| 摘要 |
PROBLEM TO BE SOLVED: To provide a water cleaning method which provides an excellent turbidity removing effect even at the time of low turbidity when a polymeric flocculant is used, eliminating the problem of over-blocking generable when the polymeric flocculant is used and enabling stable water cleaning treatment, and an apparatus therefor. SOLUTION: An inorganic flocculant is injected in raw water and the polymeric flocculant is succeedingly injected therein to perform flocculation and sedimentation treatment, and filter treatment is subsequently performed. In this water cleaning treatment method, the drift current of flocs after the injection of the polymeric flocculant is measured and the injection amount of the polymeric flocculant is controlled on the basis of the measured result. In this water cleaning treatment method, flocs formed by flocculation and sedimentation treatment is returned. The water cleaning treatment apparatus is also disclosed. COPYRIGHT: (C)2004,JPO
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