MBR-technology has become a standard technology for waste-water treatment. Worldwide more than 5000 MBR plants are under operation. Most of them are quite small plants but more and bigger plants are under construction. The investment costs can be compared with conventional plants in case that the effluent requirements are the same. But MBR technology has further advantages. In this paper, the benefits of MPE technology at some full-scale MBR plants are shown. These results will be used to demonstrate the possibility CAPEX and OPEX savings that can occur if new MBRs are designed with MPE-technology. (C) 2009 Published by Elsevier B.V.