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DOI : ,    Vol.22, No.1, 15 ~ 30, 2014
Title
Permeation Behavior of Alumina Colloidal Suspension with the Variation of Membrane Orientation in Regenerated Cellulose Microfiltration System
남석태 Suk Tae Nam
Abstract
This study examined the effect of membrane orientation on permeation behavior in microfiltration by measuring the flux of Al2O3 colloidal suspensions through the cross flow microfiltration. The membranes used for experiments are regenerated cellulosic membrane. The permeate flux of front side orientation (mode of active layer facing colloid solution) was smaller than that of back side orientation (mode of support layer facing colloid solution). This behavior is probably mainly caused by the truncated conical pore shape of asymmetric membrane. The flux decline was due to the membrane fouling such as cake formation on the membrane surface and pore blockings by particles. The fouling mechanism was dominantly governed by cake filtration combined with pore blocking. At the range of operating pressure between 0.29 and 1.18 bar with 200 mg/L suspension, the water permeate flux through 0.2 μm membrane was about 70% of the flux through 0.45 μm membrane. The water permeate flux was more affected by variation of operating pressure with the front side orientation compared to with the back side orientation. With the fouling resistance calculated by a regression method of relative flux, the ratio of total membrane fouling for the front side orientation to that for back side orientation was 1.83 times at 0.29 bar of operating pressure, 1.91 times at 0.58 bar, and 1.11 times at 1.88 bar. At the front side orientation of operating pressure 1.18 bar, the total fouling was composed of 14.1% of complete pore blocking, 9.1% of standard pore blocking, and 76.8% of cake formation, For each fouling mechanisms, the front side orientation resulted in higher values compared to the back side orientation.
Key Words
regenerated cellulose, microfiltration, membrane orientation, fouling, alumina
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