Simultaneous removal of organic contaminants and heavy metals from kaolin using an upward electrokinetic soil remediation process

Wang, Jing‐Yuan; Huang, Xiangjun; Kao, Jimmy C.M.; Stabnikova, Оlena

doi:10.1016/j.jhazmat.2006.10.026

Cited by 87 publications

(45 citation statements)

References 27 publications

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“…Hatfield's efforts 134 ͑as embodied in U.S. patent 1,498,911, granted June 1924͒ were directed toward separating minerals, and it is interesting to find that this objective is again being pursued-as for example in the works of Lungu, 135 Batton et al, 136 Wang et al, 137 and Ballantyne and Holtham. 138 Apart from mineral separation, other "industrial" applications of DEP have been examined.…”

Section: B Industrialmentioning

confidence: 99%

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

2010

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A review is presented of the present status of the theory, the developed technology and the current applications of dielectrophoresis ͑DEP͒. Over the past 10 years around 2000 publications have addressed these three aspects, and current trends suggest that the theory and technology have matured sufficiently for most effort to now be directed towards applying DEP to unmet needs in such areas as biosensors, cell therapeutics, drug discovery, medical diagnostics, microfluidics, nanoassembly, and particle filtration. The dipole approximation to describe the DEP force acting on a particle subjected to a nonuniform electric field has evolved to include multipole contributions, the perturbing effects arising from interactions with other cells and boundary surfaces, and the influence of electrical double-layer polarizations that must be considered for nanoparticles. Theoretical modelling of the electric field gradients generated by different electrode designs has also reached an advanced state. Advances in the technology include the development of sophisticated electrode designs, along with the introduction of new materials ͑e.g., silicone polymers, dry film resist͒ and methods for fabricating the electrodes and microfluidics of DEP devices ͑photo and electron beam lithography, laser ablation, thin film techniques, CMOS technology͒. Around three-quarters of the 300 or so scientific publications now being published each year on DEP are directed towards practical applications, and this is matched with an increasing number of patent applications. A summary of the US patents granted since January 2005 is given, along with an outline of the small number of perceived industrial applications ͑e.g., mineral separation, micropolishing, manipulation and dispensing of fluid droplets, manipulation and assembly of micro components͒. The technology has also advanced sufficiently for DEP to be used as a tool to manipulate nanoparticles ͑e.g., carbon nanotubes, nano wires, gold and metal oxide nanoparticles͒ for the fabrication of devices and sensors. Most efforts are now being directed towards biomedical applications, such as the spatial manipulation and selective separation/enrichment of target cells or bacteria, high-throughput molecular screening, biosensors, immunoassays, and the artificial engineering of three-dimensional cell constructs. DEP is able to manipulate and sort cells without the need for biochemical labels or other bioengineered tags, and without contact to any surfaces. This opens up potentially important applications of DEP as a tool to address an unmet need in stem cell research and therapy.

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Section: B Industrialmentioning

confidence: 99%

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

2010

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“…Suitable flushing solutions had to be selected in order to play different roles, in the context where PAHs and metals both existed in our studied aged model sediment: additives allowing to maintain an acidic pH (nitric acid, acetic acid…) or forming soluble complexes with metals (citric acid, EDTA…) proved to be effective for metal removal (Wang et al 2007;Giannis et al 2009;Alcantara et al 2010;Kim et al 2011). Furthermore, maintaining a basic pH (NaOH, n-butylamine…) or using solubilizing compounds such as surfactants (Tween 80, Igepal CA-720, sodium dodecyl sulfate, alkylpolyglucosides…) or cyclodextrins proved to be effective for PAH removal (Reddy et al 2006;Giannis et al 2007;Pazos et al 2010).…”

Section: Resultsmentioning

confidence: 99%

“…To improve the electrokinetic process, it seems necessary not only to enhance PAHs desorption and their solubilization in the aqueous phase, but also to create a favorable environment to transport them towards the electrode compartments (by increasing EOF for example). Wang et al (2007) described other mechanisms than electroosmosis to explain the migration of lipophilic neutral compounds, such as ''uplifting effect'' (transport of nonionic contaminants in an immiscible non-aqueous liquid phase pushed in the same direction as the pore water flow) or dielectrophoresis (movement of an electrical dipole formed in non-uniform electric field). All these phenomena could explain why a proportion of PAHs could be removed from our model sediment using only DW (Table 2).…”

Section: Removal Of Pahsmentioning

confidence: 99%

Simultaneous electrokinetic removal of polycyclic aromatic hydrocarbons and metals from a sediment using mixed enhancing agents

Ammami

Benamar

Wang

et al. 2013

Int. J. Environ. Sci. Technol.

