| 摘要 |
<p>PROBLEM TO BE SOLVED: To uniformly distribute a microorganism immobilizing carrier in a tank. SOLUTION: The microorganism immobilizing carrier 11 is held in fluid state at an inside of an aerobic tank 3, and a carrier separating screen 12 forming a separated water passage 13 between a wall surface of the tank is provided at an upstream side position of a flow out end part tank wall being the flow out end of the aerobic tank 3. Then a parting wall 14 in the tank forming an upward passage 16 communicated with a basin in the tank at a bottom end opening of a bottom part side of the tank between a screen surface is provided at the upstream side position of the carrier separating screen 12, and an air diffusing device 17 is provided at a bottom part of the upward passage 16, and a carrier circulation flow passage 18 is provided by communicating a tank upper part side of the upward passage 16 and a flow in end side of the aerobic tank 3.</p> |
