This project belongs to the field of water pollution control in environmental engineering, suitable for the advanced treatment and reuse of wastewater from various industries. Water environmental pollution has become a bottleneck restricting the development of our society, and rapid urbanization is increasingly exacerbating the water resource crisis. The advanced treatment of urban wastewater, the treatment and resource utilization of leachate from garbage, and industrial wastewater from special industries can not only reduce pollutant discharge and protect the water environment but also achieve water resource conservation and alleviate the crisis. After more than a decade of systematic research, this project has taken membrane technologies such as microfiltration (MF), ultrafiltration (UF), nanofiltration (NF), and reverse osmosis (RO) as core treatment processes. Through the optimization of microbial community functions in biological treatment of various wastewater and process integration, it has achieved multiple innovative results: 1) The application of microarray technology in membrane bioreactors (MBR) Optimization research on the mixed liquor inside and microbial communities on the membrane surface has identified dominant bacterial groups that play an important role in pollutant removal. 2) Revealed the mechanism of microbial community quorum quenching to slow down MBR membrane pollution, using the quenching group effect to extend the membrane cleaning cycle and control membrane pollution; developed a MF-UF-RO-mixed bed combined process and achieved equipmentization, treating domestic sewage to meet the 'National Laboratory Water Standard' GB6682-92 and the 'National Electronic Grade Ultra-pure Water Standard' GB/T11446.1-1997. 3) Optimized the inverted A/A/O+MBR process and adopted a Swing reaction tank to optimize microbial functions and save gas supply; invented a lateral water distribution MBR; developed multi-stage multiple point reflux denitrification technology to ensure the denitrification and phosphorus removal effects of urban wastewater, achieving reduced operating energy consumption. 4) Developed UASB, Enhanced multi-stage A/O and MBR enrichment optimization microbial combination technology for treating leachate from waste incineration plants, fully leveraging the ability of microorganisms to remove pollutants, reducing the load on NF and RO systems, ensuring the normal production of the main project of the incineration plant. 5) Invented various pretreatment technologies for special pollutants, reducing the load on UF and RO combined technology for industrial wastewater treatment, achieving deep treatment and resource utilization of industrial wastewater. The project has obtained 15 invention patents, 9 utility model patents, published 89 academic papers, including 45 SCI-indexed articles; with a total of 910 citations, of which 650 were from SCI-source journals. Published in Environmental Science & Technology, Academic papers published in mainstream journals such as Bioresource Technology have received praise from scholars including internationally renowned expert Professor Yamamoto, and Environmental Science & Technology has reported on them in News. The achievements have been applied to wastewater treatment plants in 5 cities including Zhuzhou, Wuxi, Hefei, and Kunshan, treating 285 million tons of urban wastewater over three years, ensuring that the effluent meets the GB18918-2002 Class A discharge standards; they have been applied to 8 waste incineration plants, where the leachate from garbage is treated by a membrane combination process and either reused on-site or discharged to meet standards, ensuring the normal operation of the daily 7650 tons of garbage incineration project; they have also been applied to 4 industrial wastewater reuse projects, achieving high-quality reclaimed water quality standards. In three years, 83 million tons of industrial wastewater were treated, generating 62.38 million tons of high-quality recycled water. The total investment for the above projects was 3.429 billion yuan. In three years, new added output value reached 2.842 billion yuan, new added profit was 1.046 billion yuan, and new added tax revenue was 326 million yuan. The reduction in chemical oxygen demand (COD), biochemical oxygen demand (BOD), ammonia nitrogen, suspended solids (SS), total nitrogen (TN), and total phosphorus (TP) were 170,400 tons, 76,900 tons, 10,900 tons, 72,300 tons, 8,900 tons, and 1,100 tons respectively, achieving significant economic benefits, environmental benefits, and social benefits.