Energy Efficient MBR Process

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Abstract:

Due to the small footprint and superior effluent quality, the number of membrane bioreactors (MBRs) used in wastewater treatment is increasing. The higher energy demand of MBRs compared to the conventional activated sludge process (CASP), however, is an often discussed drawback.

It is shown, that in optimized municipal MBRs only about 12 % of the total energy consumption is used for process aeration and the majority of about 65 % for aeration systems in order to control fouling of the membrane surface (air scouring). The rest goes into pre-treatment, mixing and pumping. The energy optimized MBR process can be achieved with an installation of the membranes directly into the aerobic part of the aeration tank. Additionally the PLC must be adapted to a high flux operation. With the new mechanical cleaning process the flux can be also be increased. Taking all optimizations together the energy optimized MBR process can be operated at about 0.5 kWh/m3 and is in the same range compared to conventional systems. This paper gives a theoretical approach to an energy optimized MBR process.

Keywords: MBR; air scouring; energy demand; mechanical cleaning; oxygen transfer

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864710798216945

Publication date: January 1, 2010

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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