How to save the reverse osmosis membrane when large-scale engineering water treatment equipment stop

How to save the reverse osmosis membrane when large-scale engineering water treatment equipment stops running?

by:Ocpuritech     2021-05-09
How to save the reverse osmosis membrane when large-scale engineering water treatment equipment stops running? Author: In general large-scale projects, did not do for some time will take some time, some large equipment will stop running. Regarding what needs to be paid attention to when large-scale engineering water treatment equipment should be stopped, one is the equipment, and the other is the reverse osmosis membrane of large-scale engineering water treatment equipment. The following environmental protection will introduce some reverse osmosis membranes to you. How to store the reverse osmosis membranes for a long time? When the large-scale engineering water treatment equipment stops running, in order not to affect the normal use next time, it is generally longer than 48 hours that it needs to be stored for a long time. Then, how to save the reverse osmosis membrane of the large-scale engineering water treatment equipment for a long time? 1. Before saving , The system needs membrane cleaning to remove all contaminants and dirt deposited on the membrane surface (this operation is only used when the membrane element is contaminated or is expected to be contaminated). Before a long-term system shutdown, use standard cleaning procedures for cleaning and disinfection; after successfully completing the cleaning and disinfection, save as soon as possible. The closest cleaning and disinfection interval is 12 hours. 2. The storage is completed by the circulation of 500-1,000ppm sodium bisulfite solution in the cleaning system, and the membrane elements will be thoroughly wetted in the storage solution. In this way, the solution is circulated in the entire system, and the remaining air volume can be reduced to a small amount after the completion of the secondary circulation (about 1 hour). Make sure that there is no air in the system for sealing during storage, and the air tightness is good. 3. Close all valves on the supply side and the brine side. Any contact of sodium bisulfite solution with outside air (oxygen) will cause sodium bisulfite to be oxidized to sulfate, and the pH value will continue to drop. After all the bisulfite is consumed, the remaining oxygen will not be absorbed, and the biological state will become unstable. 4. The pH value of the preserved reverse osmosis system needs to be adjusted regularly (at least once a month) to ensure that the pH value of the solution will not be lower than 3. If the pH of the storage solution is found to be lower than 3, the storage solution must be replaced. The preservation solution must be replaced every month. 5. During the shutdown period, the storage temperature should not exceed 35℃, but not below 0℃ to prevent freezing. 6. A formaldehyde solution with a concentration of 0.2-0.3% by mass percentage can also be used instead of sodium bisulfite as the preservation solution. Formaldehyde is a stronger microbial killer than sodium bisulfate and does not contain oxygen in its composition. This is the end of the introduction about how the reverse osmosis membrane of large-scale engineering water treatment equipment does not need to be stored for a long time. I hope it will be helpful to everyone. Keep the reverse osmosis membrane so as not to cause damage.
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