Análise dos indicadores de qualidade da água do Rio Ligeiro no perímetro urbano de Pato Branco - PR

Abstract

The objectives of this research was to obtain the Water Quality Index (WQI) of the Ligeiro River on the urban perimeter of Pato Branco, and analyze the values obtained on the sampling and check if these values are according with the established norms of the CONAMA Resolution 357/05 (2005). The sampling was realized in a simple and manual way. All the samples was collected in a plastic and glass recipient, previously cleaned. The samples was manteined in ice, and all the samples was collected respecting a gap of at least 3 days without rain. The variables analyzed on the lab was: Eletric Conductivity; pH; tubidity; chlorides; COD; DBO; thermotolerant coliforms; dissolved oxygen; total phosphorus; nitrate; total solids, and Water temperature. The results were submitted to descriptive statistical analysis in order to establish the average of each parameter to all collection points and compare them to the limits established by CONAMA Resolution 357/05 (2005). Considering the limits of resolution, only the variables of thermotolerant coliforms and Total phosphorus were shown above the limits established by the Board, indicating that the Ligeiro River receives wastewater without proper treatment along its course. With the results obtained by laboratory analysis, was prepared the calculation of IQA for the Ligeiro River in its urban perimeter of Pato Branco. The obtained IQA was 54.62, considered medium.