反渗透膜污染预测模型的改进

Improvement of Reverse Osmosis Membrane Fouling Prediction Model

在反渗透非平衡热力学模型的基础上,从膜表面污染层阻力和浓差极化阻力的角度对常见的膜通量模型进行了探讨与改进,推导出了新的反渗透膜污染预测模型,为准确预测膜污染进程提供了理论支持。采用卷式反渗透膜装置对氢氧化铁胶体溶液进行处理,对模型计算值与实测值进行相关性分析,相关系数大于0.95。由此认为,改进的反渗透膜污染预测模型可用于计算运行过程中的膜通量。

Based on the non-equilibrium thermodynamic model of reverse osmosis,the traditional membrane flux model was studied and improved from the angles of resistances caused by fouling layer and concentration polarization on the membrane surface.A new reverse osmosis membrane fouling prediction model was formulated,which can provide a theoretical support to predict the membrane fouling process exactly.The iron hydroxide colloidal solution was treated in the device with spiral-wound reverse osmosis membrane.The correlation between the calculated results and the experimental values were analyzed,and the result shows that the correlation coefficient is more than 0.95.Therefore,the improved reverse osmosis membrane fouling prediction model can be used to calculate the membrane flux in operation process.