Treated wastewater gravity feeds into the floatation tank, where the dosing system automatically adds flocculant into the incoming water pipe. The wastewater and flocculant are thoroughly mixed, initiating the flocculation process. The dosed wastewater and aeration water are then mixed within the pressure relief nozzle and enter the bottom of the floatation tank via the nozzle. They are distributed by the distributor and flow into the central barrel of the tank. Here, the suspended solids and oils in the wastewater, which have formed flocs due to flocculation, gradually grow larger and combine with bubbles released from the aeration water. Under the combined action of buoyancy and upward water flow, these large flocs rise to the surface and accumulate along the pool wall. A flat nozzle connected to a sludge pump, driven by the motor, slowly rotates along the pool wall, removing the floatable solids to the outside. The treated wastewater flows through the weir into the next treatment stage, with part of the effluent recycled as aeration water. The recycled water is transformed into aeration water within the pressure aeration tank using a German proprietary technology nozzle and compressed air, and then circulated for floatation treatment.