Device for removing COD (Chemical Oxygen Demand) in coking wastewater

The invention provides a device for removing COD in coking wastewater, and relates to the technical field of chemical engineering, the device comprises a raw water treatment tank and a sedimentation tank arranged on one side of the raw water treatment tank, a grating assembly is arranged in the raw water treatment tank, and a filter assembly is arranged on the sedimentation tank. Through the arrangement of the filtering assembly, the sludge discharging assembly, the lifting pump set and the grating assembly, water floccules are isolated, so that the possibility of secondary pollution of treated wastewater is reduced, a large amount of deposited sludge generated by accumulation of the floccules is effectively discharged, blockage caused by accumulation of the sludge is avoided, and the service life of the wastewater is prolonged. The problems that in the prior art, the operation cost is high, the treatment efficiency is low, secondary pollution of treated wastewater is easily caused by floccules generated by r