Reverse Osmosis System Very Obvious

Reverse Osmosis (RO) is a very effective membrane separation unit operation, Reverse Osmosis System which relies on the reverse osmosis membrane to separate solvent and solute in solution under pressure. Reverse osmosis technology can reduce the load of the ion exchange resin by more than 90%, Reverse Osmosis System resin recycled agent dosage can also be reduced by 90%, in addition to salt, but also remove the water particles, organic matter, colloid material, to reduce the pollution of ion exchange resins, Reverse Osmosis System prolong service life has a good role.

However, for a long time, the reverse osmosis technology seems powerless for the removal of free CO2 in water, because the traditional reverse osmosis technology must control the value of LSI (i.e. Langlille saturation index) in order to prevent the fouling of ro membrane. and the LSI value control an important parameter is the water ph value, if the ph value is acidic, then is not easy scaling, if the ph is alkaline, Reverse Osmosis System then the scaling tendency is very obvious. Therefore, the traditional process in the reverse osmosis system before adding HCL solution, can well prevent CaCO3, MgCO3 and other precipitate scaling, Reverse Osmosis System and rarely in the reverse osmosis system before adding NaOH solution.

The most widely used is the carbon dioxide degassing tower, because the water contains a large number of carbonate salinity, after the H-type ion exchanger (i.e. cation exchange bed) treatment, Reverse Osmosis System the h on the resin is replaced into the water and become carbonic acid, so the CO2 tower is generally placed at the back of the cation exchange bed and the front of the anion exchange bed. When the ph value of water is less than 4.3, the water of carbonic acid is almost entirely in the form of carbon dioxide, Reverse Osmosis System the following changes:

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When the h increases, that is, the lower the ph, the above reaction to the right, at this time, with a device of water from the top of the spray, air from the bottom blowing, Reverse Osmosis System so that the air flow and drop full contact, because the amount of carbon dioxide in the air is very small, the partial pressure is very low, Reverse Osmosis System only accounts for 0.03% of the atmospheric pressure, according to Henry's law, the water treated by the H-type ion exchanger is taken away by the high carbon dioxide, Reverse Osmosis System which is driven into the lower air stream, thus removing the carbon dioxide from the water, That is, remove a lot of water in the anion $modeltype, this can greatly reduce the burden of the yin bed, improve the cycle of water production, reduce the consumption of recycled agents.

Vacuum Degassing Tower is also a way to remove CO2, Reverse Osmosis System in addition to the removal of water O2 and other substances, removal efficiency than the CO2 tower higher than the high. It works by spraying water from the top with a device, after the filter material is dispersed, the water CO2 and O2 escape, and the vacuum pump in the middle of the tower vacuum, CO2 and O2 by the vacuum pump suction, Reverse Osmosis System degassing after the pure water flow to the bottom of the tower, after the mixed bed supply pump pressurization into the after treatment mixed bed. If the inlet of the vacuum degassing tower is weakly acidic, the carbonate in the water can be removed in large quantities, Reverse Osmosis System because when the ph value of water is less than 4.3, the water in the form of carbonic acid almost entirely in carbon dioxide, due to the reverse osmosis water production is generally weak acidity, so the vacuum degassing tower is generally placed in the back-level of the reverse osmosis.

Before the reverse osmosis system is added NaOH solution to remove the water CO2 method, compared with the traditional degassing tower and degassing film, the one-off investment cost and running cost are low without adding extra large equipment, and taking full advantage of the desalting ability of RO system, in addition, it is beneficial to remove organics in water because of the addition of Lye. Reverse Osmosis System But in the way of control must be strict, this is not a two-level approach to reverse osmosis, but the A-level approach is particularly important.