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The research status of nanofiltration technology to remove nitrate in water environment is reviewed. The mechanism of nitrate removal by nanofiltration membrane (including Donan effect, dielectric effect and steric hindrance effect） is introduced in detail, and the formation principle of its rejection mechanism is introduced. It focuses on the influencing factors of nanofiltration membrane in the process of nitrate rejection (nanofiltration membrane itself, pressure, temperature, salt concentration, pH and magnetic field, etc.） and analyzes in detail each influencing factor in the process of nitrate rejection by nanofiltration membrane. Finally, the retention mechanism and influencing factors of nanofiltration membranes are summarized. [ABSTRACT FROM AUTHOR]

The domestic nanofiltration membrane is used to remove nitrate ions in the water environment, and the factors affecting the retention performance and flux of the nanofiltration membrane，such as the concentration of the inlet liquid? the flow of concentrated water, the pressure? and the temperature are studied・ The results show that the increase in pressure is beneficial to increase the rejection rate and prod・ net water flux of the nanofiltration membrane, the optimal pressure is 0.7 MPa, and the rejection rate and product water flux can reach 75. 0% and 153.7 L/(m2 • h) ;Properly increasing the inlet water temperature can increase the rejection rate of the nanofiltration process, the best inlet water temperature is 39 ・ 3 °C ・ The feed concentration has a significant impact on the rejection process, the lower the feed concentration, the better the retention effect of the nanofiltration membrane. [ABSTRACT FROM AUTHOR]

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