| 摘要 |
<p>PURPOSE:To increase an oxygen moving amount per unit time by respectively providing a primary air supplying air diffusion apparatus and a secondary air supplying air diffusion apparatus to the lower parts of the first and second water channels and controlling the fluidizing state or air bubble amount in a tank by adjusting the air diffusion amounts from said air diffusion apparatuses. CONSTITUTION:The waste water supplied into the first water channel 3 receives the aeration by a primary air supplying air diffusion apparatus 6 and rises in the first water channel 3 while comes into contact with a granular carrier having a biological membrane adhered thereto and reverses to fall in the second water channel 4. A secondary air supplying air diffusion apparatus 8 is also provided to the lower part of the second water channel 4 to aerate waste water with a controlled amount of air. Therefore, the flow velocity, fluidizing state of the granular carrier and air bubble amount in a tank are determined by the balance of the primary air amount of the primary air supplying air diffusion apparatus 6 and the secondary air amount of the secondary air supplying air diffusion apparatus 8. Therefore, a fluidized bed can be also formed to the second water channel 4 by the secondary air amount.</p> |
