| 摘要 |
<p>PURPOSE:To prevent the trouble of an installation by providing a ceramic filter to the upper part of a fluidized bed of microorganism in a reaction tank for microorganism and forming a semifluidized bed of a carrier stuck with microorganism to the installation region of the ceramic filter. CONSTITUTION:Water to be treated which is fed through a raw water feed path 1 and a circulation path 9 is dispersed by a perforated planar material 13 and jetted upward in a reaction tank 2. Carriers 12 stuck with microorganism are fluidized by the water to be treated and a fluidized bed 12A of microorganism is formed in the reaction tank 2. A semifluidized bed 12B of the carriers 12 is formed in the installation region of a ceramic filter 5 by means of the fluid limiting action for the carriers due to the ceramic filter 5. The water incorporated in the reaction tank 2 is subjected to purification treatment by microorganism stuck on the carriers 12 in the anaerobic atmosphere. Thereby high-degree purification treatment by the ceramic filter is enabled.</p> |
