Avaliação da qualidade da água do Rio Subaé

Abstract

The modern world is increasingly concerned about the quantity and quality of water resources remaining on planet Earth. Water is a necessary resource for the survival of humanity, largely required for domestic and industrial agricultural activities. These user sectors generate liquid and solid waste that are released directly or indirectly into water bodies, interfering with their quality. Of these, the first has the greatest interference since they constitute the main source of destination, whether treated or not. In Brazil, the degradation of water resources is a concern due to low rates of sewage collection and treatment. Thus, this work aimed to evaluate the quality of water in the Subaé River with data from analyzes carried out by INEMA, verifying whether or not the current quality is compatible with its framework. This analysis was carried out by obtaining water quality data from 4 (four) points of the aforementioned agency's monitoring network, located in the municipalities of Feira de Santana and Santo Amaro, in Bahia, made available on the MONITORA data platform. These data were collected and transformed into tables and graphs for analysis and interpretation of water quality based on CONAMA Resolution nº 357/05. Data from the Water Quality Index (IQA) and the Trophic State Index (IET) were also used to support the discussion. It was observed that points located in urban areas have water quality compromised by domestic and industrial sewage discharges, mainly at the collection point located in the municipality of Feira de Santana. During the period evaluated, collection point 1 had poor quality and at other points, water quality was classified as good. Regarding the degree of trophy, points 1 and 4 were presented as hypereutrophic and points 2 and 3 as eutrophic.