Abstract
A model describing the nitrogen sub-system in a completely mixed and aerated pond is proposed. Inputs of nitrogen include feed and influent water; outputs of nitrogen include uptake by fish, removal of sediment from the pond and discharge water. Internal transformations between the inorganic and organic pools are also computed. The organic nitrogen that is introduced with the feed is mineralized through either ammonia excretion by fish or the microbial degradation of organic nitrogen. The opposite process—immobilization of nitrogen—occurs through algal nitrogen uptake or by microbial protein synthesis. Computed results may enable the design of an optimal water exchange rate. The simulation of ponds fed with different feed compositions and rates, having variable water exchange regimes, gave results close to the measured ones.
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