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The membrane bioreactor (MBR) is a novel wastewater treatment system that organically combines membrane separation technology with biological treatment technology. Membrane modules replace the secondary settling tank at the end of traditional biological treatment technology, maintaining high activated sludge concentrations within the bioreactor and increasing the organic load of biological treatment. This reduces the wastewater treatment facility footprint and reduces excess sludge by keeping the sludge load low. The system primarily utilizes activated sludge and macromolecular organic matter trapped within the retention tank of the membrane separation equipment immersed in the aerobic biotank. The activated sludge (MLSS) concentration within the MBR system can be increased to 8,000-10,000 mg/L, or even higher, and the sludge age (SRT) can be extended to over 30 days.Membrane bioreactor can retain microorganisms with a long generation cycle due to its effective interception effect, which can achieve deep purification of sewage. At the same time, nitrifying bacteria can fully reproduce in the system, and its nitrification effect is obvious, providing the possibility of deep phosphorus and nitrogen removal.
