal from Porous Building Materials Using Ion Exchange Membranes

2012

View full text Add to dashboard Cite

The removal of salt from porous building materials under the influence of an applied voltage gradient normally results in high pH gradients due to the formation of protons and hydroxyl ions at the electrodes. The formed acidic and alkaline regions not only lead to disintegration of the porous material, but also affect the salt transport. In this work we use ion exchange membranes between the electrodes and the porous material to prevent the protons and hydroxyl ions from intruding into the material. The porous material used in this study is fired clay brick, which has been saturated with a 4 mol/l sodium chloride solution prior to the desalination treatment. In order to experimentally determine the salt removal, we monitored the sodium ion concentration profiles across the material with nuclear magnetic resonance (NMR). In addition, we present theoretical predictions for the salt removal according to a model based on the Poisson-Nernst-Planck theory for ion transport. From the work reported here, we can conclude that the use of ion exchange membranes to desalinate porous building materials is not useful since it reduces the salt removal rate to such an extent that desalination with poultices, which is driven by diffusion only, is more efficient. The reason behind this is twofold. First, the ion exchange membranes provide a penalty for the ions to leave the material. Second, in the absence of acidic and alkaline regions, the salt concentration at the edges of the porous material will reduce to almost zero, which leads to a locally increased electrical resistance, and thus a reduction of the electrical field in the bulk of the material. Due to this reduction the effect of the applied voltage gradient across the material vanishes, and the salt removal is limited by diffusion.

show abstract

“…Experimental results have shown that the application of a direct current field (EK) over tailings can be used to remove Cd, Cu, Pb, and Zn from tailings soils [1,2]; As from tailings [3,4]; and Cu from tailings [5][6][7]. Still, however, a major concern is the long treatment-time required for element-transport through the tailings matrix.…”

Section: Introductionmentioning

confidence: 99%

Suspended electrodialytic extraction of toxic elements for detoxification of three different mine tailings

Jensen¹,

Ottosen²,

Hansen

et al. 2016

Int. J. SDP

View full text Add to dashboard Cite

Environmental effects of mining activities partly origin from the production of tailings, and the exposure of these to ambient physical and chemical conditions. Removal of toxic elements from tailings prior to deposition could improve environmental performance and reduce risks. Experimental results have shown that electrokinetic treatment can remove Cd, Cu, Pb, and Zn from tailings soils; As from tailings; and Cu from tailings. Still, however, a major concern is the long treatment-time required for the element-transport through the tailings matrix. Therefore several enhancement methods have been investigated including pre-treatment of the tailings with acid; insertion of bipolar electrodes; and implementation of pulsed or sinusoidal electric fields. In line with these efforts, we investigated the efficiency when extracting toxic elements from a suspension of tailings, rather than from a solid matrix, which could well be implemented as a final treatment step prior to deposition of tailings. Six electrodialytic experiments in laboratory scale with three different mine tailings (Codelco, Zinkgruvan, and Nalunaq) show that it is possible to extract residual Cu from the all the three suspended mine tailings, although with some difference between the tailings. From the Zinkgruvan sediment, which had the lowest Cu removal, Pb could also be extracted, while Cd and Zn were less extractable.

show abstract

Monitoring of electrokinetic removal of heavy metals in tailing-soils using sequential extraction analysis

Cited by 69 publications

References 17 publications

Electroremediation of heavy metals in sewage sludge

Electroremediation of heavy metals in sewage sludge

Electrokinetic Salt Removal from Porous Building Materials Using Ion Exchange Membranes

Suspended electrodialytic extraction of toxic elements for detoxification of three different mine tailings

Contact Info

Product

Resources

About