微滤膜垢分形生长的过程模拟

基于微滤膜系统污垢形成机制和分形理论,建立微滤过程膜表面混合垢生长DLA模型,并通过实验验证了模型模拟的可行性和准确性。选取不同运行周期条件下微滤膜系统中的受污染膜丝,进行膜垢污染生长的实时测试,并与不同运行条件下模型的动态模拟结果进行实际比较分析,结果表明两者分形维数相近,且分形维数与膜污染程度呈正相关,说明该模型能够动态表征膜污染水平,可揭示出微滤过程中膜垢生长的动态变化规律,预测出膜材料的受污染水平。

Process simulation of fractal growth of microfiltration membrane fouling

Based on the formation mechanism of microfiltration membrane fouling and the fractal theory,a diffusion-limited aggregation (DLA) model of microfiltration membrane fouling was established.Its accuracy and feasibility were validated with experiments.Membrane fibers of microfiltration systems contaminated under different operation cycles were taken to test the real-time growth of membrane fouling.These test results were compared with their simulation counterparts from the dynamic model for different operating conditions.The comparisons show that the fractal dimensions of the experiment results and the dynamic model are similar.Furthermore,the fractal dimensions of the dynamic model are positively correlated with the degree of membrane fouling.Therefore,it is shown that this model can simulate the dynamic of membrane fouling degrees,reveal changing dynamics of the growth of microfiltration membrane fouling during filtration processes,as well as predict the degree of fouling of membrane materials.