MBR building blocks
As with a conventional biological wastewater treatment process, an MBR is a combination of tanks, pipework, pumps and blowers, with the addition of the membrane differentiating it from classical processes.
A simple design of a small MBR has been provided by Lo et al (2015). This is a general design for a municipal wastewater treatment based on an immersed membrane and an MLE (modified Ludzack−Ettinger) process. The specifications of the individual pieces of equipment (power, flow and/or pressure ratings) then depend on the application and assumptions made.
Most MBR installations must also include a control system for regulating flows and pressures.
|Tanks||Raw water||T1||Storage tank for inlet wastewater|
|Primary sedimentation||T2||Removal of gross, settleable solids|
|Equalisation (EQ)||T3||Equalisation of flow|
|Aeration (Ae)||T5||Nitrification and biological oxidation|
|Treated water||T7||Storage of permeate water|
|Sludge||T8||Storage of wasted sludge|
|Chemicals storage||T9, T10|
|Pumps||Settled sludge transfer||P1||Submerged, settled sludge to sludge storage tank|
|Feed||P2||EQ tank through rotary screen|
|Permeate||P3||Self-priming, membrane suction filtration|
|Sludge return/discharge||P4||Submerged, sludge recirculation and excess|
|Sludge transfer||P5||WAS to dewatering|
|Chemicals||P6, P7||Cleaning chemicals transfer to membrane, x2|
|Blower||Process||B1||Biological process aeration|
|Mixer||EQ tank mixer||X1||High speed, equalisation tank|
|Ax tank mixer||X2||Low speed, anoxic tank|
|Screen||Rotary screen||S1||Fine screening of feed|
|Membrane||Membrane module||M1||FS membrane plus frame with built-in aerator|
|Diffusers||Fine bubble diffuser||D1||Process aeration|
|Coarse bubble diffuser||D2||Membrane aeration|
© Text and image copyright Judd & Judd Ltd
Lo, C.-H., McAdam, E., and Judd, S. (2015). The cost of a small membrane bioreactor, Water Sci Technol 72(10) 1739−1746.
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