Ion Exchange System

DAWT·2022-05-09

Introduction

The ion exchange system is a traditional water treatment process in which various anions and cations in water are replaced by anion and cation exchange resins. Anion bed system and ion exchange mixed bed system, and mixed bed system is usually used to produce ultrapure water and high purity water after reverse osmosis and other water treatment processes. It is used to prepare ultrapure water and high purity water. one of the alternatives. The effluent conductivity can be lower than 0.2μS/cm, and the effluent resistivity can reach more than 5MΩ·cm. According to different water quality and usage requirements, the effluent resistivity can be controlled between 5~18MΩ·cm. It is widely used in the preparation of ultra-pure water and high-purity water for industrial and medical ultra-pure industries such as electronics, ion-exchange resin systems, boiler make-up water, etc.

General process

The first: the deionized water obtained by using cation and anion exchange resin, generally after passing through, the conductivity of the effluent water can be reduced to below 10us/cm, and then it can reach below 0.2μs/cm after passing through the mixed bed. However, the cost of water produced by this method is relatively high, and there are too many particles and impurities, which cannot meet the ideal requirements.

The second: pretreatment (ie sand carbon filter + precision filter) + reverse osmosis + mixed bed process This method is currently the most used, because the investment cost of reverse osmosis is not high, and it can remove more than 90% of the water ions, and the remaining ions are removed by mixed bed exchange, so that the conductivity of the effluent water is about 0.2. This is by far the most popular method.

The third type: two-stage reverse osmosis method is adopted, and the process is as follows:

第四种：前处理与第二种方法一样使用反渗透，只是后面使用的混床采用EDI连续除盐膜块代替，这样就不用酸碱再生树脂，而是用电再生。这就彻底使整个过程无污染了。但这这种方法的前期投资比较多，运行成本低。其流程如下

Next：Softening system

Previous：Mixed bed system

Cooperation

Contact us

Online service

Project Consulting