A Study of the Transformation of Chemical Compounds and Biochemical Oxygen Consumption Dynamics in the Chemical and Ecological Water Quality Simulation

Leonov, A.V. (1978). A Study of the Transformation of Chemical Compounds and Biochemical Oxygen Consumption Dynamics in the Chemical and Ecological Water Quality Simulation. IIASA Professional Paper. IIASA, Laxenburg, Austria: PP-78-004

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Abstract

This report includes information about mathematical models of biogenic compound transformations and biochemical oxygen consumption (BOC). These models were constructed in the State Oceanographic Institute (Moscow, USSR). Mathematical models of the nitrogen and phosphorus compound transformation and BOC are presented in this report. These models attempt to give a detailed description of the complex processes, including physical and chemical reactions and biochemical interactions, that determine the transformation rates of chemical compounds and oxygen consumption in different water solutions. The main attention was given to the representation of the experimental observations in a batch microsystem because this stage is necessary for intelligent mathematical modelling of the biochemical transformation processes in natural conditions to characterize the water quality. The published experimental data for batch systems were used to identify the rate constants at separate stages and to reconstruct the dynamics of organic, mineral biogenic compounds, biomasses and to estimate the BOC both at individual stages and as a whole. The models can satisfactorily reflect the transformation dynamics of chemical compounds, microorganisms and oxygen consumption in different water solutions (lake and sea water and sewage). The simulations have showed that despite all the difficulties in descriptions of chemical matter transformation there are a definite number of main elements and they are quite enough for the detailed mathematical simulations of water system behavior and for the prediction of some essential peculiarities of ecosystems important for water quality characterization. The given models may be used as ready blocks connected with the corresponding hydrophysical blocks during model construction for research of the natural water chemical-ecological system.

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