Pemulihan air dari sintetik air sisa minyak melalui osmosis hadapan dengan menggunakan membran komposit nipis telah dijalankan dalam kerja ini. Kesan-kesan kepekatan minyak, kepekatan rumusan menelap dan kadar aliran silang rumusan menelap terhadap prestasi membran telah dikajikan. Tiga kepekatan minyak dalam rumusan asal iaitu 10 ppm, 25 ppm dan 50 ppm telah digunakan dalam kajian ini manakala kepekatan rumusan menelap dan kadar aliran silang rumusan menelap telah masing-masing dimanipulasi kepada 1 M, 1.5 M, 2 M dan 6 GPH, 8 GPH, 10 GPH. Pengukuran sudut kenalan yang kurang daripada 90°, iaitu 60.3°, menunjukkan membran komposit nipis mempunyai ciri hidrofili. Kadar fluks menelap menjadi kurang dengan peningkatan kepekatan minyak daripada 10 ppm kepada 50 ppm adalah disebabkan formasi lapisan kek yang semakin tebal. Selain itu, peningkatan kepekatan menelap daripada 1 M NaCl kepada 2 M NaCl telah mempertingkatkan kadar fluks disebabkan kewujudan perbezaan tekanan osmosis yang lebih besar. Kadar fluks menelap meningkat apabila kadar aliran silang meningkat daripada 6 GPH ke 10 GPH disebabkan peningkatan ricih permukaan. Membran komposit nipis didapati mempunyai purata penolakan minyak sebanyak 99.76 % dan kadar fluks sebanyak 1.06 L/m2.h.
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Water recovery from synthetic produced water via forward osmosis was performed in this work using thin film composite membrane. The effect of oil concentration, draw solution concentration and draw solution cross flow velocity on membrane performance were studied. Three oil concentrations in feed solutions which are 10 ppm, 25 ppm and 50 ppm were used in this forward osmosis process. Whereas, the draw solution concentrations and draw solution cross flow velocities were manipulated to 1 M, 1.5 M, 2 M and 6 GPH, 8 GPH, 10 GPH respectively. Contact angle measurement showed that the thin film composite membrane is hydrophilic with contact angle less than 90° which is 60.3°. With the increased of oil concentration from 10 ppm to 50 ppm, the permeate flux had been reduced due to the increased of cake layer. On the other hand, the increment of draw solution concentration from 1 M NaCl to 2 M NaCl had enhanced the membrane performance with improved permeate flux as greater driving force in term of osmotic pressure difference was created to draw the water from the feed side. When the cross flow velocity increase from 6 GPH to 10 GPH, the permeate flux was also increased due to the increasing surface shear. The thin film composite membrane was found to have an average oil rejection of 99.76 % and flux of 1.06 L/m2.h.
Water recovery from produced water via forward osmosis / Lim Siow Yoke