Sizing activated sludge aerobic biological purification facilities

1 Sizing activated sludge aerobic biological purification facilities 

Aerobic biological purification is the only type of purification used in refineries, but petrochemical plants could, albeit rarely, use anaerobic purification by methanization. The general mechanisms, which are the same as for MWW, will not be discussed here but the sizing parameters should be understood. They are calculated based on the following data, as for ASP  

Mass of living matter in the reactor Ejn Mass of cells produced by the removed BOD5, L — Lf a Fraction of the BOD5 used to oxidize all the living matter a Fraction of the BOD5 used for bacterial synthesis 

It varies with the mass load applied to the reactor. 

Masse of living matter in the reactor Production of excess biomass per day 

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