| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a flocculation treatment method of water to be treated capable of reducing the inflow degree of the microflocs reaching a sand filtering bed while achieving the densification and miniaturization of microflocs and flocs in a state that the use amount of an inorganic flocculant is restricted by the drastic enhancement of the residual ratio (filtration ratio) of a contact material accumulation tank. Ž<P>SOLUTION: The contact material accumulation tank 12 is interposed between a microflocking step and a sand filtration step, and the inlet and/or the region in the vicinity of the inlet of the contact material accumulation tank 12 is filled with flocs with a particle size of 7.0 μm or above to set the residual ratio (filtration ratio) of the flocs with the particle size of 7.0 μm or above in the contact material accumulation tank 12 to 80% or above from the passing start stage of the water 1 to be treated. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
|
