Study on the Desalination Process of Hardness-removed Seawater with Reverse Osmosis

摘要

The influences of the pressure, temperature and pH on the property of reverse osmosis membrane Dow SW30 were investigated in self-designed equipment unit with hardness-removed seawater as raw material. The optimal process parameters were pre-compression pressure 3.5 MPa, operation pressure 3 MPa, the temperature of feed seawater 25-30°C, pH value 7-8 and feed flow rate 60 L/h. Under these conditions, the flux of reverse osmosis membrane SW30 kept stable for long-term operation, and its salt rejection rate was above 99.4%.