Abstract
The coastal areas in Indonesia often have a problem of clean water lack, because the water is classified as brackish water. Therefore, this research investigated the fabrication of CA membranes using phase inversion method for brackish water treatment. Investigation was conducted to study the effect of combination dope composition and evaporation time on separation performance and morphology of the memrbane. Membrane was fabricated by dry-wet phase inversion technique with variation of polymer concentration 17, 18 and 20 wt% in the total solid and evaporation time of 5, 10 and 15 seconds, respectively. The asymmetric membranes were characterized by permeability test through rejection and flux measurements using brackish water as feed. The experimental results from SEM images analysis showed that all the membranes have a thin small porous layer and thicker sub-structure of larger porous layer formed asymmetric membrane. Moreover, the greater polymer concentration is resulting smaller pore size and smaller membrane porosity. The longer evaporation time was also resulted in denser membrane active layer. The best membrane performance was observed at the composition of 20 wt% CA polymer, 1 wt % polyethylene glycol with the solvent evaporation time of 15 seconds.
Highlights
Membrane separation could be defined as a selective barrier between two phases
The decrease of flux was caused by lowering of membrane porosity with increasing polymer concentration
Increased of polymer concentration will be lead to the increasing number of polymer concentration at the membrane interface
Summary
Membrane separation could be defined as a selective barrier between two phases. The advantages of membrane based separation are continuous process, energy efficient, modular, can be operated under mild condition, membrane properties are adjustable, wthout any required additives. With aforement benefits of membrane usage, the application of membrane become more extensive such as desalination of saline water, sea water and brackish water, the concentration and separation in industrial waste water (waste water treatment), sterilization and purification of potable water, gas separation, biomedical technology [1]. Research about membrane which focuses on conditioning of membrane production is still interesting. Many factors in fabrication process variables affect the characteristic, morphology, and separation properties of membrane. By combining several various parameters allows obtaining tailor-made membranes that are specific to a particular separation purposes
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