Ultrapure water manufacturers share the damage to membrane elements caused by improper operation of

Ultrapure water manufacturers share the damage to membrane elements caused by improper operation of equipment

by:Ocpuritech     2021-03-19
Damage ultrapure article manufacturers share the improper operation of the device caused by the membrane elements: a reverse osmosis device residual gas is operated under high pressure, the hammer will damage the membrane 1 is formed after the device is evacuated, when re-run, no gas When exhausted, the pressure is increased quickly. The remaining air should be exhausted at a pressure of 2 to 4 bar, and then the pressure should be gradually increased. 2. When the joint between the pretreatment equipment and the high-pressure pump is not well-sealed or leaks (especially the microfilter and its subsequent pipeline is leaking), when the pretreatment water supply is insufficient, if the microfiltration is blocked, the sealing is not sufficient. In good places, some air will be sucked in due to the vacuum. The micro filter should be cleaned or replaced to ensure that the pipeline does not leak. In short: The pressure should be gradually increased when there are no bubbles in the flowmeter. If bubbles are found during operation, the pressure should be gradually reduced to check the cause. 2. The method when the reverse osmosis equipment is shut down is incorrect. 1. When shutting down, the pressure is quickly reduced without thorough flushing. Because the concentration of inorganic salts on the concentrated water side of the membrane is higher than that of the raw water, it is easy to scale and contaminate the membrane. 2. Rinse with pretreatment water with chemical reagents, because water containing chemical reagents may cause membrane fouling during equipment shutdown. When the reverse osmosis water treatment equipment is ready to shut down, the chemical reagents should be stopped, and the pressure should be gradually reduced to about 3 bar and rinsed with pretreated water for 10 minutes until the TDS of the concentrated water is very close to the TDS of the raw water. 3. Poor disinfection and maintenance of reverse osmosis equipment leads to microbial contamination. This is a common problem in the use of composite polyamide membranes, because polyamide membranes have poor resistance to residual chlorine, and disinfectants such as chlorine are not properly added during use, plus users Insufficient attention to microbial prevention can easily lead to microbial contamination. Many manufacturers produce pure water with excessive microorganisms, which is caused by inadequate disinfection and maintenance. The main performance is: when leaving the factory, RO equipment is not maintained with disinfectant; after the equipment is installed, the entire pipeline and pretreatment equipment are not disinfected; no disinfection and maintenance measures are taken for intermittent operation; there is no regular disinfection of pretreatment equipment and reverse osmosis equipment ; The maintenance solution is invalid or the concentration is not enough. 4. Inadequate monitoring of residual chlorine in reverse osmosis equipment. For example, the pump for adding NaHSO3 fails or the chemical solution fails, or the activated carbon is saturated with residual chlorine to damage the membrane.
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