Effects of the Membrane Materials on the Filtration Characteristic in the Membrane Separation-activated Sludge Process

막 재질에 따른 막분리활성오니법의 여과 특성

By checking the variations of the raw water quality and MLSS, the effects of the membrane materials on permeable flux and quality of the treated water were investigated in this study. Due to the stability for high variations of MLSS, tubular type membranes were selected. Polysulfone group membranes and polyamide group membranes were tested. The crossflow operation mode was adapted, because membrane fouling problems could be easily controlled by adjusting the linear velocity. Due to the high concentration of the raw water, polyamide group membranes were originally expected to achieve two times higher permeable fluxes. However, difference was only approximately $20l/m^2{\cdot}h$ at $3kgf/cm^2$. It might be resulted from the high concentration of organic materials in the effluent of the RBC process. For the quality of the treated water, polyamide group membranes were slightly less effective. It might be resulted from the fact that polysulfone group membranes had more adsorptive capacities for the organic materials. The effects of temperature on the permeable flux were found to be significant. Despite of the irregular injection of raw water, the quality of the treated water was kept stable.