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The maintenance of harbor waterways generates large amounts of dredged sediments which are often rich in coexisting organic and inorganic contaminants. Electrokinetic remediation treatments have recently been developed for the simultaneous removal of heavy metals and polycyclic aromatic hydrocarbons (PAHs), using various enhancing agents generally tested sequentially. In this study, different processing fluids were tested, alone or mixed, to improve the decontamination of aged model sediment contaminated with cadmium, lead, chromium, copper, zinc, and five PAHs. Nitric acid (NA) and citric acid (CA) were tested to avoid the formation of an alkaline front into the sediment and favor the metals removal, while an anionic surfactant [sodium dodecyl sulfate (SDS)] and a nonionic surfactant (Tween 20) were tested to solubilize and mobilize PAHs. Processing fluids were circulated under a constant voltage gradient of 1 V cm -1 for 10-14 days. NA showed an excellent potential to remove metals (76.8-99.9 % removal) and PAHs (70.3-89.7 % removal) in a single run. Besides, the mixture of Tween 20 and CA, more environmental friendly, could be considered as a relatively good processing fluid for the simultaneous removal of metals (10.3-90.8 % removal) and PAHs (53.6-61.6 % removal) from the fine-grained sediment, while SDS mixed to CA was not a good candidate for this purpose (0.1-65 % removal for metals and 34.1-41.0 % removal for PAHs).

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“…Electrodes material and configuration [4][5][6][7][8], use of solubilizing agents e.g. chelating agents, surfactants, cyclodextrins, co-solvents as well as granulometry of the soil/sediment sample [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25], control and effect of operating parameters e.g.…”

Section: Introductionmentioning

confidence: 99%

Performance of electroremediation in real contaminated sediments using a big cell, periodic voltage and innovative surfactants

Hahladakis

Latsos

Gidarakos

2016

Journal of Hazardous Materials

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The present work focused on evaluating the electrokinetic (EK) treatment of real contaminated sediments with toxic metals and polycyclic aromatic hydrocarbons (PAHs), using a big laboratory EK cell, periodic voltage and recently tested non-ionic surfactants. The results indicated that the "day on-night off" application mode of voltage, in conjunction with the selected solubilising agents, favoured the overall EK process. Arsenic, nickel and chromium exhibited the highest removal percentages, obtaining 83%, 67% and 63%, respectively, while zinc and lead attained 54% and 41% at the maximum. Furthermore, in the experiments where the non-ionic surfactants were introduced in the electrolyte chambers, there was a major uniformly removal of PAHs from the entire sediment across the EK cell, indicating the high solubilisation capacity of the enhancing agents. Essentially, transport and in some cases removal of PAHs (particularly from sections adjacent to the electrolyte compartments) also occurred in the unenhanced EK run, mainly due their negative charge, their potential weak bonds to the soil matrix and to the periodic application of voltage. Maximum removal was obtained by the use of Nonidet P40 where app. 1/3 (ca. 6498 g out of 20145 g) of the total initial amount of PAHs were removed from the cell.

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Simultaneous removal of organic contaminants and heavy metals from kaolin using an upward electrokinetic soil remediation process

Cited by 87 publications

References 27 publications

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

Review Article—Dielectrophoresis: Status of the theory, technology, and applications

Simultaneous electrokinetic removal of polycyclic aromatic hydrocarbons and metals from a sediment using mixed enhancing agents

Performance of electroremediation in real contaminated sediments using a big cell, periodic voltage and innovative surfactants

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