| 摘要 |
<p>PURPOSE:To metabolize a fine particle-filled bed by pushing up fine particles with air through a center rising pipe provided in a treatment tank with the simultaneous separation of microbes sticking to fine particles and performing separation and removal of the separated microbes after precipitation of the fine particles to a filled bed. CONSTITUTION:Waste water to be treated is supplied from below a filled bed 2 of fine particles to which aerobic microbes stick and treated waste water is extracted from the top. The above process is performed by a treatment tank 1 which consists of components such as a center rising pipe 8 a charging layer 2 surrounding the former, and a statically placed separator 9. Below the rising pipe 8, an air injection pipe having a smaller cross section area than the inner cross-section area of the rising pipe is provided with its mouth opened upward, and a suspension of waste water and fine particles is allowed to rise mainly by an ejector action generated by air supply. Also in the statically placed separator 9, the fine particles are allowed to precipitate and fall on the upper surface of the filled bed 2. After this, a top suspension containing a microbe flock separated by friction wash in the pipe 8 is extracted out of the treatment tank 1 separately from the treated waste water, and the air change to the pipe 8 is adjusted for adjustment of a surplus sludge separation amount.</p> |
