Composite sedimentation device

The invention provides a composite sedimentation device which comprises a shell, an air guide assembly, an air grid cylinder and an exhaust fan, the shell comprises a supporting base and a cylinder body, an inertial rotation cavity is formed in the cylinder body, the axis of the inertial rotation cavity extends in the horizontal direction, and a water flow channel is formed in the cylinder wall of the cylinder body; a water spraying opening communicated with the water flow channel is formed in the inner circumferential wall of the cylinder body, the air guide assembly is arranged at the air inlet end of the inertial rotation cavity and comprises a plurality of blades, the blades are sequentially arranged with the axis of the inertial rotation cavity as the center, an air guide gap is formed between every two adjacent blades, and the axis of the air grid cylinder is parallel to the axis of the inertial rotation cavity; the air grid cylinder is installed on the cylinder body, an exhaust channel is arranged in t