Study On The Influence Of Magnetic Filed On Separation Performance Of Membrane

Membrane separation technology as a newly efficient separation, purification and concentration of purification technology has broad application prospects. However, there still exist some problems in the application of technical and economic issues that have great potential to be discovered. So we may improve membrane flux and reduce operational costs if we bond magnetic and membrane separation technologies and change the magnetic properties of bonding between the solute and solvent. This text combined the membrane separation technology with magnetic technology. Take seawater and the inorganic salt solution being different magnetism as object, to study the change of solution physical chemistry character which was affected in magnetic field, for example, the change of surface tension, viscosity, conductivity and pH value of the solution, the change of membrane flux and separate efficiency in magnetic field. This text also discussed the cause of the change.Results indicated that seawater's surface tension coefficient and viscosity were reduced after magnetied and the conductivity had nothing change, but pH value rises. Nothing to do with the magnetic field direction. After membrane filtration, the magnetization effect still lasts, the permeate's surface tension coefficient, viscosity, conductivity and pH value reduce equally. The various seawater parameters both show the fluctuating change with the magnetic intensity. When the magnetic field intensity is 0.3 T, every parameter optimum value appears on generally. Magnetization can increase membrane flux and decrease decline factor. Nothing to do with the magnetic field direction. After magnetizing the salts solution of different magnetic properties, the retention of various metal ions were higher before the magnetization. High extent is in proper order: paramagnetism matter＞ferromagnetism matter＞diamagnetism matter. The highest values of retention rates are occurring in 0.3 T.The article summarizes the effect of magnetic field on the fermentation liquid membrane filtration process. Found that magnetizing also can increase the membrane flux and the removal rate of protein and COD.The article analyzed Performance principle that the external magnetic field is applied to the material properties From the magnetic material sources, the relationship between molecular potential energy and magnetic viscosity, and the relationship between the surface tension and to be able to rise to extreme external magnetic field causes the magnetic field analysis of the impact of material, and thinking that the magnetic field affects the molecular orientation which led to the rearrangement of the molecules in solution induced. This text has thought that the increasing of membrane flux is due to the reduction of solution's surface tension, the increasing of the contact angle between Solution with membrane surface, the lower of the solution's viscosity, and the improving of solvent's penetration rate.Based on the above test results, this paper regard it if we applied the magnetic field to the membrane separation process, can improve the performance of membrane separation, is a good saving energy and reducing consumption method.