Abstract
We establish a Biological Oxygen Demand, BOD, model in a pure culture during growing phases. This model, exprimed in reduced coordinates, is used to do a methodologic study of the BOD measure on urban and industrial effluents and on river waters. The different types of curves observed are described using dimensionless numbers. We study the influence of the method used and of the initial concentration in present or introduce micro-organisms on the numerical value of result obtained for a limited period (5 days). We show that this model corresponds for weak values of the dimensionless number n, to the FAIR's model of first pseudo order. The dimensionless number n represent the ratio between the initial substrate concentration and the substrate equivalent of the biomass initially present.
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