Application of hollow fiber ultrafiltration membrane in water treatment

In order to test the performance of different hollow fiber ultrafiltration membranes in waste water treatment,three kinds of hollow fiber ultrafiltration membranes of PES,PP,and PAN,were used in filtering of tap water and waste water.The change of color,turbidity,pH value,ammonia nitrogen content,COD and water flow before and after filtration were evaluated.Scanning electron microscopy(SEM) was used to observe the micromophology of the surface and cross-section of the above three membranes before and after filtration.The result indicated that PES showed the highest comprehensive performance.The removal of ammonia nitrogen and COD of all the three membranes was limited,so that secondary or triple filtration should be adopted for raising the filtration efficacy.The morphological analysis showed that the finger-like structure has better antifouling performance than the pore-like one.