The 'sequencing batch reactor' (SBR) for wastewater treatment operates in:
Choose the correct answer
Continuous flow mode like conventional ASP
Time-based cycles (fill, react, settle, decant) in a single tank — no secondary clarifier needed
Only physical settling — no biological treatment
Gravity filtration only
Correct Answer
B. Time-based cycles (fill, react, settle, decant) in a single tank — no secondary clarifier needed
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SBR: a fill-and-draw activated sludge system operating in time-sequenced cycles: Fill (influent enters) → React (aeration for BOD removal) → Settle (sludge settles) → Decant (clear effluent withdrawn) → Idle. All in one tank. Advantages: flexible operation, no secondary clarifier needed, can achieve nitrification and denitrification. Used for small flows and intermittent industrial discharges.
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