| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the maintenance of and reduce the running cost of a flocculating settling apparatus by minimizing the wear of a discharge line in such a manner that an intermediate receiver is equipped in the discharge line, and that a low flow rate passage is set from a settling vessel to the intermediate receiver and a high flow rate passage from the intermediate receiver to a cyclone. SOLUTION: Suspended substances in raw water are flocculated as flocculated substances containing an inorganic fluocculant 6, a high molecular flocculant 8 and sand 9 in a flocculating vessel 2 equipped with an agitator 11 driven by a motor 10. The water to treat is introduced into a settling vessel 3 through a weir 12, and precipitates 13 are separated from the upper water to treat. A discharge line 18 which discharge the precipitates 13 and which separates into sludge 17 and the sand 9 by a cyclone 16, and which feeds back the sand 9, is connected with the bottom of the settling vessel 3. Then discharge line 18 is provided with an intermediate receiver 19 storing the precipitates 13. A low flow rate passage 20 is provided from the settling vessel 3 to the intermediate receiver 19, and a high flow rate passage 21 from the receiver 19 to the cyclone 16.
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