Análise da autodepuração no riacho caraibeirinhas através do modelo matemático de Streeter-Phelps

Abstract

Lately, one of the biggest problems faced in Brazil has been water resources management, given that in order to achieve economic development the society has used this resource in an abusive manner. The use of mathematical models to verify water bodies quality becomes an important tool to quantify their self-purification capacity. Therefore, this study analyzes the selfpurification capacity of the Caraibeirinhas stream, which has its source is located in the city of Delmiro Gouveia-AL. In addition, this stream receives domestic sewage along its course and flows out into Maxixe river. In order to achieve main goal of this study, four water quality parameters (pH, OD, COD, and BOD) were analyzed using the mathematical model proposed by Streeter-Phelps and comparing each of them with the standard parameters established by CONAMA Resolution no. 430/2011. The methodology was based on bibliographic research about water pollution and self-purification capacity, national and international self-purification experiments, a survey of existing legislation and research projects in the area. Our results shows that Caraibeirinhas stream has high concentrations of organic matter, which comes from the irregular launching of domestic sewage by the riverside community. In summary, we verified that the stream does not comply with the standards established by CONAMA Resolution no. 430/2011 for quality class 2.