Patent ID: 8828224

Claim:
A device for purifying oily wastewater, comprising a vertical tank of an atmospheric pressure, inside which a central coagulation reaction tube, a cone-shaped cyclone flocculation stage, a suspended sludge filtering zone and a purified water commutation stage of inclined plates are included from bottom to top sequentially, the central coagulation reaction tube is provided with a wastewater inlet at a bottom of the central coagulation reaction tube along a tangent direction, a weir plate is arranged peripherally around the suspended sludge filtering zone, thereby forming a sludge collecting groove between the weir plate and a wall of the vertical tank, wherein the sludge collecting groove is in communication with a sludge concentrating zone via a sludge overflow pipe, the sludge concentrating zone is connected to a sludge discharging pipe, and a weir plate is arranged above the purified water commutation stage of inclined plates along a wall of the vertical tank and forms a purified water outlet which is connected to a water outlet pipe.