Pollution Analysis of Ion Exchange Resin in Operation

　　The pollution of ion exchange resin in the process of operation showed that the color became darker, the exchange capacity of resin continued to decline, the clean water increased, the quality of effluent became worse, and the production capacity of effluent declined. Ion exchange resins can be divided into styrene resin and acrylic resin according to their matrix types. The main properties and types of resins are determined by the types of chemical active groups in resins. Firstly, it can be divided into cationic resins and anionic resins, which can exchange ions with cations and anions in solution respectively. Cationic resins can be divided into strong acidity and weak acidity. Anionic resins can be divided into strong alkalinity and weak alkalinity. It can be considered that the resin has been contaminated

　　The organic matter caused by (+-*/}) tends to be negatively charged in water and has become the main pollutant of anionic resin. Organic substances mainly exist in natural water humic acid, micellar organic impurities, polymers with relative molecular weight of 500-5000 and polyorganic phosphoric acid. These substances adsorb on the resin, some occupy or combine the active groups on the resin, and some make the alkalinity of the strong alkali active groups of the resin decrease and degrade, thus reducing the ion exchange capacity of the anion exchange resin. This contamination can be detected from chemical oxygen demand monitoring. Pollution caused by grease usually contains oily substances, forming membranes, and active groups in blocked or coated microporous resins are extracted by ion interactions. ion exchange resin

　　Contamination of suspended solids in water (+-*/}) liquid membranes are tightly wrapped around the resin surface, thus separating the ion exchange process of the resin and causing the resin to be contaminated, which is mainly caused by cationic resins. Because of colloidal substances

　　As a result of pollution, colloidal particles in water often contain negative ions, which pollute anionic resins. Ion exchange resin is composed of classification name, skeleton (or gene) name and basic name. The pore structure is divided into two types: gel type and large pore type. All macroporous resins with physical pore structure are added "big hole" before the full name. If the classification is acidic, the word "yang" should be added before the name, while the classification is alkaline, and the word "yin" should be added before the name. Such as: macroporous strong acidic styrene cation exchange resin. Colloidal silica is the most harmful to resin. It adsorbs and polymerizes on the surface of anion exchange resin in order to prevent resin from exchanging ions.

　　High valence metal ions in ion exchange resins (e.g. the reverse movement of high valence metal ions in coagulants) cause raw water

　　Highly polluted, such as A13 + and Fe3 + diffusion into cationic resins, the exchange potential energy of these high valent metal ions is higher, and the fixed ions SO 32 - in resins form Al (SO3) 3, Fe (SO3) 3, etc. Therefore, the use of this part of fixed ions loses its function and the ability to exchange free ions.

　　Contamination caused by impurities in ion exchange resins is often mixed with many impurities. Ion exchange resin is composed of classification name, skeleton (or gene) name and basic name. The pore structure is divided into two types: gel type and large pore type. All macroporous resins with physical pore structure are added "big hole" before the full name. If the classification is acidic, the word "yang" should be added before the name, while the classification is alkaline, and the word "yin" should be added before the name. Such as: macroporous strong acidic styrene cation exchange resin. Longqi is an impurity in caustic soda (NaOH), such as pure Fe3+, NaCl, Na2CO3, etc. Anionic resins are the most polluted.