The membrane-aerated biofilm reactor (MABR) is a relatively new technology for the biological treatment of wastewater. In the MABR system, air-filled, hydrophobic membranes are immersed in a wastewater to be treated. Bacterial cells attach to and grow on the membranes surfaces to form a membrane-aerated biofilm. Aerobic bacteria within the biofilm consume oxygen supplied by the membrane and nutrients within the bulk wastewater to satisfy their metabolic requirements. Because the membrane effectively separates the liquid and gas phases within a MABR, it can provide a significant energy savings over systems that rely on bubble aeration to supply oxygen for biological oxidation of wastewater.
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