Activated sludge systems use suspended natural biological and bacterial growth to remove contaminants by absorption and subsequent breakdown. Sequencing batch reactors (SBR) are a special form of activated sludge treatment in which all of the treatment processes take place in the reactor and clarifiers are not required. This process treats the wastewater in batch mode and each batch is sequenced through a series of treatment stages.
Sequencing batch reactors or sequential batch reactors, treat wastewater such as sewage in batches. Oxygen is bubbled through the wastewater to reduce both biochemical and chemical oxygen demand. In turn, this makes the effluent suitable for discharge to surface waters or for use on land.
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