Coal-containing wastewater treatment system

The utility model provides a coal-containing wastewater treatment system. The coal-containing wastewater treatment system comprises a pre-sedimentation tank, a wastewater adjusting tank, a membrane filter and a cleaning device which are connected in sequence, and a filter bag is arranged in the membrane filter. The treatment system disclosed by the utility model is wide in filtering range, solids in filtered liquid can be effectively removed from 20 ppm to 10000 ppm, and the filtrate is clear; the membrane filter performs low-pressure filtration under the operation pressure of 0.07-0.1 MPa, so that the filtration resistance is small, and the operation energy consumption is low; the membrane filter has the characteristics of automatic reverse cleaning and continuous filtration, the filter membrane can be subjected to automatic reverse cleaning in a short time (several seconds), and the filter does not need to be emptied during reverse cleaning; moreover, the system is compact in arrangement, small in equipment