Combined Kinetic Expression for the Denitrification Process

As for the nitrification process, a combined expression for the denitrifer growth jid and nitrate removal, taking some of the environmental factors into account, can be formulated.

Removal rates can be related to growth rates through equation (4.34).

Timmermanns and Van Hauten (1983) proposed an equation similar to (4.34), that also takes the influence of pH and temperature into account:

Figure 4.5 Determination of the growth rate |i at different pH values in a batch reactor at 25 °C. The biomass, X, is measured as a MLVSS concentration. After Timmermann and Van Hauten (1983).

Assuming zero order kinetics, the equation proposed by Timmermann etal. (1983) can be rewritten as:

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