Sequencing Batch Reactors (SBR) are a variation of the activated-sludge process. They differ from activated-sludge plants because they combine all of the treatment steps and processes into a single basin, or tank, whereas conventional facilities rely on multiple basins.

The operation of an SBR is based on a Fill-and-Draw principle, which consists of five steps—Fill, React, Settle, Decant, and Idle. These steps can be altered for different operational applications


Advantages of Sequencing Bath Reactors (SBR)

Smaller foot print -treatment takes place in a single basin instead of multiple basins.
The treatment cycle can be adjusted to undergo aerobic, anaerobic, and anoxic conditions in order to achieve biological nutrient removal, including nitrification, denitrification, and some phosphorus removal.
Older wastewater treatment facilities can be retrofitted to an SBR because the basins are already present.
Capable of handling wide swings in hydraulic and organic loadings.
Easier to control filamentous growth and settling problems.
Less equipment to maintain,Less operator attention,Greater operator flexibility
Biomass cannot be washed out,Bad settling can be recognized and corrected


Waste Water Treatment
Sewage Treatment