Coal-based needle coke wastewater treatment system

According to the coal-based needle coke wastewater treatment system, a collision water distributor and a filler structure are arranged in an oil coarse graining separation device, when oil-containing wastewater flows through the collision water distributor, dispersed oil in the oil-containing wastewater can collide under the action of the collision water distributor to form oil drops, then the oil drops flow through the filler structure under the action of water flow lifting force, and the oil drops are separated from the filler structure. When the oil drops fall off from the filler, the dispersed oil drops are wetted and attached to the surface of the filler, so that the surface of the filler is completely surrounded by oil, then the flowing oil drops are more easily wetted and attached to the filler, the attached oil drops continuously coalesce and expand to finally form an oil film, and under the action of buoyancy and water impact force, the oil film falls off from the filler to form coarse-grained oil dr