| 摘要 |
PURPOSE: To carry out fermentation and cultivation in a bio-plant for a long time by performing a filtration to remove germ by allowing a highly humid gas to pass through a germ removing filter having a hydrophobic polymer membrane as its filter medium while continuously removing, from the membrane surface, water drain generating on the surface of the primary side of the hydrophobic polymer membrane. CONSTITUTION: A gas source (1), a gas-liquid contact apparatus (2) and a germ removing filter apparatus (3B) having a hydrophobic polymer membrane as its filter medium are so arranged that a gas from the gas source passes through the germ removing filter apparatus after increasing its humidity by contact with water in the gas-liquid contact apparatus. In the germ removing filter apparatus, water drain generated on the surface of the primary side of the hydrophobic polymer membrane is removed immediately flowing down without staying on the membrane surface. |
