Asking about ion exchange issues and the cleaning of sediment in pipes
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As most people are aware, the order of ion exchange is as follows: for strongly basic anion resins, the general order of adsorption of inorganic anions is SO42‑ > NO3‑ > Cl‑ > HCO3‑ > OH‑. From this, it’s easy to understand why anion resins exchange out ions such as SO42‑, NO3‑, Cl‑, and HCO3‑ from water, since these ions come before OH‑ in terms of priority； The general order of adsorption of anions by weakly basic anion resins is as follows: OH－ > citrate 3－ > SO42－ > tartrate 2－ > oxalate 2－ > PO43－ > NO2－ > Cl－ > acetate – > HCO3－. Given this, how can weakly basic anion resins exchange anions in water? It should be OH- that comes out first, right? ? ? I’m not clear about this; please help those who understand. By the way, there is a lot of sludge in the pipes from which the wastewater exits the sedimentation tank. What are some good ways to clean it? The key is that it’s not straight; there are bends connecting it in the middle. The high-pressure water gun can’t be inserted; the pipe diameter is 150. I originally posted this question in the drainage forum, but no one answered it; so I’m posting it here today. My intention was nothing other than to resolve the problem I encountered. Please forgive me, moderators.
Please help everyone! ! ! I’m anxious.
This is a misunderstanding; many people in the resin industry don’t realize that weakly basic anionic resins are not of the chloride type after treatment with hydrochloric acid or of the hydroxide type after treatment with sodium hydroxide. Instead, they are in the free ammonia form from the moment they leave the factory, and no matter how they are transformed, they remain in the free ammonia form. Therefore, this order is correct.
Regarding the cleaning of wastewater pipes； Our company makes several small holes in the pipes and then uses a high-pressure cleaning device (the kind used for washing cars) to clean them ； The effect is decent; of course, regular cleaning is necessary.