With the increase of water temperature, the viscosity of water decreases. Under the same operating pressure, the water yield will change by about 3% for every temperature difference of 65438 0℃. It can be seen that the operating temperature of the system is very important in order to ensure stable water production. When treating water with high content of silicon and insoluble sulfate, the dissolved amount of these inorganic substances will decrease due to the decrease of temperature. When running at low temperature in winter, if the temperature is not controlled, it will lead to scaling of silicon and/or insoluble sulfate. In this case, a heat exchanger can be used to increase the water temperature. When the temperature control is difficult, it is necessary to add
Scale inhibitor or appropriate methods to reduce the recovery rate to adjust the operation of the system. The higher the water temperature, the higher the kinetic energy of ions passing through the membrane, and the lower the desalination rate of the system. When the membrane system runs above 35℃ for a long time, the aging speed of membrane elements may be accelerated.