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The principle of ion exchange pure water treatment equipment

2023/03/22

Ion exchange pure water treatment equipment is a traditional water treatment process that replaces various anions and cations in water through anion and cation exchange resins. The anion and cation exchange resins are matched in different proportions to form an ion exchange bed system. Exchange shade bed system and ion exchange mixed bed (complex bed) system, and mixed bed (complex bed) system is usually used after reverse osmosis and other water treatment processes to produce ultra-pure water, high-purity water terminal process, he is One of the irreplaceable means currently used to prepare ultra-pure water and high-purity water. The conductivity of the outlet water can be lower than 1uS/cm, and the resistivity of the outlet water can reach more than 1MΩ.cm. According to different water quality and use requirements, the outlet water resistivity can be controlled between 1~18MΩ.cm. It is widely used in the preparation of industrial ultrapure water and high-purity water such as ultrapure water for electronics and electric power, chemical industry, electroplating ultrapure water, boiler feed water and ultrapure water for medicine.

Using yin bed, yang bed, and mixed bed, the deionized ultrapure water treatment equipment we usually call uses a reverse osmosis host plus a two-stage mixed bed, and uses an ion exchange method to remove cations and anions in the water in an ionic state. Sodium chloride (NaCl) represents inorganic salts in water. Rinse the resin with clean water first, then alternately soak the exchange column with 4-5% HCl and NaOH for 2-4 hours, rinse with a large amount of clean water between acid and alkali until the effluent is close to neutral, and repeat this for 2-4 hours. 3 times, each time the amount of acid and alkali is twice the volume of the resin. The last treatment should be carried out with 4~5% HCl solution, drain the acid solution, rinse with water until it is neutral, and then use it.

Pretreatment of anion exchange resin: first rinse the resin with clean water, then alternately soak the exchange column with 4 ~ 5% NaOH and HCl for 2 ~4 hours, rinse with a large amount of water between alkali and acid until the effluent is close to neutral, repeat this 2~3 times, each time the amount of acid and alkali is twice the volume of the resin. The last treatment should be carried out with 4~5% NaOH solution, drain the lye with water, rinse with water until it is neutral, and then use it. Hybrid ion exchanger regeneration process: After the ion exchange resin has been used for a period of time, the adsorbed impurities are close to saturation, and regeneration treatment is required to restore its original composition and performance.

At present, the commonly used chemical agent acid-base method for domestic resin regeneration restores the exchange capacity of the failed resin. The use of acid is usually HCl or H2SO4, and the deployment concentration is about 3-5%; the use of alkali is generally NaOH, and the deployment concentration is 3-5%. About 5%. 1. Backwash stratification: The backwash flow rate is 10 m/h, and the backwash time is 15 minutes. The stratification effect is judged by whether the interface between the positive and negative resin layers is clear after settling. 2. Enter the regeneration solution: Pump the required regeneration solution in about 20 minutes, soak for 2-3 hours and then use the method of positive washing, rinse with anion resin until the alkalinity of the effluent is about PH=8-9, and rinse with cation resin Until the acidity of the effluent is around PH=5-6.

3. Mixing: Enter nitrogen from the bottom (compressed air, vacuum pumping, etc. can also be used) for mixing, the inlet pressure is 0.1~0.15MPa, the inlet volume is 2.5~3.0m3/(m2·min), and the mixing time is generally 5 ~10 minutes, and the end point is that the resin in the column is fully mixed. Poolking is the best swimming pool equipment manufacturer and supplier in China. Poolking exists to provide the highest quality swimming pool equipment while offering competitive pricing..

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