Method and apparatus for preparing pure water by continuous electricity deionizing

An electrodeionization, pure water technology, applied in separation methods, ion-exchange water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high manufacturing cost, high price, easy scaling, etc. The effect of reducing water and electricity consumption

Inactive Publication Date: 2006-08-02
彭昌盛 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] At present, the EDI equipment produced abroad all adopts homogeneous ion exchange membrane, which has high manufacturing cost and high price.
In addition, EDI equipment is prone to fouling and has extremely strict requirements on the quality of influent water. After a period of use, energy consumption will increase and the quality of effluent water will be unstable.
All of these limit the promotion and use of EDI in our country

Method used

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  • Method and apparatus for preparing pure water by continuous electricity deionizing
  • Method and apparatus for preparing pure water by continuous electricity deionizing
  • Method and apparatus for preparing pure water by continuous electricity deionizing

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Embodiment Construction

[0029] Such as figure 1 As shown, the raw water is prepared from tap water and distilled water in different proportions, and the ion-exchange membrane used is a domestic heterogeneous ion-exchange membrane. Raw water first enters EDI1, and 18V voltage is applied across the electrodes of EDI1 (membrane pair voltage is less than 2V) to perform primary desalination of raw water; the effluent of EDI1’s fresh chamber enters EDI2, and 25V is applied across the electrodes of EDI2 (membrane pair voltage More than 2V) voltage, deep desalination of raw water; EDI2's desalination chamber water enters EDI3, no voltage is applied to both ends of the EDI3 electrode, EDI3's desalination chamber is equivalent to an ion exchange mixed bed, and the residual electrolyte ions in the water are desalted through the ion exchanger Exchange adsorption, so that the effluent of EDI3's desalination chamber reaches the quality of pure water. Most of the effluent from the fresh chamber of EDI3 flows out ...

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Abstract

The invention relates to a process and apparatus for making pure water by consecution electrical deionizing, wherein four same EDI devices are employed, wherein three of them are in series connection for making pure water, the other EDI apparatus is used as the regeneration device of ion exchange agent. According to the invention, the three procedures of ion exchange adsorption, ion directional transfer and electrochemical regeneration are arranged in different EDI devices, thus making them work under optimum status. The EDI devices in the invention can lower the EDI manufacturing cost substantially.

Description

Technical field [0001] The invention relates to a method for preparing pure water, in particular to a method for preparing pure water by continuous electrodeionization technology. Background technique [0002] The pharmaceutical, chemical and semiconductor industries require a large amount of pure water. In the past few decades, the preparation of pure water was mainly by multi-stage distillation and ion exchange. The multi-stage distillation method has high energy consumption and high cost; the ion exchange method requires a large amount of acid and alkali to regenerate the resin, which will cause serious pollution to the environment. [0003] In recent years, a green and environmentally friendly pure water production technology that organically combines electrodialysis and ion exchangers——continuous electrodeionization technology (Electrodeionization, referred to as EDI) has developed rapidly in western developed countries and has been applied in various fields. grows geo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/00B01D61/46C02F1/42C02F1/44C02F1/469C02F1/28C02F103/04C02F9/06
Inventor 孟洪彭昌盛卢寿慈
Owner 彭昌盛
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