基于XDLVO理论解析膜法水处理过程中膜污染问题的研究

Analysis and prediction of membrane fouling in water treatment based on the approach of the XDLVO theory

扩展的德亚盖因-兰多-弗韦-奥弗比克理论(The extended Derjaguin-Landau-VerweyOverbeek,XDLVO)可以用于定量解析界面之间的相互作用性质及程度,因而有助于理解膜法水处理过程中复杂的膜污染现象并提供膜污染问题的预防或解决思路.考察了近年来在相关方面理论解析膜与污染物相互作用的界面相互作用能的文献报道和研究进展,利用已有参数基于XDLVO理论进行计算和数据统计分析,总结出了不同膜材料和不同污染物在进行膜法水处理过程中容易发生膜污染的可能顺序,并调查了膜分离过程中溶液条件对膜污染的影响.进一步提出目前研究中存在的问题,并对XDLVO理论在膜污染问题解析方面的研究进行了展望.

The XDLVO theory can be used to quantitatively assess the nature and extent of interfacial interactions between two materials,which is beneficial to provide a better understanding in the complex membrane fouling phenomena of membrane processes in water treatment and thus provide possible directions in the approach of more effectively avoiding or solving the membrane fouling issue. This study examined the relevant theoretical analysis in the surface interaction free energy between membranes and pollutants reported in the literature in recent years,and,on the basis of available data,carried out calculation and statistical analysis. The results lead to a useful summary table showing the possible sequence or trend in membrane fouling for different types of membrane materials and pollutants in membrane water treatment applications. The study further discussed the effect of solution conditions on membrane fouling for membrane water treatment processes. Finally,the paper looked at some of the shortcomings in the membrane fouling study in the current practices and the prospect of utilizing the XDLVO theory for membrane fouling analysis and prediction for membrane water treatment.