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What causes the pretreatment effect of RO water treatment equipment to become worse?
- 2019-07-22-

The pretreatment process can be said to be a very important part of RO water treatment equipment for reverse osmosis. It is the core system protection device before entering the water in the equipment. Poor pretreatment process treatment will affect the working function of the RO water treatment equipment. . In general, the reasons for the poor pretreatment of reverse osmosis RO ultrapure water equipment are mainly the following.

First, the filter diameter is too small or the filter layer is too low

Because in the pretreatment filter, the depth of penetration of particulate impurities mainly depends on the particle size of the filter material. Under the same operating conditions, the larger the diameter of the filter, the greater the depth of particulate matter penetrating the filter layer. The higher, it can also effectively extend the filtration cycle. In addition to adding the height of the filter layer, it is also conducive to the ability of the filter layer to intercept dirt.

Second, the shape of the filter material and the vacancy rate of the filter layer

Because the shape of the filter material will affect the surface area of the filter material, the larger the surface area of the filter material, the greater its ability to intercept dirt and the higher the filtration power.

If multi-angled broken particle filter material is used, the filtering power of the filter layer can be increased because of its large surface area. In general, the surface area of the filter material is inversely proportional to the vacancy rate of the filter layer. The larger the capacity of the large pore filter layer to intercept pollution, the lower the filter power.

Third, then filter the flow rate

The filtration speed generally refers to the speed at which water passes through the air filtration equipment when there is no filter material, which is also called "empty tower speed". The filtering speed of the filtering equipment should not be too slow or too fast. Slow filtration rate means that the output per unit filtration area is small. In order to achieve a certain output, the filtration area needs to be increased, which will increase investment. If the filtration speed is too fast, the quality of the effluent water will be reduced, and the filtration cycle will be shortened due to the large head loss. When filtering coagulation-clarified water, the filtration speed is generally 8-12m / h.

Fourth, then the uniformity of the water flow

During the filtering or backwashing process of the filtering equipment, the water flow needs to be evenly distributed along the filtering section, otherwise a partial flow will be formed, which will affect the filtering and backwashing effects. In the filtering equipment, the water distribution system has a great effect on the uniformity of the water flow. In order to make the water flow uniform, a low-resistance water distribution system is generally used.

The above is the reason why the pretreatment process of the reverse osmosis RO ultrapure water equipment is poor, and I hope it will help us.


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