This dataset represents the treatment of wastewater generated by general transformation activities. The average COD content of domestic sewage in Bayannur City, Inner Mongolia Autonomous Region is 0.2973 kg/m3, and the BOD is 0.0951 kg/m3. The wastewater treatment process shares in this region are: BIOLAK 62.33%, A²/O 24.18%, MBR 5.27%, oxidation ditch 5.27%, Orbal oxidation ditch 2.95%.