Membrane Biological Reactor

• It consist of biological reactor (bio reactor) with Suspended Biomass and Solids separated by Micro filtration membranes with nominal pore sizes ranging from 0.1 to 0.4 µm,are finding many applications in Waste water treatment.
• This may be used with aerobic or anaerobic suspended growth bioreactors to separate treated wastewater from the active biomass.
• The concept of the MBR system consists of utilizing a bioreactor and micro filtration as one unit process for waste water treatment thereby replacing, and in some cases supplementing, the solids separation function of the secondary clarification and effluent filtration.

The ability to eliminate secondary clarification and operate at higher MLSS concentrations provides the following advantages:

• Higher volumetric loading rates and thus shorter reactor hydraulic retention times.
• Longer SRTs resulting in less sludge production.
• Operation at low dissolved oxygen concentrations with potential for simultaneous nitrification – denitrification in the long SRT designs.
• High – Quality effluent in terms of low turbidity, bacteria, TSS, and BOD.
• Less space required for the waste water treatment.