Treatment process: according to the water quality, the following treatment processes are adopted for various wastewater 1. For emulsion wastewater, oil separation sediment + flocculation demulsification + pressurized dissolved air flotation (the effluent is sent to the comprehensive wastewater treatment system) 2. Oil separation sediment + hydrolytic acidification + contact oxidation + inclined tube deep sedimentation are selected for oily comprehensive wastewater 3. Filter + adsorb + disinfect the reuse water