Mixing apparatus for crushing sludge

A mixing apparatus comprising:

• a chemical moving part configured to convey a chemical, the chemical moving part including an inlet and a discharge portion, the inlet at a first end portion of the chemical moving part and configured to receive the chemical from an external chemical feeder, the discharge portion at a second end portion of the chemical moving part opposite the first end portion and configured to output the chemical, at locations spaced apart along the second end portion, to a pipe;
• a motor configured to rotatably drive a shaft coupled to the motor at a first end of the shaft, the shaft defining a central rotational axis;
• a paddle connected to a second end of the shaft and configured to rotate with the shaft, the paddle including at least one projection extending in an outward direction from the central rotational axis of the shaft;
• and
• a plate configured to secure the motor to the pipe, the plate including a first side facing the motor and a second side, opposite the first side, facing the at least one projection of the paddle, the first side defining a first length extending in a direction perpendicular to the shaft and the second side defining a second length extending in a direction perpendicular to the shaft, the first length being greater than the second length.