本研究利用薄膜阻塞模式，分析不同薄膜對微過濾中薄膜阻塞與粒子結垢之影響。實驗採用 PMMA粒子懸浮液與三種平均孔徑相近之薄膜：Isopore、Durapore和MF-Millipore進行恆壓過濾，探討薄膜阻塞模式與過濾阻力之差異，並建立薄膜阻塞圖探討阻塞指數、過濾速率與累積粒子量之關聯。阻塞指數可為阻力係數之單一函數。薄膜阻塞僅發生在過濾剛開始的期間，濾速或累積粒子量達臨界值時，阻塞指數突降至零，此時為濾餅過濾。同濾速下，因膜孔密度不同，阻塞指數 MF 最大，Isopore次之。若粒子累積量相同，則阻塞指數為Isopore最大，MF最小。比較三種薄膜臨界值發現：MF 臨界點發生在較低累積粒子量與較高濾速，而Isopore則反之。造成此差異為薄膜表面形態與孔道結構差異所致。 The effect of membrane morphology on the particle fouling in a "dead-end" microfiltration is studied by use of membrane blocking models. Three kinds of membranes: Isopore, Durapore, and MF-Millipore with two mean pore sizes are used for filtering PMMA particles. Membrane blockings occur in the early period of filtration; the blocking index then suddenly drops to zero at a critical point and follows the cake filtration model. The membrane blocking charts are established for relating the blocking index, filtration rate, and particle accumulation. The resistance coefficients can be correlated to a unique function of blocking index. MF is the easiest to be blocked under a fixed filtration rate; Isopore is also easier to be blocked due to its low pore density. In addition, Isopore has the highest blocking index while MF has the lowest under a given particle accumulation. To compare the critical conditions, the critical value of MF occurs at the lowest particle accumulation and the highest filtration rate, however, Isopore occurs at the highest particle accumulation and the lowest filtration rate. Those results are due to different membrane surface morphologies and membrane pore structures.
