| 摘要 |
<p>PURPOSE:To ensure that stirring and aerating water is performed uniformly even upto the bottom of a tank in a desired manner by supplying oxygen and carrying out stable mixing/stirring even in the deep tank. CONSTITUTION:A draft tube 2 is arranged in the center of a deep layer aeration tank 1 to conduct a fouled water from the top to the bottom of the tank. In addition, a communication tank 3 is arranged on the external periphery of the deep layer aeration tank 1, and the fouled water is scooped out to the top of the draft tube 2 in the aeration tank 1 from the inner bottom of the communication tank 3. Further, an ascending circulation water flow through the draft tube 2 from the bottom of the aeration tank 1 to the outer top of the tube, is generated using a water level difference generated between the communication tank 3 and the draft tube 2. Thus, a turning water stream is generated with the concurrent aeration by a self-aspiration type screw aerator 4 arranged at the inner top of the draft tube 2. Uniform and efficient aeration and stirring is performed across the entire tank.</p> |
