非牛顿液体恒速微滤部分堵塞膜过滤机理的研究

Study on the model of partial blocking filtration mechanism in constant-rate microfiltration process of non-Newtonian fluid

非牛顿液体的膜过滤机理的研究是目前膜过滤工艺需要研究解决的关键问题之一.为描述非牛顿液体的恒速部分堵塞微滤膜过程的压强变化数学模型,利用拓展至非牛顿流体的Darcy方程,建立了非牛顿流体膜过滤基础方程,并通过引入微滤膜部分堵塞微滤机理模型,推导了基于Darcy方程的非牛顿液体的恒速微滤总压强变化规律.在恒速条件下,分别利用聚酰胺(PA,0.22μm,0.45μm)平板膜对质量浓度为0.5%的CMC溶液进行微滤实验对上述模型进行了验证.结果表明:实验测得的数据和推导的模型基本吻合.

Membrane filtration mechanism is one of major study projects for membrane filtration process. In order to depict the mathematic model of the pressure variation for partial blocking of MF membrane under constant rate condition, the basic membrane filtration equation for non - Newtonian fluid was established based on the extended Darcy equation for non- Newtonian fluid and the pressure variation role of MF for non- Newtonian fluid was derived by introducing the model of partial blocking MF. The above model was proved by the flat membrane filtration test for CMC solution of 0.5 % using polyamid （PA, 0.22 μm, 0.45μm） membrane under the constant rate condition. Results indicated that the experiment data basically fitted with the derived model.