Resins tau dav siv hauv kev kho dej. Hauv kev kho dej, nws tuaj yeem siv rau cov dej softening thiab desalination los tsim cov dej softened, dej ntshiab thiab dej ultrapure; Hauv kev kho cov dej khib nyiab, qee cov khoom tsis zoo hauv cov dej khib nyiab tuaj yeem raug tshem tawm, thiab cov tshuaj muaj txiaj ntsig, cov hlau hnyav thiab cov khoom tsis tshua muaj tuaj yeem rov qab tau, Hauv kev lag luam tshuaj lom neeg, biopharmaceuticals, thiab lwm yam, nws tuaj yeem ua tau zoo sib cais, concentration, purification, thiab lwm yam.
I believe that many friends in water treatment field knew or have used water treatment resins. Today we will talk about water treatment resins in details.
01 What is "resin"?
Resin: siab molecular polymer spherical particles nrog peb -dimensional mesh qauv thiab adsorption xaiv yam ntxwv.
Kev kho dej resin muab faib uacation resin thiab anion resin, cation resin ntxiv subdivided rau hauv sodium hom thiab hydrogen hom, sodium hom resin pauv calcium thiab magnesium ions nyob rau hauv dej rau hauv sodium ions kom soften cov dej. Hydrogen resin yog los pauv calcium thiab magnesium ions hauv dej rau hauv hydrogen ions kom muag dej. Anion resin muaj cov hydroxide ions hloov tau, uas tuaj yeem hloov cov kua qaub ions hauv dej. Nyob rau tib lub sijhawm, kev siv cov anion resin thiab hydrogen cation resin tuaj yeem ua rau cov dej muag muag. Dej ua dej ntshiab.
Hauv kev lag luam kho dej, kev sib pauv ion yog cov tshuaj tiv thaiv ntawm cov ions hauv dej thiab cov ions ntawm cov ion txauv resin nrog ib qho equi- them nyiaj molar.
02 Cov teeb meem uas yuav tshwm sim hauv kev siv cov resin
Backwash loss
If the backwash flow is too large or the backwash operation is abnormal, resin loss will occur, and a large amount of resin is often found in the trenches and waste water pools.
2. The flow-through part is damaged
Resin leaks tawm ntawm cov cuab yeej thiab nkag mus rau hauv ncej- cov khoom siv lossis cov khoom siv dej, ua rau muaj teeb meem hauv kev ua haujlwm ntawm kev tshaj tawm - cov khoom siv thiab ua rau cov dej tsis zoo.
3. The resin layering is not clear For example, mixed bed requires two resins to be well layered, otherwise the water production and effluent quality will be reduced. In severe cases, the effluent will fail to meet the required indicators.
4. Contamination of cation resin by turbidity
The turbidity of the influent water exceeds the requirement or the precipitation phenomenon occurs in the direct-current coagulation. When more suspended solids enter the first-stage ion exchanger, the phenomenon of resin pollution will occur. These suspensions often contain coagulants, typically salts of high-valent metal ions.
5. Calcium sulfate precipitation
Thaum sulfuric acid yog siv los tsim cov cationic resin, yog tias cov concentration ntawm sulfuric acid siab dhau thiab cov dej ntws qeeb dhau, calcium sulfate yuav tso rau ntawm qhov chaw ntawm cov khoom, uas ua rau lub zog ntawm cov effluent. Nyob rau lub sijhawm no, nws tuaj yeem rov tsim dua tshiab nrog hydrochloric acid ib zaug kom yaj cov tshuaj sulfuric acid, lossis yaug nrog dej ntau hauv lub sijhawm.
6. Hlau ua paug
Both cation and anion resins have the problem of being polluted, but the mechanism of iron pollution of these two resins is different. In the primary desalination equipment, the cation resin contacts the raw water with iron ions, iron agglomerated products and corrosion products. After the iron ions in the water are absorbed by the cationic resin, it is difficult to regenerate, and the corrosion products become iron ions during regeneration. Iron ion pollution will make the color darker, accelerate oxidative degradation, gradually reduce performance, and deteriorate the quality of effluent. Silicon, organic matter, etc. combine together to form a complex material form to contaminate the anion resin, and this contamination is cumulative.
7. Colloidal silica
Gelled silica yog ib qho tshwm sim los ntawm kev tsim kho tsis zoo ntawm lub hauv paus muaj zog anion resins. Thaum qhov sib piv ntawm silica thiab muaj zog acid anions nyob rau hauv cov dej nyoos yog loj los yog muaj ib tug tsis muaj zog puag anion resin absorbing muaj zog acid nyob rau hauv dej, qhov tshwm sim ntawm colloidal silica tej zaum yuav tshwm sim nyob rau hauv lub regeneration ntawm anion resin. Qhov tshwm sim no yuav tshwm sim ntau dua thaum cov lye concentration siab thiab qhov kub thiab txias ntws tsawg.
8. Organic pollution
Organic paug ntawm resins yog ib qho teeb meem loj hauv kev kho dej. Raws li cov pa phem ntawm cov dej ntuj tau dhau los ua hnyav dua, cov pa phem ntawm cov resin tau ua rau muaj kev hem thawj rau kev kho dej. Qhov muaj zog alkalinity ntawm cov resin, qhov hnyav dua qhov kev ua qias tuaj ntawm cov organic.