Matters needing attention in the use of reverse osmosis equipment

Reverse osmosis equipment is one of pure water equipment. The successful application of reverse osmosis technology in pure water equipment provides a good development space for drinking water in my country. The use of reverse osmosis equipment requires attention to some details. First of all, if the filter element for water treatment in reverse osmosis equipment has residual gas running under high pressure, it will form an air hammer and damage the membrane. Generally, there are two situations: 1. After the equipment is emptied, when it is re-run, the gas is not exhausted and the pressure is quickly boosted. The remaining air should be exhausted under the pressure of 2 ~ 4bar, and then gradually increase the pressure to run. 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 pipelines), when the pretreatment water supply is insufficient, if the microfiltration is blocked, the sealing A good place will suck in some air due to the vacuum. The microfilter should be cleaned or replaced to ensure that the pipeline does not leak. Secondly, the method when the reverse osmosis equipment is shut down should be correct. Rapid depressurization must be thoroughly rinsed when shutting down. Since 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 foul the membrane. At the same time, it should be rinsed with pretreated water with chemical reagents added. Membrane fouling may occur during plant shutdowns due to water containing chemicals. When preparing to shut down, stop dosing chemical reagents, gradually reduce the pressure to about 3 bar, rinse with pretreated water for ten minutes, until the TDS of concentrated water is very close to that of raw water. The disinfection and maintenance of reverse osmosis equipment must be in place. If the disinfectant such as chlorine is not added correctly during use, and the user does not pay enough attention to the prevention of microorganisms, it is easy to cause microbial contamination. At present, the pure water microorganisms produced by many manufacturers exceed the standard, which is caused by poor disinfection and maintenance. The main manifestations are: the RO equipment is not maintained with disinfectant when it leaves the factory; the entire pipeline and pretreatment equipment are not disinfected after the equipment is installed; the disinfection and maintenance measures are not taken during intermittent operation; the pretreatment equipment and reverse osmosis equipment are not regularly disinfected. ; Maintenance fluid failure or insufficient concentration. At the same time, attention should be paid to the protection of film performance. New reverse osmosis membrane elements are usually stored in sealed plastic bags after soaking in 1% NaHSO3 and 18% glycerol in water. In the case that the plastic bag is not broken, it will not affect its life and performance if it is stored for about 1 year. When the plastic bag is opened, it should be used as soon as possible to avoid adverse effects on the components due to the oxidation of NaHSO3 in the air. After testing the reverse osmosis equipment, we have adopted two methods to protect the membrane. The test machine runs for two days. After about 15 to 24 hours, it is maintained with a 2% formaldehyde solution; or after two to six hours of operation, it is maintained with a 1% NaHSO3 aqueous solution. Both methods can obtain satisfactory results and can be selected according to the actual situation. The first method is relatively expensive and suitable for use when the idle time is long, and the second method is used when the idle time is short.
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