Tiga jenis penuras tiub, iaitu 13 μm bukaan celah, 4 μm bukaan lingkar dan 0.45 μm membran seramik, serta penuras kepingan 13 μm bukaan celah telah digunakan untuk menapis 1000 ppm emulsi minyak dalam air. Penahanan zarah minyak berdasarkan saiz bukaan penuras juga diuji dengan memasukkan 17 mm pilin ke dalam penuras tiub bukaan celah dan bukaan lingkar. Data ujikaji telah dinilai dengan menggunakan model-model penurasan. Model ubah bentuk zarah menunjukkan bahawa kelemahan penyingkiran minyak adalah disebabkan oleh tegangan antara muka sistem emulsi yang rendah dan menyebabkan zarah minyak mudah melepasi bukaan penuras meskipun pada tekanan operasi membran yang rendah. Walau bagaimanapun, keputusan yang ditunjukkan oleh model–model penurasan mencadangkan bahawa penuras mikro bukaan celah dapat mengurangkan kegagalan fluk, serta penggunaan pilin boleh mengurangkan rintangan terhadap penurasan.
Kata kunci: Ubah bentuk zarah; model penurasan; emulsi minyak dalam air
Three types of tubular filters, i.e. 13 μm slots, 4 μm circular pores and 0.45 μm ceramic membranes, and 13 μm flat sheet slots were used to challenge 1000 ppm oil in water emulsion, the test liquid. The rejection of oil drops by pore size was also evaluated by incorporating a 17 mm pitch helix within the tubular slots and circular pore filters. The experimental data were analysed using filtration models. The model of droplet deformation indicates that poor rejection was caused by a low interfacial tension of emulsion system and that the oil drops could easily penetrate the filters even at low transmembrane pressure. However, the results of filtration models suggested that the use of slots was more likely to reduce the flux decay and the incorporation of a helix can greatly reduced the resistance to filtration.
Key words: Droplet deformation; filtration models; oil in water emulsion
Evaluation of HLB values of mixed non-ionic surfactants on the stability of oil-in-water emulsion system
