Estudo da autodepuração do rio vieira através da modelagem matemática

Abstract

This research presents the analysis of real auto-depuration of River Vieira, Montes Claros, Minas Gerais, and development of a mathematical optimization model that seeks to simulate scenarios and understand the behavior of it. Knowledge of the self-depuration is important because studies the resilience capacity of rivers to anthropogenic activities. The model is able to integrate different objectives and it has as central idea to minimize the cost for maintenance of the quality of the receiving body, without ceasing to seek maximizing of the improvement in terms of the parameters dissolved oxygen and biochemical oxygen demand. Model validation reduces costs and time in study and control of the quality of water bodies, since for this purpose would not be necessary collect in several stretches. The model allows to vary, as treatment efficiencies as flows of launch, what allow help the planning of collection and sewage treatment systems and seek greater fairness among users. With that, it lets find solutions that establish better compromise in attendance to existing purposes. The proposed model is valid for the situations tested, might serve to public administrators in decisions making and management of the river basin and of the water resources in focus. Important the comparison with current regulations, the actual data and the model was sufficient to verify if the effluent ejectment into the river are complying with the legislation. The use of mathematical modeling proved satisfactory in the evaluation of different management strategies, related to the classification of water bodies, considering aspects related to alternate efficiencies of effluent treatment, reducing costs and maintaining of adequate water quality in the receiving body.