PRECIPITATION TANK

A precipitation tank in which raw water supplied to the lower part of the interior of a tank body from a center well 2 at the center part of the tank body 1 rises inside the tank body 1 and flows outas clear water from an overflow part at the upper part of the tank body 1, a plate 4 for changing the water flow direction being provided so as to face the lower end of the center well 2, wherein theprecipitation tank is characterized in being provided with a nozzle unit 5a for discharging blow water for sludge removal towards the vicinity of the center of the plate 4. 一种沉淀槽，其是使从槽体(1)的中央部的中心井(2)供给到该槽体内的下部的原水在该槽体(1)内上升并从该槽体(1)上部的溢流部成为澄清水流出的沉淀槽，并且该沉淀槽设有与该中心井(2)的下端对峙用于改变水的流动方向的托板(4)，其特征为，设有朝向该托板(4)的中央附近使污泥流走用的喷水吐出的喷嘴部(5a)。