MBR combines conventional biological activated sludge processes with membrane filtration. The system consists of a porous polymeric flat-sheet ultrafiltration (UF) membrane with a nominal pore size of 0.038μm, effectively retaining contaminants particles and dangerous pathogens and making it a class high-quality effluent water. 

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Step by Step:

First, raw wastewater is pumped through a debris fine screening prior entering the MBR system.

After the wastewater mixing and aeration process, liquor passes through the MBR Ultra filtration system.

Feed stream (influent) mixed liquor is divided into two streams.

Retentate, which contains the concentrated solution (biological activated sludge) 
Permeate, which passes the membrane (clean water recycled to the quality specified)
Each membrane unit/module acts as contaminants’ barrier
Retains and eliminates fine particles including dissolved, dispersed and/or suspended matter.
MBR are fine permeable (porous) layers with thickness range of 0.038μm, their separation/elimination action is based on several layers with defined pore sizes. Particles and molecules of suspended solids, bacteria and viruses, which are larger than the maximum pore size of the membranes, are retained completely.
The driving force for membrane-based separation is the pressure difference (transmembrane pressure) between the feed side and the permeate side.
Biomass degradation generated by air diffusers located at the bottom of membrane modules. 
Self-cleaning shear force is created by the flow of air across the membranes, limiting build-up on the membrane surface.