What is the method of reverse osmosis desalination treatment equipment system fouling?
What is the method of reverse osmosis desalination treatment equipment system fouling? Author: freshwater resources is now gradually reduced, desalination equipment is widely used in major industries, especially reverse osmosis desalination equipment, but after a period of time tend to have a lot of dirt, then how to prevent it most of the sea? In applications, especially when the recovery rate is less than 40%, new scale inhibitors/dispersants can be used to prevent scaling. There is also a problem of adding acid, scale inhibitor or both. 1. Adding acid: Adding acid is an effective method to control CaCO3 scaling. According to the calculation software, the Stiff-Davis index in concentrated water is positive. It shows that there is a tendency of CaCO3 scaling. If the Stiff-Davis index is negative, there is no tendency to scale. The Langelier index cannot judge the scaling tendency of seawater concentrated water. Acidification will not prevent the deposition of other dispersible dissolved salts (CaSO4, BaSO4, etc.). In most cases, when it is necessary to adjust the pH of the reverse osmosis feed water, it is recommended to use special or food grade H2SO4. 2. Addition of scale inhibitor/dispersant: Inorganic salt sodium hexametaphosphate (SHMP) is a common use The scale inhibitor can be used to prevent the deposition of CaCO3 and CaSO4. Many new composite scale inhibitors. Can prevent the deposition of inorganic salts. It needs to be selected according to the calculation software of each scale inhibitor manufacturer. 3. Simultaneous use of acid and scale inhibitor: The simultaneous use of acid and scale inhibitor includes two situations: when the pH of the product water meets the expected requirements, and the scale inhibitor is added according to the water quality. When the CaCO3 scaling tendency is serious (due to the high content of calcium and magnesium ions in the feed water or the higher recovery rate). The above is the method to prevent the system fouling of the reverse osmosis desalination equipment. The above three methods can effectively prevent the system fouling of the reverse osmosis desalination. The desalination equipment should also be checked frequently when it is in use, and the equipment should be found in time. If you still don’t understand the problem, you can call to consult environmental protection.
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