COAGULATION-SEDIMENTATION APPARATUS

PROBLEM TO BE SOLVED: To provide a coagulation-sedimentation apparatus that increases uniformity of supply of water to be treated into a tank even in a large sedimentation tank and stably makes quality of the water to be treated satisfactory.SOLUTION: A coagulation-sedimentation apparatus includes: a chamber 12 which is installed in a sedimentation tank 10 and into which the water to be treated is introduced; a distributor 14 which is rotatably disposed at the lower end of the chamber 12 and has blow-off pipes 20A, 20B formed with blow-off ports blowing off the water to be treated downward in the sedimentation tank 10; and a plurality of baffle plates 16A, 16B which are rotated together with the distributor 14 and have stage faces. The blow-off pipe includes the first blow-off pipe 20A and second blow-off pipe 20B other than that including a rotary shaft 46 in the pipe, the baffle plate includes the first baffle plate 16A set under the first blow-off pipe 20A, and the second baffle plate 16B set under the second blow-off pipe 20B.