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This post was last edited by hesonchang214 on 2020-4-2 at 15:08. I. Pay attention to proper temperature control During the reverse osmosis process in industrial pure water equipment, the temperature of the feed solution rises as operation time increases. Within a certain range, an increase in temperature leads to a decrease in the viscosity of the feed liquid, which facilitates an increase in the water production rate of reverse osmosis. Generally, for every 1-degree increase in temperature, the water-permeation capacity of the membrane increases by approximately 2.8%. For industrial pure water treatment equipment with good reputation, the specified water permeability of the membranes is at a water temperature of 24 to 25 degrees Celsius; when in use, it is necessary to apply a correction factor to calculate the water permeability under the actual operating temperature. It should be noted that the operating temperature must not exceed the membrane’s maximum heat tolerance, as this will affect its service life. II. Pay attention to proper pressure control. During the operation of industrial pure water equipment, if the operating pressure exceeds a certain limit, the membrane will be severely compressed and deformed, which leads to membrane aging and a reduction in its water permeability. Therefore, the appropriate operating pressure should be selected based on the actual liquid to be processed and the pressure resistance of the reverse osmosis membrane of the machine itself. Increasing and maintaining the operating pressure of industrial pure water equipment helps to improve water permeability, as the permeability of the membrane decreases when it is compressed tightly. III. Pay attention to controlling the pH value. Different types of reverse osmosis membranes used in industrial pure water systems have specific pH range requirements; for example, acetate fiber membranes can operate within a pH range of 3 to 8, while aromatic polyamide membranes can function within a pH range of 4 to 10. The normal pH value of acetate fiber membranes ranges from 4 to 7, while the allowable pH range for composite membranes is from 2 to 11. If the pH value of the feed solution exceeds the operating range of the membrane, it causes hydrolysis of the membrane, leading to a decline in its performance until the membrane is damaged.