| 摘要 |
PURPOSE:To remove simultaneously, efficiently and biologically nitrogen and phosphorus in org. waste water to be admitted into aeration tanks by communicating and disposing the plural aeration tanks in such a way that the org. waste water therein moves in the state of plug flow. CONSTITUTION:The aeration tank 9 is segmented by a partition wall 10 having a notched bottom to the 1st layer 9a and the 2nd layer 9b. Both layers are communicated in the bottom. An air diffusing pipe 12 connected to a blower 5 is disposed in the bottom of the tank 9 and a settling and separating tank 6 is provided on the down stream side of the tank 9 to return part of the separated sludge to the waste water inlet of the tank 9. Simultaneous removal of nitrogen and phosphorus is efficiently executed by such compact device.
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