Ion exchange adsorption method is a commonly used method in water treatment technology, referring to the equipment and process of water treatment through a resin layer containing cation and anion exchange sites in the solution surface for adsorption and replacement of ions in water. It is used for the treatment of various types of difficult and easy biodegradable wastewater and for various other combination water quality treatment processes.
The principle of ion exchange adsorption method is to use a hygienic quality more stable synthetic resin adsorption medias containing cation exchange sites and anion exchange sites. The cation exchange area can weakly adsorb ammonium, calcium, magnesium and other cations in the water to achieve its water softening function. For anion exchange area, it can adsorb through the strong anion exchange ability of natural organic acids such as humic acid and fulvic acid in water, so that weak anion such as phosphate, sulphate and bicarbonate will be adsorbed and removed, thus the water quality can be improved and clarified.
In the ion exchange adsorption process, the system is equipped with PLC control system to implement automatic control of water inlet, resin regeneration and water outlet. When the concentration of ions exceeds the set value, it can automatically start, switch, clean and regenerate the media in the adsorption system, so as to control and maintain the optimal water quality.
The ion exchange adsorption method has a wide range of applications in water treatment. For example, it is often used to remove organic matter, suspended solids, cation and anion from water and wastewater. In order to improve the water quality, the ion exchange adsorption method is also often used in combination with other water treatment processes, such as sedimentation and flocculation, membrane filtration, chemical precipitation and chlorination, to further purify the water quality.
When using ion exchange adsorption, the most important thing is to select the right resin. Generally, the selection of resin should be based on the content of pollutants and water quality. For example, if it needs to remove nitrogen and phosphorus, a strong anionic resin should be selected. The type, quality and service life of the resin will directly affect the performance and price of the treatment system.
In addition to the resin selection, cation and anion exchange adsorption and regeneration processes also need to be considered. For cation exchange adsorption, it usually uses hydrochloric acid, sulfuric acid or sodium hydroxide solution to regenerate the resin layer; for anion exchange adsorption, it usually uses hydrochloric acid or sulfuric acid to regenerate the resin.
In summary, ion exchange adsorption method is a widely used water treatment process which has strong ability to remove organic matter and reduce the content of cation, anion and suspended solids in water. Through accurate selection of resin and control of adsorption and regeneration process, the water quality of the treatment system can be improved significantly.
