Ion and ionic current sinks for electrodeionization of simulated cadmium plating rinse waters

Dermentzis, Konstantinos; Christoforidis, A.; Papadopoulou, Despina; Davidis, A. E.

doi:10.1002/ep.10438

Cited by 22 publications

(8 citation statements)

References 22 publications

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“…Several treatment processes have been suggested for the removal of nickel ions from aqueous waste streams: adsorption [2,3], biosorption [4,5], ion exchange [6], chemical precipitation [7,8] and electrochemical methods: electrowinning [9.10], electrodialysis [11], electrodeionization [12,13], membrane-less electrostatic shielding based electrodialysis/electrodeionization [14][15][16] and electrocoagulation.…”

Section: Introductionmentioning

confidence: 99%

Nickel removal from waste water by electrocoagulation with aluminum electrodes

Dermentzis¹,

Valsamidou²,

Lazaridou³

et al. 2011

JESTR

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In this study, the performance of electrocoagulation with aluminium electrodes for removing nickel from synthetic aqueous solutions and actual electroplating wastewater was investigated. Parameters affecting the electrocoagulation process, such as initial pH, current density, initial metal ion concentration and contact time were investigated. The removal efficiency is very high in the pH range 4-10. Increased current density accelerated the electrocoagulation process, however, on cost of increased energy consumption. Initial Ni 2+ concentrations of 100-300 mg/lit were quantitatively reduced under the admissible limits in only 10-20 minutes of electrolysis time respectively at the current density of 30 mA/cm 2 . The process has proved to be efficient in removing Ni 2+ ions also from industrial electroplating effluents, where an initial Ni 2+ concentration of 215 mg/lit fell under the legal limits in 20 minutes.

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Section: Introductionmentioning

confidence: 99%

Nickel removal from waste water by electrocoagulation with aluminum electrodes

Dermentzis¹,

Valsamidou²,

Lazaridou³

et al. 2011

JESTR

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“…The performance of the EDI in terms of the mass transfer coefficient ( k ) and flux ( j ), current efficiency (CE; %), and the specific power consumption (SPC) for Li + transport is calculated using the corresponding formulas ,− given in the following equations (eqs –), and results are summarized in Table . J = ( C i − C f ) Q n A k = false( C i .25em − .25em C f false) C i Q n A normalS normalP normalC .25em ( W h g ) = E ∫ 0 t I .25em normald t ( C i − C f ) M .25em V normalD normalC normalE .25em ( % ) = z…”

Section: Resultsmentioning

confidence: 99%

Utilization of Electrodeionization for Lithium Removal

2023

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In this work, usage of a hybrid polymeric ion exchange resin and a polymeric ion exchange membrane in the same unit to remove Li + from aqueous solutions was reported. The effects of the applied potential difference to the electrodes, the flow rate of the Li-containing solution, the presence of coexisting ions (Na + , K + , Ca 2+ , Ba 2+ , and Mg 2+ ), and the influence of the electrolyte concentration in the anode and cathode chambers on Li + removal were investigated. At 20 V, 99% of Li + was removed from the Li-containing solution. In addition, a decrease in the flow rate of the Licontaining solution from 2 to 1 L/h resulted in a decrease in the removal rate from 99 to 94%. Similar results were obtained when the concentration of Na 2 SO 4 was decreased from 0.01 to 0.005 M. The selectivity test showed that the simultaneous presence of monovalent ions such as Na + and K + did not change the removal rate of Li + . However, the presence of divalent ions, Ca 2+ , Mg 2+ , and Ba 2+ , reduced the removal rate of Li + . Under optimal conditions, the mass transport coefficient of Li + was found as 5.39 × 10 −4 m/s, and the specific energy consumption was found as 106.2 W h/g LiCl. Electrodeionization provided stable performance in terms of the removal rate and transport of Li + from the central compartment to the cathode compartment.

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“…In our previous works (Dermentzis 2008;Dermentzis et al 2010) we have shown that electrostatic shielding electrodialysis/electrodeionization can be realized by means of electrostatic shielding zones-ionic current sinks ESZs-ICSs instead of permselective ion exchange membranes.…”

Section: Introductionmentioning

confidence: 99%

An electrostatic shielding-based coupled electrodialysis/electrodeionization process for removal of cobalt ions from aqueous solutions

Dermentzis

Davidis

Dermentzi

et al. 2010

Water Science and Technology

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Electrode graphite powder beds were interposed between anode and cathode as intermediate electrodes inside an electrolytic setup. Due to electrostatic shielding they eliminate the applied electric field and therefore stop the electromigration of ions within their mass. It was found that the intermediate electrodes can act as ionic current sinks-ion concentrating compartments and therefore cause a new type of a membrane-less electrodialysis/electrodeionization process. The proposed electrostatic shielding based coupled electrodialysis/electrodeionization treatment of synthetic cobalt plating rinse water containing 300 mg L(-1) Co(2 + ) ions produced a low-volume Co(2 + ) concentrate which could be recycled to the electroplating bath for reuse and a diluate containing 43.8 mg L(-1) Co(2 + ) ions. The diluate was then used as feed in the subsequent electrostatic shielding electrodeionization process which produced pure water with a cobalt ion concentration less than 0.1 mg L(-1). The current efficiency was 22-29%, the enrichment factor 13.5-26.1, the current density 20-40 A m(-2) and the flow rate 1.54 × 10(-4)-4.06 × 10(-4) dm(3) s(-1). The proposed membrane free electrostatic shielding electrodialysis/electrodeionization process could be developed into a new alternative electrochemical method of cobalt or other heavy metal removal and water purification and recycling from industrial effluents laden with heavy metals.

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Ion and ionic current sinks for electrodeionization of simulated cadmium plating rinse waters

Cited by 22 publications

References 22 publications

Nickel removal from waste water by electrocoagulation with aluminum electrodes

Nickel removal from waste water by electrocoagulation with aluminum electrodes

Utilization of Electrodeionization for Lithium Removal

An electrostatic shielding-based coupled electrodialysis/electrodeionization process for removal of cobalt ions from aqueous solutions

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