Often operators increase MLVSS to decrease F/M to reduce aeration costs. Is this really what happens? Let's look at what happens biologically to derive an answer:
So what is the answer? Look at your system and biomass response to see the best MLVSS concentration for your waste stream. Increasing MLVSS to the far reaches of extended aeration reduces the oxygen consumption per individual bacterial cell but suspending the increased biomass and dealing with endogenous respiration oxygen demand cuts tends to consume the oxygen efficiency that was gained by moving to extended aeration.
Erik Rumbaugh has been involved in biological waste treatment for over 20 years. He has worked with industrial and municipal wastewater facilities to ensure optimal performance of their treatment systems. He is a founder of Aster Bio (www.asterbio.com) specializing in biological waste treatment.
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