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Professional manufacture factory for waste incinerator, sewage treatment and sludge dewatering equipment.
Nowadays, every industry has high quality requirements for water, with the change of social demand, water treatment equipment is widely used, nanofiltration membrane and reverse osmosis membrane in sewage equipment is also widely used, so who is better? Let’s take a look at it.
As a filter membrane product, the core is its pore size; The size of the aperture reflects its filtration accuracy. The pore size of the reverse osmosis membrane is 0.002~0.0003um, which makes the reverse osmosis membrane can intercept dissolved salts, colloidal particles, bacteria, viruses, microorganisms, organic matter, inorganic minerals and heavy metals in addition to water molecules, some molecules, ions, etc. The nanofiltration membrane does not have such high filtration accuracy as the former. However, many water treatment scenarios do not require such high filtration accuracy; For example, the preparation of mineral water requires the retention of some necessary minerals, and the reverse osmosis membrane cannot be used. Because the reverse osmosis membrane will remove all these minerals , and nanofiltration membrane can selectively remove. So we can see that the filtration accuracy of the reverse osmosis membrane is higher.
The recovery rate and the ratio of inlet and outlet water is a very important parameter in water treatment process. The water production efficiency of the filter membrane product has a great relationship with the recovery rate, usually the higher the accuracy of the filter membrane and the higher the water quality requirements, the lower the recovery rate. The recovery rate of reverse osmosis membrane is generally lower than that of nanofiltration membrane, and the water production rate of multi-stage system is also lower than that of nanofiltration membrane. Therefore, the water production efficiency of nanofiltration membrane. Therefore, the water production efficiency of nanofiltration membrane is higher.
Although both nanofiltration membranes and reverse osmosis membranes have general, nanofiltration membranes do not have the same requirements for influent water quality as reverse osmosis membranes. Therefore, users using nanofiltration membranes can reduce a certain amount of pretreatment process consumption, and the inlet waterof reverse osmosis membranes needs to undergo more stringent and lower consumption pretreatment. At this point, the operating cost of nanogiltration membrane is also lower than of reverse osmosis membrane. Therefore, nanofiltration membrane has lower requirements for inlet water quality.
Nanofiltration membranes and reverse osmosis membranes are good, but in actual application scenarios, they each have their own advantages. For example, in seawater desalination systems, it is better to use reverse osmosis membranes; In the preparation of mineral water, nanofiltration membrane is better. Therefore, who is betetr than nanofiltration membrane and reverse osmosis membrane should be judged according to actual use.
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