How to solve the problem of low output water from the cation exchange water treatment column?
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The water treatment method used for the boilers in our facility is primary double-deionization; the raw water passes through a dual-flow filter before entering a two-chamber cation exchange resin bed, and after passing through that bed it goes on to the carbon removal fan. . . . The situation in my workshop right now is as follows: the water quality is good after it passes through the dual-flow filter, but once it enters the dual-chamber cation exchange resins, the quality of the output water becomes excellent. However, the resistance associated with those dual-chamber cation exchange resins is very high. I would like to ask fellow experts – how can this be explained? What should be done to solve this? Our unit’s water treatment system has been in use for two years. My personal analysis is that after two years of use, some of the resin breaks apart, or there is mud or dirt between the resin particles, which blocks the gaps between them and results in higher resistance in the anion exchange bed – is that correct? To solve this, we still need everyone’s help. Anxious, waiting eagerly!
This post was last edited by gjn1970 on 2012-12-25 at 10:22. Your analysis makes sense. Is there a spare anion exchange resin unit? It is recommended to shut down the system and open the manhole for inspection; as you mentioned, all of the resin can be removed, then soaked in a sodium chloride solution, followed by washing using a sieve with mesh size larger than that of the cation exchange resin particles, before reinstalling it. But this only provides a temporary solution; it is best to add an activated carbon filter after the dual-flow filter.
Our unit currently has three anion exchangers, but two are needed in operation with one as a backup. What I’m doing now is using the anion exchanger with lower flow rate as the backup; whenever another anion exchanger stops working, this one is brought online so that the faulty exchanger can be regenerated promptly. At an appropriate time, I also plan to open the manhole or sight glass for inspection; any broken resin will be removed, and any sludge will be regenerated outside the system before being filtered. If I don’t want to turn on the device itself first, are there any other ways to effectively increase the water output? Now, after draining the water from the cation exchange bed, I try to feed water at high speed in an attempt to achieve a certain effect, but it doesn’t work; nor does it work when feeding water at low speed. Do any of you sea friends have any other good tips?