A Case for Low Return Sludge Flow Rates

A common problem encountered by traditional activated sludge systems involves failure to develop biomass that separates efficiently from the liquid, leaving behind a clear effluent that is low in BOD5 and suspended solids. Another problem is the bleed-through of ammonia due to low detention time in the aeration tank. Oftentimes, failure may be attributed to high return sludge flow rates (RSF) that...