Deionized water equipment process
，是离子交换系统。 Deionized water equipment is an ion exchange system. 、高纯水不可替代的手段之一。 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 and cation exchange resins can be combined in different proportions to form an ion exchange anode bed system. System and ion exchange mixed bed system, and mixed bed system is usually used in the reverse osmosis and other water treatment processes to produce ultra-pure water, high-purity water terminal process, it is used to prepare ultra-pure water , high-purity water is irreplaceable One of the means.
Deionized water equipment process
The first type: deionized water obtained by using an anion exchange resin. Generally, after passing through, the conductivity of the effluent water can be reduced to less than 10us / cm, and then the mixed bed can reach 1us / cm or less. However, the water cost of this method is extremely high, and there are too many particulate impurities, which can not meet the ideal requirements. It has been adopted less frequently.
The second type: pretreatment (that is, sand carbon filter + precision filter) + reverse osmosis + mixed bed process This method is currently the most used because the cost of reverse osmosis investment is not high, and more than 90% of the water can be removed Ions, and the remaining ions are removed by mixed bed exchange, so that the conductivity of the effluent can be about 0.06. This is currently the most popular method.
The third type: the process is as follows:
→ 软化水器→中间水箱→低压泵→精密过滤器→一级反渗透→PH调节→混合器→二级反渗透（ 反渗透膜表面带正电荷）→纯水箱→纯水泵→微孔过滤器→用水点第四种：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。 Tap water → Multi-media filter → Activated carbon filter → Water softener → Intermediate water tank → Low pressure pump → Precision filter → Primary reverse osmosis → PH adjustment → Mixer → Secondary reverse osmosis (the surface of reverse osmosis membrane is positively charged) → Pure water tank → pure water pump → microporous filter → water point fourth: pre-treatment is the same as the second method using reverse osmosis, but the mixed bed used later is replaced by EDI continuous desalination membrane block, so that no acid or alkali is used Resin is regenerated by electricity. This completely makes the whole process pollution-free, and the water quality after treatment can reach: 15M or more. However, this method has a large amount of initial investment and low operating costs.
设备工艺特点 Process characteristics of deionized water equipment
Ion exchange equipment is a traditional deionized water equipment. The quality of its produced water is stable and the cost is relatively low. In the past, the boiler make-up water of the power plant used a positive bed + negative bed + mixed bed treatment process.
With the development of reverse osmosis, EDI and other processes, the operation of ion exchange equipment is complicated, it is not easy to realize automation, acid and alkali are wasted, and the disadvantages of high operating costs are more prominent. It is more used in the deep processing of reverse osmosis.
Small ion exchange equipment often uses plexiglass exchange columns, which is beneficial to observe the resin operation. For example, whether the regeneration layer of the mixed ion exchanger is sufficient, whether the cations are "poisoned", etc., and the resin loss.
Large-scale ion exchange equipment uses carbon steel lining epoxy resin or rubber lining, and a visual device is reserved in the middle to facilitate the online observation of the regeneration liquid level during ion regeneration.