The working principle of sewage mixer mainly includes the following aspects:

1. Motor drive: The sewage mixer mainly provides power through the motor to drive the mixing paddle to rotate. This is the basis of the mixer's work.

2. Rotating motion of the stirring paddle: the stirring paddle rotates under the drive of the motor, producing eddy current and shear force. This rotating motion can effectively disperse and suspend the solid particles in the sewage, increase its contact area with water, and thus improve the treatment effect.

3. Mixing and stirring: Through the rotation of the mixing paddle, the solid particles and suspended matter in the sewage are fully contacted and mixed with the water. This mixing not only helps to suspend solid particles and prevent them from settling at the bottom, but also ensures a uniform distribution of temperature, pH and other parameters throughout the treatment tank.

4. Improve the efficiency of oxygen transfer: The movement of the blender also helps to increase the transfer of oxygen in the water, which is essential to maintain the biological oxidation reaction in the sewage treatment process, because many microorganisms need oxygen to decompose organic matter.

To sum up, the sewage mixer uses the motor to drive the stirring paddle to rotate, and uses the eddy current and shear force generated by the stirring paddle to disperse and suspend the solid particles in the sewage, so as to achieve the full mixing and contact of the components in the sewage, thereby improving the efficiency of sewage treatment. At the same time, the movement of the mixer also helps to transfer oxygen and prevent the deposition of solid particles, ensuring the smooth progress of the sewage treatment process.