本研究之主要目的探討不同高子材料製備出不同孔徑超過濾複合膜應用於含油廢水之油水分離。研究中利用水為沉澱劑並以濕式相轉換成型並改變鑄膜組成調整複合膜之表面結構。研究中利用環境掃描式電子顯微鏡(SEM)觀察陶瓷複合膜表面及皮層結構、接觸角利用探討薄膜親疏水性並以超過濾系統探討含油廢水之油水分離性能。研究中改變高分子濃度變化及鑄膜液添加劑製備出孔隙度差異之超過濾複合膜，其中所製備醋酸纖維素/丙酮複合膜，含油廢水COD為1,000,000ppm、濁度為10000NTU進行含油廢水分離測試，醋酸纖維素10wt%添加丙酮2.5wt％時，於操作壓力1kg/cm2下，其透出液通透量15 L /m2hr而濁度206NTU。以7.4wt%聚嗍?膜製備複合膜，操作壓力3kg/cm2，其透出液通透量8L/m2hr濁度為125NTU。以聚嗍?/醋酸纖維素製備複合膜，聚嗍?10wt%與醋酸纖維素1.40wt%，操作壓力3kg/cm2，其通透量15l/m2hr濁度為130NTU。以聚嗍?/PEG製備複合膜，聚嗍?9.6wt%與9.6PEGwt%，操作壓力3kg/cm2，其透出液通透量11L /m2hr濁度為140NTU。由研究結果顯示以聚嗍?膜所製備之複合膜處理含油廢水分離效果最佳，通透量可達8 L/m2hr，其選擇性較其它三種複合膜佳，可明顯降低含油廢水之濁度及COD。本研究在油水分離試驗結果發現，膜面孔洞大小與操作壓力、進料溫對於分離性能有顯著影響，複合膜具備有較佳的通透量及選擇性時，須有適當的孔洞特性及過濾過程之剪切力要高過貫穿膜面之穿透壓力。 The purpose of this study is to prepare a suitable ultrafiltration membrane with optimum pore size for oil/water separation via various polymers and different preparation compositions by wet phase inversion method. The water was used as coagulant and different casting compositions of polymer solution were used to prepare suitable pore size composite membranes. SEM was used for surface and cross section observation of composite membrane morphology. The hydrophilicity was determined by the water contact angle measurement. The separation performances of composite membranes wereclarified by the testof ultrafiltration with high cod oil/water wastewater. It was found that the polymer concentration and additive content in casting solution significant affected the pore size and cross section structure of prepared membranes. The cellulouse composite membrane presented a 15 L /m2hr permeation flux and permeate turbidity was 206 NTU with 10000 NTU wastewater in feed, while the preparation condition is 10 wt% cellulous content and 2.5 wt % acetone additive in casting solution membranes.Thepolysulfone composite membrane with 7.4 wt% polymer content in casting solution presented a 8 L /m2hr permeation flux and permeate turbidity was 125 NTU with 10000 NTU wastewater in feed, while the operation pressure up to 3 atm. The polysulfone/ PEG blend composite membranes showed a 11 L /m2hr permeation flux and permeate turbidity was 140 NTU with 9.6 wt % polymer and 9.6 wt% PEG content in the casting solution.The results indicated that the polysulfone composite membranes showed the superior performance in oil/water separation with a permeation flux up to 8 L /m2hr and significant improved the turbidity and COD removal of wastewater. It is concluded that the pore size on the surface of composite membrane, operation pressure and feed temperature of UF operation dominated the separation performance of oil/water separation. The optimum surface pore properties and shear force must be superior to the transport pressure of permeate transport through the membrane to obtain a high performance oil/water separation membrane.
