PURPOSE: To obtain aseptic water sterilizable by a chemical agent, by treating water with a hollow fiber based on polyphenylene sulfide having fine piercing pores with a specific average pore size and a specific void ratio, specific membrane thickness, a hollow ratio and an outer diameter.
CONSTITUTION: Water is filtered by using a hollow fiber, which has fine piercing pores with an average pore size of 0.01W0.1μm and a void ratio of 10W85% and of which the membrane thickness is 5W200μm, the hollow ratio is 8W85% and the outer diameter is 30μmW5mm, to remove bacteria in water. For example, well water is precisely filtered by using a module (an available area of 1.2m2) of a microporous hollow fiber comprising polyphenylene sulfide with an average pore size of 0.061μm, a void ratio of 35%, a membrane thickness of 19μm, a hollow ratio of 64% and an outer diameter of 192μm under a pressure of 3kg/ cm2 toward the inside of the hollow fiber from the outside thereof. The amount of transmitted water after filtering over 5hr is 500l/m2.hr and a bacteria removal ratio measured by a direct microscopic examination method is 100%.
ANAZAWA TAKANORI
ONO YOSHIYUKI
DAINIPPON INK RIKAGAKU KENKUYS
| JPS57159587A | 1982-10-01 | |||
| JPS57171403A | 1982-10-22 | |||
| JPS5867733A | 1983-04-22 |
Next Patent: STERILIZED WATER AND METHOD AND DEVICE FOR FORMING STERILIZED AQUEOUS SOLUTION