| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for treating waste water, in which the filtration capacity (a water permeation speed) of the filtration membrane is increased by improving a method for operating a filtration membrane. SOLUTION: The method for treating waste water, in which a waste water treatment apparatus provided with: a treatment tank having the filtration membrane and an air diffusion pipe; and a flocculant throwing means for throwing a flocculant in the treatment tank is used to perform flocculation, filtration and back pressure washing, comprises a step of: removing a suspended component from the lower part of the treatment tank after air diffusion from the air diffusion pipe is stopped during the time to operate the filtration membrane or during the time to subject the filtration membrane to back pressure washing. COPYRIGHT: (C)2007,JPO&INPIT
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