Membrane Bio Reactor (MBR) is a biological process commonly used to remove soluble contaminants from wastewater, such as BOD (Biological Oxygen Demand) and COD (Chemical Oxygen Demand).

MBR technology involves an activated sludge process in a relatively compact reactor without any separate clarifier. In MBR technology, the membranes are submerged to filter out the mixed liquor, eliminating the need for clarification or settling and decanting.

MBRs are commonly used for sewage or industrial wastewater treatment and produce a very high quality effluent with low suspended solids (SS).

One of the limitations of MBRs is that unlike small ASR or SBR reactors, it is important to have effective fine screening prior to an MBR to remove any screenings from the wastewater/sewage.

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MBRs can be more compact than other biological treatment systems because they do not require a separate clarifier. Similarly, the MLSS (Mixed Liquor Suspended Solids) is generally higher in MBRs meaning the overall volume of the reactor can be smaller.

Quality Effluent

MBRs achieve very good quality effluent with low suspended solids. In addition to this, less disinfection is required as the membranes provide a partial barrier to pathogens.


MBR is a common, proven technology and can cater for a range of flowrates.