PURIFICATION PROCESSING DEVICE OF OIL-CONTAINING SEWAGE

摘要

There is disclosed a device for purifying oily wastewater, including a vertical tank of an atmospheric pressure, inside which a central coagulation reaction tube, a reverse 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, oily wastewater is sequentially subjected to a coagulation reaction, suspended sludge filtering and a purified water commutation process and then discharged, a sludge collecting groove collects and guides the suspended sludge to a sludge concentrating zone for further sedimentation and concentration processes and then discharges it to external to the tank, in this way, the purification reaction, flocculation and fine filtration of wastewater and the sludge concentration process are integrated within the same wastewater purifying device. Thus, the device is applicable to directly receive the produced water from oil well stations and treat it into water qualified for oilfield reinjection, and is equivalent to the existing wastewater pretreatment system plus a fine filtration system, thus avoiding the backwashing, supplement and replacement of filtering materials, so that the costs for operation are reduced while ensuring the water quality. The inventive device applies less restrict requirements on the quality of incoming water, and therefore may be widely used as the substitute for the three processes of coagulation, sedimentation or air flotation, and fine filtration during the treatment of various industrial wastewater and sanitary sewage.