Chapters 3 and 4 summarize the results from many scientists concerning different factors affecting nitrification and denitrification.

It is often difficult in practice to evaluate the relevance of the different results, and thus it is also difficult to select the appropriate results for the planning of a particular biological nitrogen removal unit. The authors therefore recommend considering as many as possible of the different results mentioned, for the case study at the planning stage of a particular plant.

For example, Sections 3.8 and 4.12 give an overview of the influence of temperature on nitrification and denitrification processes, and refer to the results of numerous investigators. The various equations proposed should be tried in turn to see how they fit the case study, in order to avoid dimensioning errors in the completed unit. This approach, in effect, brings a safety factor into the plant design.

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