POLYVINYLIDENE FLUORIDE HOLLOW FIBER MEMBRANES FOR REFINERY WASTEWATER TREATMENT: EFFECT OF AIR GAP LENGTH ON MEMBRANE MORPHOLOGY AND PERFORMANCE
| Main Authors: | Yuliwati, Erna, Ismail, Ahmad Fauzi, Mohruni, Amrifan Saladin, Matsuura, T |
|---|---|
| Format: | Article PeerReviewed application/pdf |
| Terbitan: |
AMTEC-Universiti Teknologi Malaysia
, 2013
|
| Subjects: | |
| Online Access: |
http://eprints.unsri.ac.id/4756/1/ASM_MST_2013_Kuala_Lumpur.pdf http://eprints.unsri.ac.id/4756/ |
Daftar Isi:
- Abstract Effects of air gap length on outer surface morphology and filtration performance of hydrophilic polyvinylidene fluoride (PVDF) hollow fiber membrane have been studied. Porous asymmetric hydrophilic PVDF membranes were prepared via a phase inversion method, using N,N-dimethylacetamide (DMAc) as solvent, lithium chloride monohydrate (LiCl.H2O) and titanium dioxide (TiO2) as inorganic additives. Submerged membrane ultrafiltration was conducted using non-ionic solutes of different molecular weight and refinery wastewater with constant suspended solid concentration. The comparison of the performance and morphology was conducted between PVDF membranes of different air gap length at 1, 4, 11, and 15 cm. The prepared membranes were characterizedthrough observations of field emission scanning electron microscope (FESEM) and atomic force microscopy (AFM), permeate flux measurement, and tensile property test.Average pore size and surface porosity were calculated by the permeate flux in submerged membrane system. It is resulted that the permeate flux is mainly determined by effective porosity.Moreover, the average pore size and nodules size were increased, while outer surface membrane was being smoother with increasing of air gap length. AFM analysis reveals that the air gap introduces an elongation stress due to the gravity on the membrane surface. Under the air gap length of 11 cm, high permeate flux of 148.53 L/m2h and suspended solids removal of 99.82 % and also relatively high mechanical strength of membrane can be simultaneously achieved. It is concluded that there exists the best range of the air gap length for relatively high performance of membrane Keywords: air gap length; roughness; pore size; porosity; flux.