Membrane bioreactor (MBR) is the combination of a membrane process like microfiltration or ultrafiltration with a suspended growth bioreactor, and is now widely used for municipal and industrial wastewater treatment.Hollow fiber membrane filter has a very high packing density because of the small strand diameter. There are some advantages: Lower energy cost , high quality effluent, lower footprint space, unbreakable hollow fiber, high flow rate, easy cleaning, easy operation.