Avaliação da capacidade de autodepuração dos corpos d’água na área urbana de Caçapava do Sul

Abstract

In this work, the self-purification capacity of watercourses located in the urban area of the municipality of Caçapava do Sul, RS was evaluated. The assessment of the self-purification of water bodies makes it possible to present a diagnosis on the ability of the aquatic system to consume organic matter from the sewage discharged along the route. In this way, through laboratory analyzes of the upstream and downstream waters and based on indicators of water quality, together with the help of Streeter-Phelps modeling, it was possible to estimate the distance and time required for the waters of these water courses. recover the characteristics of their natural conditions and the critical stretches were identified in which they had the greatest impact on the aquatic environment. The averages of the pH, σ, OD, BOD, alkalinity, hardness and chloride parameters for the three watercourses fit into the water quality standards for class 2 or 3 water bodies. 'water showed an effective BOD(MO) depletion capacity during the course and the three watercourses showed an increase in DO levels. Therefore, this work can contribute to the generation of strategies that aim to protect aquatic ecosystems and improve water quality in the municipality of Caçapava do Sul.