This tremendously limits the collection and utilization of PSB. The traditional method for PSB collection is coagulation. But the collected PSB biomass becomes unsuitable for utilization because the coagulant pollutes the biomass. Ultra-filtration membrane separation is well known for its excellent retention of particles of micron size range [18]. Therefore, ultra-filtration membrane was introduced into the PSB wastewater treatment system to separate PSB effectively and to further purify the effluent. Thus, a novel PSB-MBR was constructed for simultaneous treatment of wastewater and recovery of biomass.