Removal of low concentrations of hardness ions from aqueous solutions using electrodeionization process

Fu, Lin; Wang, Jianyou; Yu-long, SU

doi:10.1016/j.seppur.2009.06.010

Cited by 75 publications

(29 citation statements)

References 13 publications

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“…3. It was observed that, the shape of the V-I curve of MFEDI was very similar to that of EDI, demonstrating that the ionic transport and water dissociation phenomena also appeared in the MFEDI process after different current intensities were applied to the resin layer [2,10,24]. Three main regions appeared in the V-I curve, and the corresponding turning points of current density were 50 A/m 2 and 130 A/m 2 , respectively.…”

Section: Voltage-current Relationship Of Mfedimentioning

confidence: 70%

Membrane-free electrodeionization using strong-type resins for high purity water production

Fang

Jiang

et al. 2015

Separation and Purification Technology

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Section: Voltage-current Relationship Of Mfedimentioning

confidence: 70%

Membrane-free electrodeionization using strong-type resins for high purity water production

Fang

Jiang

et al. 2015

Separation and Purification Technology

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“…Theoretically, when the cell voltage is too low, it will be difficult to maintain a desired removal of the ions due to a lower strength of driving force. The increase of applied voltage may improve the quality of the outlet diluate stream 17 . When the applied potential is raised, more potential has been used for the transport of ions, thus the conductivity of water decreased as pointed out in the previous experiments [17][18][19][20] .…”

Section: Effect Of Applied Voltage On Nickel Removalmentioning

confidence: 99%

Study on the influence of applied voltage and feed concentration on the performance of electrodeionization in nickel recovery from electroplating wastewater

Wardani

Hakim

Khoiruddin

et al. 2017

AIP Conference Proceedings

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Solvent extraction separation of nickel and cobalt from a sulfate solution containing iron(II) and magnesium using versatic 10 AIP Conference Proceedings 1805, 030003 (2017) Abstract. Wastewaters from electroplating industries are usually contaminated with nickel up to 1000 mg/L. According to environmental regulations worldwide, nickel concentration on wastewaters must be controlled to an acceptable level before being discharged to the environment. This paper offers an alternative way to develop an efficient effluent-free technology to reduce the nickel content of rinse water so that the treated water could be recycled for rinsing and subsequently to workout methodology to recover nickel by electrodeionization (EDI). Electrical voltage and initial nickel concentration were varied to study the effect of the parameters. Results showed that EDI could remove nickel effectively which gives an outstanding result in terms of product quality. Nickel concentration on diluate chamber decreased up to 99% after 60 and 180 minutes for nickel concentration of 300 and 1000 mg/L, respectively. Meanwhile, the increase of electrical voltage led to faster nickel removal.

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“…The experiments demonstrated that the operation at acidic or neutral pH has obvious effect on the removal of hardness ions. The differences between the removal rates of Ca 2+ and Mg 2+ ions might be attributed to the different ionic sizes and ion mobilities in ion exchange membranes [15]. Also, we measured the pH values of dilute and electrode compartments.…”

Section: Effect Of Phmentioning

confidence: 99%

“…These ions induced scaling problems in installations such as steam boiler can also lead to serious failures. Therefore, removal of these ions from waters has been an area of substantial technological interest in all over the world [15].…”

Section: Introductionmentioning

confidence: 99%

Removal of hardness by electrodialysis using homogeneous and heterogeneous ion exchange membranes

Karabacakoğlu

Tezakıl²,

Güvenç

2014

Desalination and Water Treatment

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A B S T R A C TThe effect of membrane characteristics on removal of hardness ions from its dilute solutions using electrodialysis (ED) system by applying batch recirculation mode has been investigated. Two types of membrane pairs were used. Type I: Ionac MC3470 and MA3475 (Sybron Chem. Co.); Type II: Neosepta CMX and Neosepta AMX (Astom Corp.). These membranes have different ionic permselectivity, electrical resistance and thickness. In the first part of the study, the effects of the feed concentration, dilute flow rate and dilute pH on the hardness removal were investigated using Type I membranes. The optimum values for feed concentration, flow rate and pH were determined as 0.01 M, 2.6 mL/ s and 6.8, respectively. In the second part, the experiments were conducted at different voltage values using Type II membranes under the optimum conditions of these variables obtained. The 95% removal of Mg 2+ with the energy consumption of 2.07 kWh/mol and 93% removal of Ca 2+ with the energy consumption of 2.12 kWh/mol were obtained in 200 min, applying 20 V potential using Type I membranes. On the other hand, the 100% removal of Mg 2+ was achieved by the energy consumption of 1.69 kWh/mol in only 60 min. and the removal of Ca 2+ was 98.3% with the energy consumption of 3.39 kWh/mol in 170 min. applying 20 V and using Type II membranes. The results obtained from this study showed that the membrane characteristics affect the efficiency of the ED significantly.

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Removal of low concentrations of hardness ions from aqueous solutions using electrodeionization process

Cited by 75 publications

References 13 publications

Membrane-free electrodeionization using strong-type resins for high purity water production

Membrane-free electrodeionization using strong-type resins for high purity water production

Study on the influence of applied voltage and feed concentration on the performance of electrodeionization in nickel recovery from electroplating wastewater

Removal of hardness by electrodialysis using homogeneous and heterogeneous ion exchange membranes

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