| 摘要 |
PROBLEM TO BE SOLVED: To hardly cause clogging due to the growth of microorganism with a simple constitution and to eliminate back washing operation. SOLUTION: In the culture tank, a microorganism colony 3 is precipitated at the lower end part of a reverse conical-shaped tank main body 1 whose bottom end is tapered, and the nozzle 4b provided at the lower end of the lowering pipe 4 driven rotatively around its axis in the tank main body 1 is immersed in the microorganism colony 3. Then the water in the tank main body 1 is pumped up by a returning flow passage 6 and supplied to the microorganism colony 3 from the header 4a provided at the upper end of the lowering pipe 4 while foaming to enable the purification of the water and the culture of the microorganism by dissolved oxygen.
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