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What is MBR?

MBR (Membrane Bioreactor) is an advanced biological treatment system that combines the classic activated sludge process with membrane filtration technology. In this system, microorganisms in the biological reactor remove organic pollutants, while membranes physically separate suspended solids and microorganisms to produce high-quality effluent. Micro or ultrafiltration membranes are used instead of the settling tanks used in conventional systems.

What is Advantages of MBR

MBR technology offers many advantages in modern wastewater treatment applications:

  • High Treatment Efficiency: Provides very high efficiency (95–99%) in BOD, COD, TSS, and pathogen removal.
  • Compact Design: Since a settling tank is not required, the space requirement is 40–60% less than conventional systems.
  • High Biomass Concentration: Effective treatment can be achieved in shorter hydraulic retention times because the reactor operates at high MLSS (8,000–12,000 mg/L).
  • Excellent Effluent Water Quality: The effluent water is suitable for reuse (e.g., irrigation, industrial process water).
  • Low Sludge Production: The amount of excess sludge is reduced due to the long sludge age.
  • Full Automation and Stable Operation: It is easily controlled with online monitoring systems.

Areas of MBR Application

MBR systems are used in a wide variety of areas requiring high treatment quality:

  • Municipal wastewater
  • Residential areas
  • Small towns.
  • Hospitals
  • Tourist facilities
  • Military Bases

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Classification by System Configuration

Submerged (Immersed) MBR

  • Membranes are directly submerged in the bioreactor.
  • Operates under low transmembrane pressure (TMP).
  • Air scouring keeps the membrane surface clean.
  • Low energy demand, ideal for municipal and containerized systems.

Side-Stream (Pressurized) MBR

  • Membranes are located outside the reactor and fed under pressure.
  • Provides higher flux and operational flexibility.
  • Requires more pumping energy, typically used for industrial effluents.

Type of Membrane Bioreactors

Membrane types are produced in different ways depending on the material they are made of, the production method, and the pore size. With the development of new technologies every day, new models or application methods are emerging. Different membrane types are used depending on the application area and process.