| Summary: | 碩士 === 中原大學 === 化學工程研究所 === 102 === In this study wet spinning technology was used to fabricate PVC hollow fiber membranes. Pore forming agent PVP was additive to control membrane structure and increased flux.
Dope solution composition was changed in this study, the effect of pore forming agent molecular weight and dope solution concentration on membrane structure, flux and retention were discussed. In addition, the resulted membrane was treated by sodium hypochlorite. The effect of sodium hypochlorite on membrane flux we were discuss also. Experimental results shows pure water permeation was increased with additive concentration increasing after membrane treated by sodium hypochlorite. When additive was PVP (MW=360kDa), pure water permeation was 223L/m2hr, and the retention was 90% when feed solution was 1000ppm PVP 360kDa aqueous solution.
Effect of dope solution temperature on membrane structure and membrane formation was also discussed. Experimental result shows that when dope solution temperature was 50℃, membrane structure in cross-section was more inter-connected. It make pure water permeation increased from 223 L/m2hr to 572 L/m2hr and retention kept on 90% feed solution was 1000ppm PVP (MW=360kDa) aqueous solution. Result shows when dope solution temperature increased, it was favorable for solvent and non-solvent exchange. It means that dope solution pass through meta-stable region is faster. It is easy to produce spinodal decomposition and form inter-connected structure.
Furthermore, the resulted membrane was applied to MBR system. Transmembrane pressure (TMP) versus time and anti-fouling property was discussed. The result shows membrane which coated by anti-forming agent can improve anti-forming property. Then membrane operating time in MBR system was increased.
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