In May 2015, baoding baojinneng sanitary products co., ltd. of hebei province reached a cooperation with our company. The treatment object of this project is domestic paper production wastewater. The total engineering design scale is 1000T/D, and this project adopts the "AO+MBR" treatment process. The original water quality is COD 100-120mg/L, BOD 20-30mg/L, and SS 100-150mg/L. After treatment, the effluent quality meets the first-grade A standard of pollution discharge standard for urban sewage treatment plant (gb18918-2002), and the water quality standard for the advanced wastewater treatment system of datang thermal power plant. The project includes the research and development, production, installation, commissioning and after-sales service of the sewage treatment system. In March 2019, the processing scale was expanded from 1000T/D to 2000T/D.