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This new type of wastewater treatment technology, which combines membrane separation technology and biotechnology, has a good quality of effluent, land occupation, and stable operation. It is one of the wastewater technologies most concerned in recent years. Membrane bioreactor technology can make the removal rate of major pollutants in sewage reach 90% or more, and there is no suspended matter in effluent, the turbidity is close to zero, the water quality is good and stable, and it can be directly reused.
Tsinghua University, the Chinese Academy of Sciences Ecological Environment Research Center, Tongji University and Beijing Bishuiyuan Science and Technology Co., Ltd., supported by the national “863†project, have achieved the engineering application of membrane-bioreactor technology after years of joint research. The project has developed three low-energy membrane-bioreactors with independent intellectual property rights (fluidized bed type, gas-lifted-cycle split type, plate type) and three different types of membrane module units.
Compared with the existing membrane-bioreactor, the running flux of low-energy membrane-bioreactor membrane has been significantly improved, reaching the advanced level of internationally renowned enterprises. In addition, the researchers also developed a series of key technologies for membrane fouling control: proposed operational models for economic aeration and sub-critical flux, and they have been well applied in different forms of membrane-bioreactors. Effective control of sludge deposition on the membrane surface; development of membrane filtration control technology for mixed liquids with coagulants and oxidants to extend the membrane operation cycle by two to four times; development of two membrane fouling systems suitable for different scales and automated operations On-line chemical cleaning mode has been applied in practical engineering.
The different membrane-bioreactor combination processes developed by researchers can meet the different requirements for the denitrification and dephosphorization of municipal wastewater, residential wastewater and bath wastewater reuse, hospital wastewater treatment, and industrial wastewater treatment such as printing and dyeing, and tobacco. Various wastewater treatment or reuse target requirements. Compared with the traditional activated sludge process, COD removal rate exceeds 90%, COD load rate increases 3 to 5 times, and floor space is reduced to 1/5 to 1/3.
With the maturity of technology, the project's industrialization process has been accelerating, product prices have fallen sharply, and the field of application has continued to expand. Old “nobility†products can already “fly into the homes of ordinary peopleâ€. The world's largest membrane bioreactor river water purification project has been applied to the Wenyu River Water Resources Utilization Project (100,000 tons/day) in Shunyi New City, Beijing, which has opened up a new situation for membrane treatment of municipal wastewater and wastewater. It is understood that the first large-scale urban sewage membrane bioreactor project in Asia with a daily processing capacity of 10,000 tons or more is located in Beijing Miyun Reclaimed Water Plant (45,000 tons/day), Huairou Reclaimed Water Plant (35,000 tons/day), and Wuxi Shuofang Wastewater Treatment Plant. Many large-scale wastewater reclamation projects such as the plant (20,000 tons/day) have also successfully applied this result.
At present, the research group has been granted 17 national invention patents, and the research results have been widely applied in the treatment and reuse of large-scale urban sewage treatment, residential domestic sewage, hospital sewage, and industrial wastewater. As of the end of 2008, it has been cumulatively processed. More than 230,000 cubic meters of water per day.
Membrane Bioreactor: Reproduce Clear Water Clear Wave
While the shortage of freshwater resources has constrained China’s economic development, the large amount of untreated wastewater has also brought enormous challenges to the environment. General water treatment technology can only meet the mid-water discharge standard, and a one-step integrated membrane bioreactor complete plant can not only achieve the transition from wastewater treatment to reclaimed water, but also has lower costs than seawater desalination and South-to-North Water Diversion. It makes sewage treatment not only an environmental protection industry that improves the water environment, but also an industry that provides clean water. This new low-energy membrane-bioreactor wastewater reutilization technology and engineering applications have also won the second prize for national science and technology progress.