| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an aeration tank structure which can carry out water purification without installing a special separator and the like for discharging suspended matter, and can be made to be simple and low-priced. <P>SOLUTION: In an aeration tank 2 comprising a first aeration tank 10 for aerating stored raw water and discharging it from a delivery port 16, and a second aeration tank 11 for aerating intermediate treated water flowing in from the first aeration tank 10 and discharging it from a delivery port 25 to outside, a return pipe 27 of which the suction port 30 opens adjacent to the tank bottom wall on the delivery port 25 side of the second aeration tank 11 is installed. The intermediate treated water of the second aeration tank 11 is returned to the first aeration tank 10 from the suction port 30 through the return pipe 27 to be purified. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
