Model suspensions are important substances for characterizing fouling processes to study the mechanism of membrane fouling, thus, choosing a suitable standard suspension is critical for researches on membrane fouling processes. The pretreatment methods of model suspensions have long been neglected, which can alter the physical and chemical properties and affect fouling results. This study compared four different pretreatment methods (centrifuging and drying, magnetic stirring, ultrasonic processing, and dissolving in buffer solution) and found effects on size distribution, dispersion stability, pH variation over time, and fouling properties. Among the characterization of model suspensions, different pretreatment methods led to various changes in physical and chemical properties in this study. Membrane filtration experiments showed that these four pretreatments changed the rate of membrane fouling. The results of the analysis of filtration flux for suspensions indicated that for ultrasonic processing of all suspensions and magnetic stirring of kaolin suspensions, pore blocking was the main mechanism, while cake formation was dominant for the others. Therefore, special attention should be placed on different pretreatment methods and selecting appropriate model foulants. Finally, some guidance on selecting appropriate model foulants was given in the study.

模型悬浮液是表征结垢过程以研究膜污染机理的重要物质，因此，选择合适的标准悬浮液对于膜污染过程的研究至关重要。长期以来，模型悬浮液的预处理方法一直被忽略，这会改变物理和化学性质并影响结垢结果。这项研究比较了四种不同的预处理方法（离心和干燥，磁力搅拌，超声处理以及在缓冲溶液中溶解），并发现了对尺寸分布，分散稳定性，pH随时间变化和结垢特性的影响。在模型悬浮液的表征中，本研究中不同的预处理方法导致了理化性质的各种变化。膜过滤实验表明，这四种预处理改变了膜污染的速率。悬浮液的过滤通量分析结果表明，对于所有悬浮液的超声处理和高岭土悬浮液的磁搅拌，主要的机理是孔阻塞，而其他的主要是滤饼形成。因此，应特别注意不同的预处理方法并选择合适的模型污垢剂。最后，在研究中给出了选择合适的模型污垢物的一些指导。而蛋糕的形成则占主导地位。因此，应特别注意不同的预处理方法并选择合适的模型污垢剂。最后，在研究中给出了选择合适的模型污垢物的一些指导。而蛋糕的形成则占主导地位。因此，应特别注意不同的预处理方法并选择合适的模型污垢剂。最后，在研究中给出了选择合适的模型污垢物的一些指导。