Membrane bio-reactor system is used to purify both domestic and industrial wastewater to obtain quality water and to recycle this wastewater. Membrane bio-reactor systems are a technology that increases efficiency in wastewater treatment by combining membrane filtration systems and biological reactors. Since the effective pore size is generally below 0.1 μm, clean and significantly disinfected effluent is produced. The most commonly used membrane processes in the purification of water are; They can be listed as microfiltration, ultrafiltration, nanofiltration and reverse osmosis.