Research on the Application of Membrane Concentration Technology in the Reduction Treatment of High Salinity Wastewater
Membrane concentration technology has the advantages of simple operation,stable water production,and low cost,and has been widely used in wastewater desalination in recent years.Membrane concentration can achieve the reduction treatment of high salt wastewater,reduce the load of the evaporation system,and achieve zero discharge of wastewater.In order to investigate the application performance of membrane concentration technology in the treatment of high salt wastewater,nanofiltration membrane and reverse osmosis membrane are used in the experiment to treat high salt wastewater containing sodium sulfate,and the concentration reduction effects of the two membranes are compared.The experimental results show that high salinity wastewater with a total salt content of 8%is treated using nanofiltration membranes and reverse osmosis membranes,respectively,under operating pressures of 7.0 MPa and 7.5 MPa,the reduction rate of concentrated water can reach 50%,and the conductivity of concentrated water is greater than 100 mS/cm.Compared with reverse osmosis membranes,nanofiltration membranes have a larger pore size and lower osmotic pressure to overcome.When the operating pressure is the same,compared to reverse osmosis membranes,nanofiltration membranes have a faster water production rate and larger water production flux,however,under the same recovery rate,the operating pressure of nanofiltration membranes is lower.Overall,for high salinity wastewater,the concentration reduction effect of nanofiltration membranes is better than that of reverse osmosis membranes.
high salt wastewaterreduction treatmentmembrane concentrationnanofiltration membranereverse osmosis membrane
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