Air-floatation oil removing sand setting device

The utility model relates to anair floatation oil removing sand setting device which comprises a water inlet pipe, a wastewater treating tank and a water outlet pipe. The wastewater treating tank sequentially comprises a sand collecting area, a sludge area, a mixing area and a separating area from bottom to top. The separating area comprises a water collecting area and an oil collecting area. An aeration disc is disposed between the sludge area and the mixing area. A water inlet branch pipe connected with a water inlet pipe is arranged above the aeration disc. A three-phase separator is disposed in the separating area. The three-phase separator comprises a guide plate and a triangular guide ring. The upper portion of the guide plate is of the same shape with the separating area. The lower portion of the guide plate is of a horn shape. An oil overflow weir connected with an oil outlet pipe is disposed on the upper portion of the guide plate outer wall. A water overflow weir connected with a water outlet pipe is disposed on the upper portion of the separating area outer wall. The air-floatation oil removing sand setting device is simple in structure, low in manufacturing cost, effective in treating wastewater containing oil and sands, suitable for treating of a large amount of wastewater and high in operation efficiency and has biochemical treatment capacity, and discharged water is low in oil content.