Reverse osmosis: referred to as RO, is a membrane separation technology developed in the 1960s. The principle is that raw water passes through the RO membrane under high pressure. The solvent in the water diffuses from high concentration to low concentration to achieve the purpose of separation and process purification. And concentrate. Because it is opposite to the direction of natural penetration, it is called reverse osmosis. RO filter can remove bacteria, viruses, colloids, organic matter and more than 98% of soluble salts in water. The method has low operating cost, simple operation, high degree of automation, and stable effluent quality. Compared with other traditional water treatment methods, it has obvious advantages and is widely used in various industries related to water treatment.
Five. Ion exchange
Various inorganic salts in water are ionized into cations and anions. When the equipment passes through the hydrogen ion exchange layer, the cations in the water are replaced by hydrogen ions. This is the principle of desalination of the cation bed.
Various inorganic salts in water are ionized into cations and anions. When they pass through the OH-type ion exchange layer, the anions in the water are replaced by oh ions. This is the desalination principle of the anion bed.
Mixed bed is an ion exchange device that mixes anion and cation exchange resins in a certain ratio in the same exchange column. The resin layer is evenly mixed, and the Yin and Yang resins are staggered tightly. 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 a series of multiple beds. Since the hydrogen ions and hydroxide ions that enter the water by reverse osmosis after mixed ion exchange can immediately generate water molecules with a lower ionization degree, it is rarely possible to form cations or anion exchange counter ions, so that the exchange reaction is very thorough. Therefore, the water quality of the mixed bed is better than the double bed of yin and yang in series, and the effluent purity is higher