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Rejection of Oil Emulsion using Tubular Surface Filters (Penyingkiran Emulsi Minyak
dengan Penuras Permukaan Tiub)
Muhammad Abbas Ahmad
Zaini*
Centre of Lipids
Engineering & Applied Research, Universiti Teknologi Malaysia
81310 Skudai, Johor, Malaysia
Iain W. Cumming &
Richard G. Holdich
Department of Chemical
Engineering, Loughborough University
LE11 3TU, United Kingdom
Diserahkan: 3 Jun 2011 /
Diterima: 1 September 2012
ABSTRACT
This study was aimed to characterize
the rejection of oil emulsion by two tubular surface filters, namely 13 μm
slots and 4 μm circular pores. A 17 mm helix was incorporated inside the
filters to increase the wall shear stress. Rejection of oil, throughputs and
flux decay were measured at varying shear stresses (Rw)
and transmembrane pressures (TMP).
The results showed that the13 μm slots produced a fairly good oil
rejection of 22 μm at Rw=0.26
Pa and TMP=6.9 kPa, while the
circular pores gave the rejection of 14.4 μm at Rw=0.21
Pa and TMP=34.5 kPa. The results
suggested that the circular pores filter could achieve a better oil retention
under lower TMP, while the slots filter
could be satisfactorily operated under moderate shear stress and low TMP. The increase of TMP offered poor oil rejection by
both filters and this was also true for slots-helix configuration.
Keywords: Helical insert;
microfiltration; oil emulsion; rejection; surface filter
ABSTRAK
Kajian ini
bertujuan untuk mencirikan penyingkiran emulsi minyak oleh dua penuras permukaan
tiub, iaitu 13 μm bukaan celah dan 4 μm bukaan lingkar. Tekanan ricih dinding ditingkatkan dengan menggabungkan 17 mm pilin
ke dalam penuras. Penyingkiran minyak, hasil turasan
dan kegagalan fluk telah diukur pada tegasan ricih (Rw)
dan tekanan transmembran (TMP)
yang berbeza. Hasil kajian menunjukkan bahawa 13 μm bukaan celah
menghasilkan penyingkiran minyak yang agak baik iaitu 22 μm pada Rw=0.26 Pa dan TMP=6.9
kPa, manakala bukaan lingkar memberikan penyingkiran 14.4 μm pada Rw=0.21 Pa dan TMP=34.5
kPa. Hasil kajian mencadangkan bahawa penuras bukaan lingkar boleh mencapai
penahanan minyak lebih baik di bawah TMP yang
lebih rendah, manakala penuras bukaan celah boleh dikendalikan dengan sempurna
di bawah tegasan ricih sederhana dan TMP yang
rendah. Peningkatan TMP memberikan
penyingkiran minyak yang rendah bagi kedua-dua penuras dan begitu juga dengan
penurasan bukaan celah-pilin.
Kata
kunci: Emulsi minyak; penurasan mikro; penuras permukaan; penyingkiran; pilin
masukan
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*Pengarang untuk surat-menyurat; email: abbas@cheme.utm.my
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