Electrodeionization water-purifying device and method for recovering cation and anion without scaling

An anion and cation, electrodeionization technology, applied in separation methods, ion exchange water/sewage treatment, dispersed particle separation, etc., can solve the problem of increasing the inhomogeneity of the internal resistance of the membrane stack, the non-recyclable use of polar water and concentrated water, Problems such as secondary pollution of resin acid-base regeneration, to achieve the effect of improving resource utilization, reducing energy consumption, and reducing costs

Active Publication Date: 2007-08-01
吴祖成
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Raw water is pre-softened with cathodic resin and connected in series to make the device complex and increase the cost, and the acid-base regeneration of the resin is easy to cause secondary pollution
Countercurrent operation and special concentrated chamber structure design require that the polar water and concentrated water cannot be recycled, and it is necessary to continuously inject saline solution into the polar chamber and concentrated chamber feed water to maintain its conductivity, resulting in a very large consumption of water and chemicals , in addition, the distribution of ions in the whole process is very uneven, which increases the inhomogeneity of the internal resistance of the membrane stack. For the long-term stable operation of EDI, its practicality needs to be tested in practice

Method used

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  • Electrodeionization water-purifying device and method for recovering cation and anion without scaling

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Embodiment 1

[0026] The five-compartment electrodeionization device shown in Figure 1 is used to produce pure water, and the process flow is shown in Figure 2. The anode is a titanium mesh electrode coated with ruthenium, and the cathode is a stainless steel mesh electrode. The anion and cation exchange resins are respectively D201 macroporous strongly basic styrene-based anion resin and D001 macroporous strongly acidic styrene-based cation resin. The cation resin is hydrogen type and the anion resin is hydroxide type. Anion and cation exchange membranes are domestic DF120 homogeneous anion exchange membrane and DF120 homogeneous cation exchange membrane respectively. The effective area of ​​membrane and electrode is 150cm 2 , Membrane distance 0.8cm, electrode chamber thickness 1.6cm, the first dilute chamber and the second dilute chamber are filled with about 120ml of cationic and anion exchange resins respectively. Raw water is tap water after mechanical filtration. First, a small am...

Embodiment 2

[0028] The anion and cation exchange membranes in Example 2 are domestic heterogeneous anion and cation exchange membranes; the effective area of ​​the membrane and the electrodes is expanded to 900cm 2 ; The first light chamber and the second light chamber are filled with about 720ml of cation and anion exchange resins respectively; the raw water is the plated parts cleaning water discharged from the nickel plating production line of the electroplating plant, which contains Ni 2+ About 50mg / L, SO 4 2- About 82mg / L, pH value about 6; 60V voltage is applied to both ends of the device electrodes; the rest of the device parts and water purification process are the same as in Example 1. Under the above operating conditions, the electrodeionization device operates continuously and stably for 240 hours, and the raw water treatment capacity is 1.5m 3 / h, Ni in fresh water 2+ Concentration lower than 0.05mg / L, Ni in concentrated water 2+ The amount can reach 4200mg / L, the current ...

Embodiment 3

[0030] The device, water purification process and operation steps of Example 3 are the same as those of Example 1, and the difference from Example 1 is that: Example 3 uses domestic heterogeneous anion and cation exchange membranes; the raw water is NO-containing 3 - 70mg / L, PO 4 3- 30mg / L water; extreme water is 25mg / L NaNO 3 solution; the concentrated water is recycled as fertilizer; the updated anode and anode water are discharged and mixed with raw water for reuse. The water inlet flow rate of the control device is 200L / h, and the resulting NO in the outlet water 3 - Concentration lower than 0.3mg / L, PO 4 3- The concentration is lower than 0.06mg / L.

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Abstract

The invention discloses an electric ion-removing water purifying device and method without scaling to recycle anion and cation, which comprises the following parts: anode chamber with anode, first dilute and first condense chambers with cation exchange resin, second dilute chamber with anion exchange resin, anode chamber with anode, wherein two side of first dilute chamber is separated by two cation exchange films, which separates anode chamber and condense chamber separately; two sides of the second dilute chamber is divided by two anion exchange films, which separates condense chamber from cathode chamber; the pressure is added between anode and cathode to circulate anode water, cathode water and condense water periodically; the original water flows through the first and second dilute chambers, which produces pure water.

Description

technical field [0001] The invention relates to an electric deionization water purification device and method that has no scaling and recovers anions and cations. Background technique [0002] Electrodeionization (EDI for short) was also called packed bed electrodialysis in the early days. It is an organic combination of electrodialysis and ion exchange. Ion exchange resin is filled between the ion exchange membranes in the fresh water chamber of the electrodialysis device. A new type of separation technology that realizes deionization operation under the action of field. It is capable of deep desalination of low-concentration solutions without chemical acid-base regeneration. In recent years, EDI has developed very rapidly, and has been used in the preparation of pure water and high-purity water in many industrial fields such as medicine, electric power, electronics, and food, and has also begun preliminary applications in electroplating and other industries. [0003] How...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/42
Inventor 吴祖成冯霄陈雪芬
Owner 吴祖成
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