考察了气液两相流在DK2540F卷式纳滤（NF）膜组件中对酵母/MgSO₄混合物的强化分离效果。研究了不同条件下对卷式纳滤膜渗透通量、截留率和渗透通量增加率的影响。结果表明，两相流能够明显提高酵母/MgSO₄混合物在卷式NF膜中的分离效果。在跨膜压力较高、气液比较大的条件下，酵母悬浮液的通量明显增强，通量增加率可达15.2%。同时，在分离酵母/MgSO₄混合物时，跨膜压力越低，气液比越高，增强效果越好，渗透通量的增长率能够达到40%以上。另外，气液两相流几乎不影响MgSO₄的截留率，且MgSO₄的截留率几乎维持在90%~94%之间。

The enhancement separation efficiency of yeast/MgSO4 mixtures via gas-liquid two-phase flow is evaluated in a DK2540F spiral nanofiltration membrane module.Investigation is performed to determine the effects of different conditions on permeate flux,rejection and permeate flux increase rate of the spiral nanofiltration membrane.The experimental results indicate that two-phase flow can obviously enhance the separation effect of yeast/MgSO4 mixture in spiral nanofiltration membranes.The permeate flux of yeast suspension is obviously enhanced by higher trans-membrane pressure and larger gas-liquid ratio,with a growth of 15.2%.Meanwhile,better enhancement effect for separating yeast-MgSO₄ mixture can be achieved under lower trans-membrane pressure and higher gas-liquid ratio,and permeate flux can lift by 40% or more.Additionally,gas-liquid two-phase flow affect scarcely the rejection of MgSO₄ that remains mostly between 90% and 94%.

蒋婉莹(1991-),女,硕士研究生,研究方向为膜分离技术,JiangWanying951@163.com