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The influent COD of municipal wastewaters has been categorised into fractions: readily (soluble) and slowly (particulate) biodegradable, and soluble and particulate unbiodegradable. Procedures are presented for determining the division into these four categories, as are experimental methods for determining the maximum specific growth rate of the heterotrophs within the IAWPRC Task Group model structure. Some of the procedures are dependant on knowledge of the heterotroph yield and endogenous mass loss rate constants; comment is made on suggested values.

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Three biochemical models for biological excess phosphorus removal are critically analysed: the Comeau/Wentzel, Mino and modified Mino models. There is agreement between the models except in one respect, the generation of reducing equivalents (NADH2) required to convert acetate to poly-β-hydroxybutyrate under anaerobic conditions. In this regard a procedure is suggested to determine which of the models' premises are correct.

No abstract