What are the precautions for the operation of two-stage reverse osmosis purified water equipment?
What are the precautions for the operation of two-stage reverse osmosis purified water equipment? Author: now the effect of pure water treatment equipment is there for everyone can see, in particular, two-stage reverse osmosis pure water equipment more obvious effects, which is why more and more enterprises begin to use reason pure water reverse osmosis equipment. The two-stage reverse osmosis purified water equipment is one of the more widely used reverse osmosis equipment. The two-stage reverse osmosis purified water equipment greatly meets the water demand of the laboratory, but we also need to pay attention to some details during the operation. Then, what are the precautions for the operation of the two-stage reverse osmosis purified water equipment? 1) The hydrolysis of the reverse osmosis membrane of the two-stage reverse osmosis pure water equipment can easily cause the performance of the reverse osmosis device to deteriorate. For this reason, the pH value of the water must be strictly controlled, and the pH value of the feed water is in the range of 3-11. 2) When the amount of injected sodium hypochlorite is insufficient and the free chlorine in the feed water cannot be measured, slime will occur on the membrane module of the reverse osmosis device, and the pressure difference of the reverse osmosis device will increase. But for polyamide membranes, the amount of free chlorine entering the membrane module must be strictly controlled. Exceeding the specified value will cause the membrane to oxidize and decompose. 3) If the water whose FI value exceeds the standard is supplied to the reverse osmosis device as feed water, dirt will adhere to the surface of the membrane module, so the dirt must be removed by cleaning. 4) Excessive feed water flow will degrade the membrane module in advance, so the feed water flow cannot exceed the design standard value. In addition, the flow rate of the concentrated water should be avoided as far as possible to be less than the design standard value. Operating under the condition of too small concentrated water flow will cause uneven flow in the pressure vessel of the reverse osmosis device and deposit fouling on the membrane module due to excessive concentration. 5) Even if the high-pressure pump of the reverse osmosis device is interrupted for a short period of time, it may cause the device to malfunction. 6) The inlet pressure of reverse osmosis must be maintained with a proper margin, otherwise the salt removal rate will be reduced due to the lack of proper compaction. 7) When the reverse osmosis device is stopped, low-pressure feed water is used to replace the water in the reverse osmosis device. This is to prevent the precipitation of silica during shutdown (due to the drop in water temperature in winter). 8) Always pay attention to the pressure difference of the security filter. The main reason for the sharp rise in pressure difference is the leakage of the turbidity of the security filter. On the contrary, the reason for the sharp drop in pressure difference is the damage of the precision filter element and the loosening of the fastening screw of the security filter element. 9) When the pressure difference between the inlet and outlet of the reverse osmosis device exceeds the standard, it indicates that the membrane surface has been contaminated or the feed water flow rate is above the design value. If the pressure difference problem cannot be solved by flow adjustment, the membrane surface should be cleaned. 10) In summer, when the feed water temperature is high, the product water flow is too much, and sometimes the operating pressure has to be lowered, which will cause the quality of the product water to decrease. In order to prevent this, the number of membrane modules can be reduced while the operating pressure remains at a higher level.
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