The biofouling mechanism of organic mixtures on porous polyvinylidene fluoride membranes was tested to determine how to examine the fouling potential of a membrane for water treatments with more representative feed compositions including protein, polysaccharides, and natural organic matters. The three-dimensional structure and compositions of the fouling layers were examined using confocal laser scanning microscopy and the filtration resistances of the fouled membranes were estimated. The filtration resistance analyses demonstrated that feeds with a single-component foulant will cause serious clogging in the pores and form a looser fouling layer structure on the membrane; however, a mixed composition resulted in less clogging in the pore and a denser layer structure on the membrane because of over-deposition and interactions among the foulants. The fouling potential of a membrane examined with a single-component will result in an under-estimation of the filtration resistance of the fouling layer and an over-estimation of irreversible fouling.

测试了多孔聚偏二氟乙烯膜上有机混合物的生物结垢机理，以确定如何检查具有代表性蛋白质成分（包括蛋白质，多糖和天然有机物）的水处理膜的结垢潜力。使用共聚焦激光扫描显微镜检查结垢层的三维结构和组成，并估算结垢膜的过滤阻力。耐过滤性分析表明，含单组分污垢的进料会引起严重的孔堵塞，并在膜上形成较松的污垢层结构。然而，由于污垢之间的过度沉积和相互作用，混合的组合物导致孔中的堵塞减少，膜上的致密层结构减少。