| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an operation method of a membrane separation type activated sludge treatment apparatus which can maintain activated sludge in a good condition even during a time period when the operation of a membrane unit is stopped, and consumes a small amount of operation power for diffusion. <P>SOLUTION: In the operation method of the membrane separation type activated sludge treatment apparatus having a treatment tank 16 for aerobically treating water to be treated by the activated sludge held in the tank, the membrane unit 20 immersed in the treatment tank 16, a coarse bubble diffusion means 22 disposed below the membrane unit 20, a fine bubble diffusion means 24 disposed in the treatment tank 16, and a suction pump 30 for discharging treated water permeating the membrane unit 20 to the outside of the apparatus, only one of the coarse bubble diffusion means 22 and the fine bubble diffusion means 24 is operated intermittently and the diffusion by the other of them is stopped during a time period when the operation of the membrane unit 20 is stopped by stopping the drive of the suction pump 30. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
