Rapid stirring machine

A flocculating-mixing apparatus comprising:

• a slow stirring machine disposed on a rapid stirring machine, the rapid stirring machine including
• a tank for stirring sludge and flocculant,
• a drive shaft disposed in the tank, and
• a shearing stirring blade attached to the drive shaft,
• wherein:
• the tank of the rapid stirring machine is a cylinder that has an inside diameter smaller than an inside diameter of a tank of the slow stirring machine,
• a tank ceiling of the rapid stirring machine communicates with a tank bottom of the slow stirring machine through an opening that has a smaller diameter than the inside diameter of the tank of the rapid stirring machine,
• the stirring blade includes a shearing stirring blade,
• the shearing stirring blade has a rotating plate that integrally rotates with the drive shaft and the turbine blades that are disposed on the rotating plate,
• the turbine blades are disposed along a virtual circle centered around an axis of the drive shaft and at a location, on the rotating plate, in a region below the annular tank ceiling,
• the turbine blades being raised in an axial direction of the drive shaft and having a shape of a blade facing a rotation direction of the rotating plate, and
• the tank of the rapid stirring machine has a sludge inlet port protruding from an inner surface of the tank of the rapid stirring machine and facing the rotating plate.