Problems caused by improper operation of pure water equipment

Pure water equipment usually adopts reverse osmosis technology. Reverse osmosis is a membrane separation technology that can be driven by pressure with the help of selective permeation (semi-permeable) membranes. During osmotic pressure, water molecules continuously permeate through the membrane, flow into the central tube through the permeate flow channel, and then flow out at one end of the water impurities, such as ions, organics, bacteria, viruses, etc. The water flows out from the water outlet, so as to achieve the purpose of separation and purification. Improper operation of pure water equipment will cause damage to the performance of the membrane or water treatment filter element. 1. There is residual gas in the permeation equipment running under high pressure, and the formation of air hammer will damage the membrane. There are two situations: A. After the equipment is emptied, re-run When the gas is not exhausted, the pressure rises rapidly. The remaining air should be exhausted under the pressure of 2 ~ 4bar, and then gradually increase the pressure to run. B. 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 is not sufficient. 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. In short, the pressure should be gradually increased when there is no air bubble in the flowmeter, and the air bubble should be gradually depressurized to check the cause during operation. 2. Incorrect method when the osmotic equipment is shut down A. The rapid depressurization does not perform thorough flushing 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. B. Rinse with pretreated water with chemical reagents added. Membrane fouling may occur during plant shutdowns due to water containing chemicals. When the reverse osmosis equipment is ready to shut down, stop adding chemical reagents, gradually reduce the pressure to about 3 bar, and rinse with pretreated water for 10 minutes, until the TDS of the concentrated water is very close to the TDS of the raw water.
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