MBR is a new wastewater treatment technology, which combines biological treatment with membrane separation.
In conventional activated sludge processes, the separation of treated water from the sludge is mainly achieved by sedimentation in the secondary clarification tank. This requires a considerable amount of space and capital cost, and the separation efficiency is low.

Comparison between MBR & traditional AS process

Water index
SS (mg/L) CODcr(mg/L) BOD5(mg/L) NH3-N(mg/L)
Raw water - 300 500 300 40
MBR outlet <1 0 <20 <5 <1
AS process outlet <10 <15 <50 <10 <15
A common process flow of MBR

MBR reactor

Working principle internal MBR

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