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MBBR Design Parameters

Application Substrate Removal flux,g/m2·d Volumetric removal rate,kg/m3·d
BOD removal, partial BOD 15-20 4.5-6.0
Secondary treatment BOD 5-15 1.7-5.0
Prenitrification BOD 4-5 1.2-1.5
Nitrification NH4-N 0.4-1.4 0.1-0.4
Predenitrification NO3-N 0.20-1.0 0.1-0.3
Postdenitrification NO3-N 1.0-2.0 0.3-0.6

Data source:Wastewater Engineering 5th p.1020


The various application scenarios for the parameters listed in the table are as follows:

  • 1.BOD removal, partial:
    When used in the pretreatment of other biological treatment technologies, MBBR can be designed to operate under extremely high organic loading, which can remove a large amount of BOD (Biochemical Oxygen Demand) within a small space, thereby reducing the burden on subsequent systems. Nevertheless, the BOD removal rate of MBBR is only about 60-70% during high-load operation.
  • 2.Prenitrification:
    Nitrification needs to be at very low concentrations of BOD to achieve a better effect. Therefore, if MBBR is applied to the BOD removal before the nitrification tank, it can be operated under lower area loading.
  • 3.Predenitrification:
    These are the design values that use the BOD in the influent wastewater as the carbon source required for denitrification in the A/O process.
  • 4.Postdenitrification:
    These are the design values that use additional organic matters as the carbon source required for denitrification in the reaction tank after nitrification.

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