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Why does a complete mix activated sludge reactor with a high value of Θc produce less...

Why does a complete mix activated sludge reactor with a high value of Θc produce less biomass than a reactor with a low value of Θc?

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Answer #1

In a Complete Mixed Activated Sludge(CMAS) reactor, stirring is done in a uniform manner. So there is not much difference between the effluent and aeration tank contents. here c is the mean cell residence time. It is the average time the sludge remains in the reactor.

c is one of the initial parameters that is assumed which lies between 5 - 10 days. if the value is greater then nitrification is done and regarded as a necessary step as the nitrogen content in such waste is more. But the motive is to have a low F/M ratio. Recycling the sludge increases the c and sufficient concentration of biomass is also maintained.

c = mass of organism in the aeration tank / mass of organism removed

if MCRT increases then due to recycling, the biomass in the aeration tank will gradually be increasing but biomass removed decreases. Thus they are wasted before they reproduce.

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