Ultra-pure water preparation system and method capable of preventing electrodeionization device from scaling

A technology for electrodeionization and preparation systems, applied in chemical instruments and methods, non-polluting water treatment, multi-stage water/sewage treatment, etc., can solve problems such as uneven distribution, increased fresh water inlet pressure, high operating voltage, etc., to reduce Investment and operating costs, simplification of the reverse osmosis process, and the effect of extending the service life

Inactive Publication Date: 2015-12-30
ZHEJIANG GONGSHANG UNIVERSITY
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Problems solved by technology

The design of this countercurrent operation mode requires that the concentrated water cannot be circulated, so the ion concentration in the process of the membrane stack is low, the concentration distribution is very uneven, its resistance is high and the distribution is uneven, the operating voltage is high and the current is biased, which affects desalination Effect and water quality of produced water; and cause the increase of fresh water inlet pressure and increase the energy consumption of water pump operation. Therefore, filling ion exchange resin in the concentrated water chamber improves its electrical conductivity, but this increases the complexity of the structure of th

Method used

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  • Ultra-pure water preparation system and method capable of preventing electrodeionization device from scaling

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Embodiment 1

[0041] Example 1: A microelectronics company uses the electro-deionization process to prepare ultrapure water. The raw water is tap water, which is boosted by a raw water booster pump and transported into a mechanical filter with a flow rate of 4.0m 3 / h, the pressure reaches above 0.3MPa; the water inlet pipe is connected to the metering pump, and ST flocculant is added at a dosage of 0.3-0.8mg / L, and PAC flocculant is added at a dosage of 1.5-3.0mg / L. The diameter of the mechanical filter is 800mm, and it is filled with anthracite and quartz sand filter materials. After filtering to remove suspended solids and colloids in the water, the water enters the activated carbon filter. The activated carbon filter has a diameter of 700mm and is filled with shell-type activated carbon, which is used to absorb organic matter and residual chlorine in water. The water absorbed by the activated carbon filter enters the precision filter to further remove particulate impurities in the water...

Embodiment 2

[0042] Example 2: A pharmaceutical company prepares ultra-pure water by electro-deionization process, and the raw water is also tap water, which is boosted by a raw water booster pump and transported into a mechanical filter with a flow rate of 8.0m 3 / h, the pressure reaches above 0.3MPa. The water inlet pipe is connected to the metering pump, and ST flocculant is added at a dosage of 0.5-1.5mg / L. The diameter of the mechanical filter is 1200mm, and it is filled with anthracite and quartz sand filter materials. After filtering to remove suspended solids and colloids in the water, the water enters the activated carbon filter. The activated carbon filter has a diameter of 1000mm and is filled with shell-type activated carbon, which is used to absorb organic matter and residual chlorine in water. The water absorbed by the activated carbon filter enters the precision filter to further remove particulate impurities in the water. The diameter of the precision filter is 250mm, and ...

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Abstract

The invention provides an ultra-pure water preparation system and method capable of preventing a electrodeionization device from scaling. The preparation system is mainly composed of a raw water pretreatment system, a reverse osmosis system and an electrodeionization system. The raw water pretreatment system comprises a raw water booster pump, a mechanical filter, an active carbon filter and a precision filter, raw water enters the booster pump through a pipeline, and the mechanical filter, the active carbon filter and the precision filter are sequentially connected to the back of the booster pump; the reverse osmosis system comprises a high-pressure pump and a first-grade reverse osmosis device which is composed of a membrane component, a membrane shell, a pipe valve and a control system; the electrodeionization system comprises a fresh water pump, an EDI membrane stack and a rectifier; a water producing tank arranged at the back of the first-grade reverse osmosis device is connected to the membrane stack through the fresh water pump, the rectifier provides an electric field to form a membrane stack electric current, ion exchange resin in the EDI membrane stack continuously removes anions and cations in water through ion exchange, and the ultra-pure water is produced.

Description

technical field [0001] The invention relates to an ultrapure water preparation system and method for preventing fouling of an electrodeionization device, and belongs to the technical field of ultrapure water preparation. Background technique [0002] Electrodeionization device to prepare ultrapure water technology is a membrane separation and desalination process that organically combines electrodialysis technology and ion exchange technology. The device for preparing pure water by electrodeionization is composed of positive electrodes, negative electrodes, cation exchange membranes, concentrated water chambers, anion exchange membranes, and fresh water chambers filled with ion exchange resins located at both ends. , Directional migration and resin regeneration. The electrodeionization device can perform deep desalination of pure water to prepare ultrapure water, without the need for acid-base chemical regeneration, and no regeneration wastewater discharge. It is an environ...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F103/04
Inventor 黄宝能
Owner ZHEJIANG GONGSHANG UNIVERSITY
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