Mitsubishi Develops Compact Membrane BioreactorBy Engineering360 News Desk | March 25, 2016
Mitsubishi Electric Corporation has developed a compact membrane bioreactor (Eco-MBR) that recycles municipal and industrial wastewater with low-energy consumption and increases the quantity of permeated water per membrane filter surface area (flux) by cleaning the filter with ozonated water.
In conventional activated-sludge processes, treated water is separated from activated sludge by sedimentation, which requires a large surface area and produces water quality not suitable for reuse. In the case of conventional MBRs, a sodium hypochlorite solution is commonly used to clean the membrane filtration, but oxidation power is relatively weak so high flux is not possible. Also, the process requires a large number of membrane filters.
The Eco-MBR—which Mitsubishi Electric is jointly developing with Professor Hiroshi Nagaoka, of Tokyo City University’s Faculty of Engineering—achieves a high flux of 1.6 m3/m2/day and cuts the required number of membrane filters by intermittently cleaning the filters with ozonated water to efficiently remove organic substances for increased permeability. The Eco-MBR also features a compact footprint and reduces energy consumption by lowering the air flow rate that the blower uses to clean the membrane surface with bubbles.
Mitsubishi Electric says it expects to introduce the Eco-MBR into commercial use in municipal and industrial wastewater reuse systems in 2018.