Application of sequential extraction analysis to electrokinetic remediation of cadmium, nickel and zinc from contaminated soils

Giannis, Apostolos; Pentari, Despina; Wang, Jing‐Yuan; Gidarakos, Evangelos

doi:10.1016/j.jhazmat.2010.08.070

Cited by 80 publications

(36 citation statements)

References 28 publications

(37 reference statements)

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“…Controlling pH throughout the reactor is important because lower pH values favor the desorption of the adsorbed metals on the catalyst (Elicker et al, 2014) and also promote the dissolution of the precipitated contaminants (Giannis et al, 2010).…”

Section: Variations Of Phmentioning

confidence: 99%

Acidic Removal of Metals From Fluidized Catalytic Cracking Catalyst Waste Assisted by Electrokinetic Treatment

Valt

Diógenes

Sanches

et al. 2015

Braz. J. Chem. Eng.

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-One of the main uses of catalysts in the oil industry is in the fluidized catalytic cracking process, which generates large quantities of waste material after use and regeneration cycles and that can be treated by the electrokinetic remediation technique, in which the contaminant metals are transported by migration. In this study, deactivated FCC catalyst was characterized before and after the electrokinetic remediation process to evaluate the amount of metal removed, and assess structural modifications, in order to indicate a possible use as an adsorbent material. The analyses included pH measurement and the concentration profile of vanadium ions along the reactor, X-ray microtomography, X-ray fluorescence, BET analysis and DTA analysis. The results indicated that 40% of the surface area of the material was recovered in relation to the disabled material, showing an increase in the available area for the adsorption. The remediation process removed nearly 31% of the vanadium and 72% of the P 2 O 5 adhering to the surface of the catalyst, without causing structural or thermal stability changes.

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Section: Variations Of Phmentioning

confidence: 99%

Acidic Removal of Metals From Fluidized Catalytic Cracking Catalyst Waste Assisted by Electrokinetic Treatment

Valt

Diógenes

Sanches

et al. 2015

Braz. J. Chem. Eng.

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“…EDTA is the most often used complexing agent, but it is toxic and poorly biodegradable compared to CA (Lestan et al 2008). Other chelatants were tested for EK remediation, such as diethylenetriaminepentaacetic acid, nitrilotriacetic acid, diaminocyclohexanetetraacetic acid or ethylene glycol tetraacetic acid, whose removal efficiencies were not the same according to the metals considered (Giannis et al 2009(Giannis et al , 2010. The combined effect of solubilization of metals and metal-complexes at acidic pH are responsible for the removal capacities of chelatants.…”

Section: Removal Of Metalsmentioning

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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“…Human activities such as transport, fertilization, mining activities and other industrial production often result in a large accumulation of heavy metals in soils [4]. Soil pollution by heavy metals can trigger a series of concerns for environment and public health.…”

Section: Introductionmentioning

confidence: 99%

Medium-scale ex suit electrokinetic remediation of Cd and Zn polluted soil enhanced by EDTA, tartaric acid, citric acid and acetic acid

Liu¹,

Li²,

Wang³

et al. 2017

Proceedings of the 2017 6th International Conference on Energy and Environmental Protection (ICEEP 2017)

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Abstract:The effect of enhancement agents on the efficiency of electrokinetic (EK) remediation of contaminated soils has been extensively studied in the past few years. However, the larger scale ex suit EK remediation with enhancement agents has been rarely reported. In this study, medium-scale EK remediation tests (20 kg dry soil at a single test) enhanced by EDTA, tartaric acid, citric acid and acetic acid were carried out to remove Cd and Zn from the contaminated soil. The removal efficiencies of Cd and Zn were enhanced by EDTA, tartaric acid and citric acid, and the enhanced effect of acetic acid on removal efficiencies of Cd and Zn was less. The highest removal efficiencies of Cd and Zn were 22.2% (citric acid) and 23.3% (tartaric acid), respectively. Low removal efficiencies were ascribed to the accumulations of Cd and Zn in F1 (exchangeable) and F2 (carbonate-associated) fractions in the middle section soils after EK remediation for all tests. After EK remediation, the F3 (reducible) concentrations of Cd and Zn, lower than initial concentrations, increased with the distance from the anode for all tests. The results suggested that F3 fraction can be transformed into F1 and F2 fractions, and F1, F2 and F3 fractions were removable during the EK remediation. Comparing with the control test (CT), more variations of total concentration and speciation of Cd and Zn were found, indicating apparent effects of enhancement agents on heavy metal removal during EK remediation. The results are significant for the enlargement of ex suit EK remediation.

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Application of sequential extraction analysis to electrokinetic remediation of cadmium, nickel and zinc from contaminated soils

Cited by 80 publications

References 28 publications

Acidic Removal of Metals From Fluidized Catalytic Cracking Catalyst Waste Assisted by Electrokinetic Treatment

Acidic Removal of Metals From Fluidized Catalytic Cracking Catalyst Waste Assisted by Electrokinetic Treatment

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

Medium-scale ex suit electrokinetic remediation of Cd and Zn polluted soil enhanced by EDTA, tartaric acid, citric acid and acetic acid

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