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Improper Operation Of Reverse Osmosis Equipment Causes Damage To Membrane Performance
- Jul 27, 2018 -

Improper operation of reverse osmosis equipment causes damage to membrane performance


1 Residual gas in reverse osmosis equipment runs under high pressure, forming an air hammer will damage the membrane


There are often two situations: A. After the equipment is emptied, when the gas is re-run, the gas is quickly boosted when it is not exhausted. The remaining air should be drained at a pressure of 2 to 4 bar, and then gradually boosted. B. When the joint between the pretreatment equipment and the high pressure pump is not well sealed or leaks (especially the microfilter and the pipeline behind it), when the pretreatment water supply is not sufficient, such as microfiltration, the seal is not sealed. A good place sucks in some air due to the vacuum. The microfilter should be cleaned or replaced to ensure that the tubing does not leak. In short, the flow should be gradually increased without bubbles in the flow meter, and the bubbles should be gradually reduced during operation to check the cause.


2 The reverse osmosis device is not correct when it is shut down.


A. The quick step-down at shutdown is not completely flushed. Since the concentration of the inorganic salt on the concentrated water side of the membrane is higher than that of the raw water, it is easy to foul and contaminate the membrane.


B. Rinse with pretreated water with chemical reagents. Water from chemical reagents may cause membrane fouling during equipment outages.


When the reverse osmosis equipment is ready to shut down, it should stop adding chemical reagents and gradually reduce the pressure to about 3 bar and rinse with pretreated water for 10 minutes until the TDS of the concentrated water is close to the TDS of the raw water.


3 Disinfection and maintenance of reverse osmosis equipment lead to microbial contamination


This is a common problem in the use of composite polyamide membranes, because the polyamide membrane is poor in residual chlorine resistance, and the disinfectant is not properly added during use, and the user does not pay enough attention to the prevention of microorganisms, which is likely to cause microbial contamination. At present, many manufacturers produce pure water microbes exceeding the standard, which is caused by poor disinfection and maintenance.


The main performance is: RO equipment is not maintained with disinfectant at the factory; after the equipment is installed, the entire pipeline and pretreatment equipment are not disinfected; disinfection and maintenance measures are not taken for intermittent operation; there is no regular disinfection of pretreatment equipment and reverse osmosis equipment. The maintenance fluid is not working or the concentration is not enough.


4 Reverse osmosis equipment residual chlorine monitoring is weak


If the pump with NaHSO3 fails or the liquid solution fails, or the activated carbon is saturated, the membrane will be damaged due to residual chlorine.