Membrane-less electrodeionization-based water softening device and water softening method therefor

A hard water softening and electrodeionization technology, which is applied in separation methods, ion exchange water/sewage treatment, general water supply saving, etc., can solve the problem that the amount of treated water cannot be enlarged indefinitely, so as to improve resource utilization, increase the application range, The effect of expanding the flow range

Active Publication Date: 2012-06-13
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, none of the above devices can infinitely amplify the amount of treated water

Method used

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  • Membrane-less electrodeionization-based water softening device and water softening method therefor
  • Membrane-less electrodeionization-based water softening device and water softening method therefor
  • Membrane-less electrodeionization-based water softening device and water softening method therefor

Examples

Experimental program
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Embodiment 1

[0029] use figure 1 Shown is a membraneless electrodeionization hard water softening device. The anode is a titanium ruthenium-plated mesh electrode, and the cathode is a stainless steel mesh electrode; the anion and cation exchange resins are D201 macroporous strong basic styrene-based hydrogen-oxygen resin and D001 macroporous styrene-based hydrogen-type resin; the size of the pool 0.05432m 3 (1.94*0.2*0.14), the thickness of the resin wall is 0.07m. The NaCl content in the raw water is about 10mg / L. First, the raw water is diverted by the three-way valve, and the main line enters the first fresh water tank, and then flows out through the second fresh water tank. The auxiliary line water enters the concentrated water tank; before the power is turned on, the conductivity of the effluent water is close to the conductivity of the raw water; then 30V voltage is applied to both sides of the device to perform electrodeionization treatment on the raw water; after 48 hours of cont...

Embodiment 2

[0031] In Example 2, a membraneless electrodeionization hard water softening device is used to soften boiler water. The deionization device, principle, and operation steps in Example 2 are the same as in Example 1; the raw water is tap water, and the total hardness is 232mg / L (calculated as calcium carbonate); 30V is applied to both ends of the electrodes of the device, and after a week of stable and continuous operation , the total hardness of the effluent is less than 2mg / L (calculated as calcium carbonate), according to the provisions of the national standard GB / T 1576-2008, natural circulation steam boilers, using water outside the boiler, the hardness should be ≤ 3mg / L (calculated as calcium carbonate ).

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Abstract

The invention discloses a membrane-less electrodeionization-based water softening device and a water softening method therefor. The membrane-less electrodeionization-based water softening device comprises anode chambers, first water desalination tanks, concentrated water tanks, second water desalination tanks and cathode chambers. Each adjacent two of the anode chambers, the first water desalination tanks, the concentrated water tanks, the second water desalination tanks and the cathode chambers are separated by an anion selective-exchange wall or a cation selective-exchange wall. The water softening method for the membrane-less electrodeionization-based water softening device comprises the following steps that voltage is applied to two ends of the membrane-less electrodeionization-based water softening device; and water needed to be softened passes through the first water desalination tank and then passes through the second water desalination tank to form purified product water. Through electromigration action, anions or cations respectively move to the anion selective-exchange wall or the cation selective-exchange wall, are adsorbed and permeate into the concentrated water tank,wherein a concentrated solution in the concentrated water tank can recover the cations and the anions. The membrane-less electrodeionization-based water softening device can realize softening of boiler feed water, preparation of purified water, desalination of sea water and extraction of mineral substances of underground mineral water, and can be utilized for treatment on industrial sewage and recovery of useful ions of the industrial sewage.

Description

technical field [0001] The invention relates to a membraneless electrodeionization hard water softening device and a method thereof. Background technique [0002] Compared with ordinary electrodialysis (ED), the ion exchange resin filled in the dilute chamber of electrodeionization (EDI) greatly improves the conductivity between the membranes, strengthens the ion migration from the solution to the membrane surface, and destroys the diffusion layer of the membrane surface. In the "ion-poor" state, the limiting current density and current efficiency are significantly improved. In addition, when the desalination chamber is filled with ion exchange resin, the liquid flow velocity in the desalination chamber is much larger than that in the ordinary ED device, and the resin acts as agitator to promote ion diffusion, improve the hydraulic state, and make the desalination chamber system As the conductivity increases, the limiting current density increases accordingly. Therefore, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F1/42
CPCY02A20/124
Inventor 吴祖成廖文任琼
Owner ZHEJIANG UNIV
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