Process and device for treating comprehensive wastewater in coal chemical industry

The invention discloses a coal chemical comprehensive wastewater treatment process and device. High-ammonia-nitrogen industrial wastewater is treated by an SDN treatment unit, an AO-MBR treatment unit and an ozone oxidation unit in sequence; the SDN treatment unit is used for carrying out aerobic treatment after the wastewater is subjected to anoxic treatment, and then precipitating activated sludge; in the AO-MBR treatment unit, the wastewater is subjected to anoxic treatment and then subjected to MBR membrane treatment; and in the ozone oxidation unit, the wastewater is subjected to strong oxidation treatment by adopting ozone. According to the process and the device, the treatment process flow of SDN + AO-MBR + ozone oxidation is adopted, by controlling reaction parameters and utilizing a simple operation mode, the effluent meets the first-grade A emission standard in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant GB18918-2002, and the operation cost is low. The method is reasona