| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To stably obtain a predetermined amount of permeated water at the time of filtration by automatically enabling the air vent of a permeated water lead-out pipeline along with backwashing at the time of backwashing when filtration and the backwashing due to the permeated water are repeated through the permeated water lead-out pipeline in an immersion type membrane separator. <P>SOLUTION: In the immersion membrane separation type sewage treatment apparatus equipped with an aeration tank 1, the immersion type membrane separator 3, the permeated water lead-out pipeline 7 which communicates with the permeation side of the separation membrane of the immersion type membrane separator 3 and guided to a treated water tank 6 and the pump 8 interposed on the way of the permeated water lead-out pipeline 7, an air vent valve device 100, which discharges the air in the permeated water lead-out pipeline 7 to the atmosphere at the time of backwashing in the immersion type membrane separator 3 and, prevents not only the leak of the backwashing permeated water but also the inflow of the permeated water at the time of filtration using the immersion type membrane separator 3 and the penetration of atmospheric air into the permeated water lead-out pipeline 7, is provided at the position between the immersion type membrane separator 3 in the permeated water lead-out pipeline 7 and the pump 8. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
