How to ensure that the pure water equipment meets drinking water standards?

1. Even if the high-pressure pump of the reverse osmosis device is interrupted for a short period of time, the device may malfunction.

2. When the reverse osmosis device stops, use low-pressure feed water 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).

3. When the pressure difference between the inlet and outlet of the reverse osmosis device exceeds the standard, it indicates that the reverse osmosis 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.

4. Excessive feed water flow will deteriorate 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. The hydrolysis of the cellulose acetate membrane is likely to cause deterioration of the performance of the reverse osmosis device. For this reason, the pH value of the water must be strictly controlled, the pH value of the feed water must be maintained at 5-6, and the composite membrane can be in the range of feed water PH3-PH11 run.

6. 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. However, for composite membranes and 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.