Mechanism of water treatment by high permeability-selectivity time dimension membrane method
Traditional solid-liquid two-phase membrane separation technology,which utilizes size effects,is easily constrained by the trade-off between permeability and selectivity,membrane fouling and concentration polarization.By introducing rotating shear dynamic membrane technology and applying solid-liquid slip boundary conditions,the time difference between particles penetrating the membrane pores radially and sliding over the membrane pores tangentially-temporal selectivity,can effectively enhance both permeability and selectivity simultaneously.By establishing a slip boundary rotating shear dynamic filtration membrane model,conducts finite element simulation of its microfiltration process for dilute suspensions,and theoretically revealed the influence of key parameters such as slip velocity,membrane thickness and porosity on membrane separation performance.The results show that for membrane pore diameters that are 1-10 times larger than the particles,under the synergistic effect of time dimension selectivity and shear-induced migration of particles,there is still a particle selectivity of over 95％and an effective water flux of more than 350 L/(m2·h).This result further verifies and expands the applicability of the temporal selectivity mechanism at the micron scale,and provides a new idea for high permeability-selectivity dynamic membrane water treatment technology.
water treatmentmembranesfiltrationsolid-liquid two-phase separationtemporal selectivitycomputational fluid dynamics
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维普
