Today, I will briefly introduce two water treatment processes, ion exchange process and reverse osmosis water treatment process.
One, ion exchange process
1. The principle of desalination of the anion bed: a variety of inorganic salts in water ionize to generate cations and anions. When passing through the OH-type ion exchanger layer, the anions in the water are replaced by OH- ions;
2. The principle of desalination of the cation bed: a variety of inorganic salts in water ionize to generate cations and anions. When passing through the hydrogen ion exchanger layer, the cations in the water are replaced by hydrogen ions.
3. Mixed bed: An ion exchange device in which cation and anion exchange resins are mixed in proportion and packed in the same exchange column.
4. Ion exchange process: uniformly mixed resin layer, cation resin and anion resin are arranged in close staggered arrangement, each pair of cation resin and anion resin particles is similar to a group of multiple beds, so the mixed bed can be regarded as multiple beds running in series.
Since the hydrogen ions and hydroxide ions that enter the water after the mixed ion exchange generate water molecules with a low degree of ionization, it is seldom possible to form a cation or anion exchange. Therefore, the effluent water quality of the mixed bed is composed of cation and anion exchange in series. The water quality that can be achieved by the multiple bed can produce product water with very high purity.
2. Reverse osmosis water treatment process
RO is abbreviated as RO, a membrane separation technology developed in the 1960s.
1. Principle: The raw water passes through the reverse osmosis membrane under the action of high pressure, and the solvent in the water diffuses from high concentration to low concentration to achieve the purpose of separation, purification and concentration. Because it is opposite to the direction of natural penetration, it is called reverse penetration.
2. Function: Reverse osmosis can remove bacteria, viruses, colloids, organic matter and about 98% of soluble salts in water.
3. Advantages: It has the characteristics of low operating cost, simple operation, high degree of automation, stable water quality, and small floor space. Compared with other traditional water treatment methods, it can be applied to various industries related to water treatment.
reverse osmosis water treatment process is basically a physical desalination method.