In my experience, extended ...
Published by Matthew Crowhurst, Energy and Water industry Process and Project Professional
In my experience, extended aeration can be applied at lower loadings (0.05 KgBOD/m3/d). If the load is seasonal, it makes sense to use multiple trains to maintain optimum loading and minimise operational costs.
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F/M is the key parameter for operating any biological treatment. Hence if the F (food as kg/d BOD or COD) drops then also the M (micro-organisms as kg VS in bioreactor) shall be lowered by wasting more biosludge and vice versa.
The minimum F/M depends largely on the operating temperature and can be very low in winter conditions down to about 0.01 kg BOD/d / kg VS at 5°C.
Published by Bruno Peeters, managing director at Model Engineering