Anti-scaling electrodeionization device in concentrated water distribution design and electrodeionization method

Abstract

The invention relates to an electrodeionization device, and in particular relates to an anti-scaling electrodeionization device in a concentrated water distribution design and an electrodeionization method. The anti-scaling electrodeionization device comprises an electrodeionization device main body component, wherein the electrodeionization device main body component comprises a negative and positive ion exchange membrane, a concentrated water chamber, a fresh water chamber and positive and negative electrodes; and ion exchange resin is filled into the fresh water chamber. The anti-scaling electrodeionization device further comprises a concentrated water shunting distribution structure, wherein the concentrated water shunting distribution structure consists of a concentrated water inlet which is formed in the middle of the outer side surface of the electrodeionization device main body component, concentrated water outlets which are formed in the upper and lower end faces of the concentrated water chamber, and an isolation layer which is arranged in the concentrated water chamber. When the anti-scaling electrodeionization device is operated, negative and positive scaling ions which are transferred from fresh water into the concentrated water are separated from each other to flow through the concentrated water shunting distribution structure, a concentrated water path is shortened, and the time for hardness ions to stay in the component is shortened.

Description

technical field [0001] The invention relates to an electric desalter, in particular to an anti-scaling electric desalter designed for diversion of concentrated water. Background technique [0002] Among the existing water treatment methods for desalination and purification of industrial water, the more advanced method is to combine electrodialysis technology and ion exchange technology to produce ultrapure water, that is, electro-demineralization (EDI). The process of electrostatic desalination is to make the ions contained in the liquid migrate directionally under the action of a direct current electric field and an electroactive medium. to another solution, so as to achieve the membrane separation process for the purpose of desalination. In EDI components, the sequence of extraction for the various ions is different. The first is the extraction of high-priced ions, followed by the extraction of low-priced and easy-to-extract ions, and finally weakly ionized ions, hydroge...

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Problems solved by technology

Although this utility model has the advantages of simple structure, small flow channel resistance, and convenient replacement of ion exchange resin, etc., the structure design of the overall electric desalter makes the concentrated water flow channel too long, Ca 2+ , Mg 2+ ions and CO 3 2- , SO 4 2- The ions stay in the module for a long time, which is easy to form scale; secondly, because the concentrated water inflow passes through the cathode first, the influent water is alkaline, and the tendency of scale formation in the concentrated water is more obvious

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