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

Hu, Jian; Fang, Zhixing; Jiang, Xiaping; Li, Tianjun; Chen, Xueming

doi:10.1016/j.seppur.2015.02.023

Cited by 24 publications

(7 citation statements)

References 28 publications

(61 reference statements)

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“…As shown in Figure 3a, the shape of the voltagecurrent (V-I) curve of ERMI was very similar to that of MFEDI and EDI. 26 Three main regions appeared in this curve, namely, high resistance region (Region I), transition region (Region II), and low resistance region (Region III), and the corresponding turning points were 15 and 90 A/m 2 , respectively. The main difference in electric characteristics between ERMI and MFEDI is that the voltage required in ERMI was very low.…”

Section: Electric Characteristics Of Ermimentioning

confidence: 91%

“…At the same time, direct current is supplied. Its regeneration mechanism is similar to that of electrodeionization (EDI) 26 . At a certain current density, the electrolysis reaction and water split produce a large amount of H + and OH − which can be exchanged with salt ions in the resin phase.…”

Section: Introductionmentioning

confidence: 95%

“…The original electrical regeneration equipment has complex structure. 22 In recent years, Chen's group [23][24][25][26][27][28][29][30] has proposed a process with a simple structure named as membrane-free electrodeionization (MFEDI). Compared with the traditional ion exchange column, only a pair of circular electrodes installed at the upper and lower ends of the resin bed was added in the MFEDI ion exchange column.…”

Section: Introductionmentioning

confidence: 99%

“…Its regeneration mechanism is similar to that of electrodeionization (EDI). 26 At a certain current density, the electrolysis reaction and water split produce a large amount of H + and OH − which can be exchanged with salt ions in the resin phase. Salt ions enter the aqueous phase from the resin phase, then leave the resin bed under the water flow and electric field.…”

Section: Introductionmentioning

confidence: 99%

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Low‐voltage and ion‐free‐reverse‐migration electrically regenerated mixed‐bed ion exchange for MEG desalination

Zhang

Yang

et al. 2020

Asia-Pacific J Chem Eng

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An improved electrical regeneration method of ion exchange was proposed to enhance the feasibility of applying ion exchange for mono-ethylene glycol (MEG) desalination and simplify the existing MEG regeneration process in deepwater gas fields. Compared with the latest electrical regeneration process named membrane-free electrodeionization (MFEDI), this method required lower voltage, did not consume high purity water, and eliminated ion backward migration in principle. These improvements were achieved by changing the electric field direction and the flow direction from parallel in MFEDI to perpendicular during ion exchange regeneration step. In this work, a pair of commercial ruthenium oxide-coated titanium electrodes was installed on both sides of the cuboid experimental setup. The mixed resins consisting of strong-base and weak-acid resins were filled between the electrodes. In water flow and direct current electric field, the resins were regenerated successfully. The feasibility of efficient regeneration with high conductivity feed water (3-200 μS/cm) was verified. After regeneration of the resin bed for 1 h at a voltage lower than 73 V, 33.83% of NaCl in 5.16 bed volume (BV) simulated rich MEG liquid was removed. After 15 cycles of repeated operation, the performance of the resins remained stable. These results provide the possibility to reclaim MEG in deepwater gas fields through a simpler method.

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Section: Electric Characteristics Of Ermimentioning

confidence: 91%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Low‐voltage and ion‐free‐reverse‐migration electrically regenerated mixed‐bed ion exchange for MEG desalination

Zhang

Yang

et al. 2020

Asia-Pacific J Chem Eng

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“…However, these technologies have drawbacks. The advantages of electrochemical water softening technology includes simple maintenance, environmental protection, and convenient process control (Hu et al 2015;Sanjuán et al 2019a). The electrochemical water softening technique produces OH À ions by electrolytic reaction, which are enriched near the cathode to form a highly alkaline region, and promotes the formation of calcium carbonate crystals on the cathode surface (Zhang et al 2015;Sanjuán et al 2019b).…”

Section: Introductionmentioning

confidence: 99%

Research on performance optimization and mechanism of electrochemical water softening applied by pulse power supply

Wang

et al. 2021

Water Science and Technology

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In order to promote the application of electrochemical water softening technology in industrial circulating cooling water systems, electric field type, cathode structure and solution residence time are selected for optimization analysis of electrochemical water softening device. The experimental results show that the water softening performance per unit area of mesh cathode is better than that of plate cathode. In addition, the softening amount per unit area of the mesh cathode can be further increased when the high-frequency (HF) power supply is applied. When the HF power supply is applied, the softening amount per unit area is 158.58 g/m2·h−1 more than that the direct current power supply is applied. In order to explore the growth mechanism of calcium carbonate, micro-analysis technology and high-speed bubble photography technology are used. The results show that the bubbles escape along the longitudinal direction of the electrode plate, and the main growth direction of calcium carbonate growth is consistent with the escape direction of the bubble, that is, the bubbles grow along the longitudinal direction of the electrode plate. The special structure of the diamond-shaped mesh cathode facilitates the growth of calcium carbonate crystals.

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Configuration and mechanism of electrodeionization module

Kumar,

Rathi

2024

Electrodeionization

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

Cited by 24 publications

References 28 publications

Low‐voltage and ion‐free‐reverse‐migration electrically regenerated mixed‐bed ion exchange for MEG desalination

Low‐voltage and ion‐free‐reverse‐migration electrically regenerated mixed‐bed ion exchange for MEG desalination

Research on performance optimization and mechanism of electrochemical water softening applied by pulse power supply

Configuration and mechanism of electrodeionization module

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