Water Purification System Using Hydrophobic Membrane

To develop a new water purification system using a hydrophobic membrane, the membrane characteristics have been studied using basic equipment of 5l/h size. From results of the study, 100l/h size equipment was fabricated, and its characteristics were studied. The results are summarized as follows. The pore diameter of the PTFE membrane was optimized by waterproof pressure and mist separation characteristics, and a 0.1-0.2μm pore size membrane was selected for use in the system. Degassing by flash evaporation and oxidation by ultraviolet-rays were effective to decrease D.O. and T.O.C. to 1μg/l respectively. From these basic experiments, ultrapure water was able to be produced by the system. Water purity was characterized by a resistivity of over 18.2MΩ · cm, T.O.C. and D.O. of below 1.0μg/l and suspended particle of below 5units/ml. Finally, it was confirmed that the 100l/h size equipment could produce high purity water of similar purity to that of the small size equipment.