How does a Sequencing Batch Reactor (SBR) work?

SBR is a fill-and-draw activated sludge system operating in cycles within a single tank. Phases: fill (wastewater added), react (aeration for biological treatment), settle (quiescent settling), draw (treated effluent removed), and idle (optional sludge wasting). Each cycle typically 4-8 hours. Advantages: flexibility in operation, good nutrient removal, no separate clarifier, handles variable flows. Suitable for small to medium flows. Multiple tanks operated in sequence provide continuous treatment capability.