This dataset represents the treatment of wastewater generated by general transformation activities. The average COD content of domestic sewage in Hinggan League, Inner Mongolia Autonomous Region is 0.2855 kg/m3, and the BOD is 0.1259 kg/m3. The wastewater treatment process shares in this region are: A/O 47.28%, BIOLAK 18.07%, modified SBR 17.53%, A²/O 9.92%, SBR 7.2%.