The MBR membrane-bioreactor (MBR BIO-REACTOR, MBR) is a novel wastewater treatment system that organically combines membrane separation technology with biological treatment techniques. By replacing the conventional two-stage pond at the end of existing biological treatment processes with membrane modules, the system maintains a high concentration of activated sludge within the bioreactor, enhancing the organic loading capacity of the biological treatment. This approach not only reduces the footprint of wastewater treatment facilities but also helps sustain a low sludge load, ultimately minimizing the volume of excess sludge generated.

　　Primarily utilizing membrane separation equipment immersed in an aerobic biological community, the system effectively retains activated sludge and high-molecular organic matter within the reactor tank. As a result, the mixed liquor suspended solids (MLSS) concentration in the membrane bioreactor system can be increased to over 8,000 to 10,000 mg/L, while the sludge retention time (SRT) can be extended to more than 30 days.

　　The MBR membrane bioreactor features an effective blocking mechanism that allows the retention of microorganisms with long generation cycles, enabling thorough wastewater purification. Meanwhile, nitrifying bacteria can proliferate fully within the system, delivering significantly improved nitrification performance and creating opportunities for advanced phosphorus removal.

　　What are the technical advantages of MBR membranes?

　　High-MLSS filtration combined with microfiltration membranes ensures stable, high-quality water. Under high-volume loads, the process boasts a short retention time, making the MBR system simpler than conventional setups while significantly reducing the required footprint—allowing it to completely replace sedimentation tanks and sand filtration units. Additionally, the installation area is 30% smaller compared to traditional methods, though it still faces challenges related to sludge settling.

　　The MLSS concentration in the reactor reached over 10,000 mg/L, demonstrating strong internal backwashing capability and effectively handling high-concentration organic wastewater. During microfiltration membrane filtration, the separation performance significantly outperformed conventional treatment units such as traditional sedimentation tanks and sand filters, resulting in excellent effluent quality with low levels of suspended solids and turbidity. Typically, after treating low-pollution municipal wastewater, the treated water can be directly reused as reclaimed water or recycled on-site for resource recovery purposes. This process also promotes the interception, growth, and proliferation of slow-growing nitrifying bacteria, enhancing the overall nitrification efficiency of the system. Additionally, the A/O and A2O processes exhibit robust denitrification capabilities, enabling efficient removal of ammonia nitrogen and phosphorus—making them particularly well-suited for use in areas subject to stringent water-quality regulations.

　　Microfiltration membranes can effectively block most bacteria and other microorganisms, reducing the need for disinfectant additives while ensuring safe reclaimed water. The system boasts low energy consumption and minimal operational costs. Additionally, by retaining biomass in the pond, it achieves a longer sludge retention time (SRT), resulting in a sludge age that is more than half as long as under conventional methods. This leads to significantly lower excess sludge production compared to traditional activated sludge processes, with extended aeration cycles and greater operational flexibility. The biofilm-based tubular system combines filtration characteristics with high mixed liquor suspended solids (MLSS) concentrations, making it particularly effective at treating wastewater with widely varying pollutant loads. The system features PLC-controlled operation for ease of maintenance and user-friendly automation, allowing for straightforward management of biological sludge concentrations. With MLSS levels ranging from 6,000 to 10,000 mg/L, the system minimizes the footprint of the aerobic bioreactor tank, enabling compact, closed-loop designs that produce minimal pollution, low noise levels, and reduced odor emissions.

　　Membrane separation significantly enhances the efficiency of treating hard-to-degrade, high-molecular-weight substances in wastewater. The standard mobile modular design allows for quick and easy installation, as well as seamless phased expansion—making it ideal for retrofitting existing wastewater treatment plants, simply by adding MBR membrane system equipment.

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