Deionized water

1. What causes high conductivity in incoming water? 2. Does it have an impact on the units that use the desalinated water? There are many reasons for the increase in the conductivity of water entering the system, such as changes in the water source or the intrusion of other water sources ； To solve the problem, it’s best to find out the reason for the sudden sharp increase in conductivity. A high conductivity of the feed water will inevitably lead to an increase in the conductivity of the produced water. This may have an impact on the entities that use the demineralized water, such as those that require specific levels of conductivity and silica content for boiler water or process water. If such an impact does occur, it is necessary to install additional equipment, such as mixed-bed filters or EDI systems; otherwise, if no impact is observed, it can be left unaddressed for now due to cost considerations. High inlet water conductivity can also affect the desalinated water system, increasing its operational load. In the case of membrane-based systems, it is necessary to monitor whether the pressure difference between sections increases rapidly in order to determine whether chemical cleaning is required. For systems that use resin exchange, it is important to increase the frequency of regeneration to ensure proper quality of the output water.

Hello, layer owner! What are the likely reasons for the shortened resin regeneration cycle at the desalination plant?

The reasons for the shortened regeneration cycle need to be analyzed in detail: 1. A sudden increase in the conductivity of the feed water or an excessive flow rate of the feed water can increase the operating load on the resin, resulting in a shorter regeneration cycle. 2. Improper resin regeneration procedures result in poor regeneration quality, which also leads to a shorter regeneration cycle. 3. Heavy metals in the water cause resin poisoning, such as copper and aluminum entering the resin. 4. During normal operation, some of the resin that has become completely ineffective is replaced each year, as resin does have a limited service life. Analyze each item one by one, rule them out, and then address the issue; of course, there could also be other reasons, which need to be determined based on the actual situation.

Thank you to the thread owner for sharing their valuable insights; I’ve learned a lot from it{:2_36:}

If the conductivity of the water entering the RO system increases, it is likely due to the introduction of some other water source; or it could be that during the dry winter season, the conductivity also rises.

The amount of water produced per cycle with resin is reduced, and this is generally related to improper resin regeneration procedures. If there is a shortage of cation exchange resins, it’s necessary to check whether there is any uneven distribution of fluid in the resins (at the bottom and through the middle pipes), or if there are significant changes in the quality of the incoming water. In the case of a shortage of anion exchange resins, it’s important to examine the performance of the decarburizer and determine whether the silica level is too high; if so, hot alkali at 40-50 degrees should be used during regeneration. There are also various factors related to mixed-bed resins, such as incomplete stratification, poor control of liquid levels during regeneration, which can lead to cross-contamination, uneven mixing of the resins, and excessive carbon dioxide levels in the RO water. Then there are some special situations, such as resin poisoning and contamination or a decrease in the amount of resin; these generally do not occur, but they still need to be checked.

The raw water level is over 4000; is it tap water? It’s still groundwater. There should be a water softener before the reverse osmosis process to reduce hardness; otherwise, the lifespan of the reverse osmosis membrane will be shortened

Reading the replies from all of you experts has been very informative