MBR in Bangladesh is very popular in Waste Water Treatment System. Membrane Bioreactors (MBR) are treatment processes in a modern technology in waste water treatment, which integrate a perm-selective or semi-permeable membrane with a biological process. Membrane Bioreactors (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 with plant sizes up to 80’000 population equivalents (BEDDOW 2010). Due to it being a very technical solution; it needs expert design and skilled workers. Furthermore it is a costly but efficient treatment possibility. With the MBR technology, it is possible to upgrade old wastewater plants. So the demand of MBR in Bangladesh is growing up.