In a Membrane Bio Reactor a combination of a biological treatment process and a membrane filtration unit is used. The biological treatment process can be aerobe, anoxic or anaerobe. A MBR is suitable for the purification of industrial as well as communal wastewater.
In a conventional biological treatment system the wastewater is separated from the active sludge by a settler. In a Membrane Bio Reactor the separation takes place by membranes. Therefore substantially higher sludge concentrations (10 to 18 g/l) and smaller reactor volumes can be used compared to the conventional treatment systems.