Abstract
Rational and empirical models of ammonia nitrogen and total Kjeldahl nitrogen (TKN) removals were evaluated as a means of developing design relationships that can be used to estimate nitrogen removal in aerated wastewater lagoons. Plug flow, complete mix and dispersed flow hydraulic models were evaluated in conjunction with Monod growth kinetics, first order kinetics, and multiple substrate limiting relations. Polynomial equations, and multiple regression analyses were also tried. Combinations of the models were evaluated using field data from five aerated lagoon systems operating in various geographical areas of the USA. Only the plug flow model, assuming first order kinetics, of the classical approaches to biological modeling produced satisfactory results. Because of the simplicity of the plug flow model and a model based on the relationship between the fraction of nitrogen removed and the hydraulic detention time, it was recommended that these two equations be used to estimate nitrogen removal in aerated lagoons.
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