Membrane Bio Rector (MBR) is the combination of membrane process like microfiltration or ultra filtration with suspended growth bioreactor. This very compact arrangement produce a MF/UF quality effluent suitable for reuse applications or as a high quality feed water source for Reverse Osmosis treatment. In MBR system the wastewater is brought in contact with the biomass and then under pressure, filtration through the membrane. The entire biomass is returned to the bioreactor. Excess sludge is pumped out order to maintain a constant sludge age and the membrane is regularly cleaned by backwashing, chemical washing or both. The entire biomass is confined within the system, providing both perfect control of the residence time for the microorganism in the reactor (sludge age) and the disinfection of the effluent.