Avaliação da capacidade de suporte do arroio da Ronda na cidade de Ponta Grossa

Abstract

The study was accomplished considering a comparison of the water quality between this stream and the sum and downstream of the sewage treatment station Ronda, that belongs to Companhia de Saneamento do Estado do Paraná (SANEPAR) that effects the release of its effluents treated in the stream in question. Physical, chemical and biological parameters of the water were analyzed, that then were compared to the established values by the current legislation CONAMA 357/2005, that relates the classification of the water bodies and the framework of these Waters according to the use in which they can be employed, as well as it established acceptable standards to the release of effluents in the water bodies. The average results obtained, in the downstream matter ETE for dissolved oxygen (2,07 mg/L), biochemical oxygen demand (10,9 mg/L), total phosphor (1,73 mg/L), thermotolerant coliforms (705000 NNP/100ml) and surfactants (>0,5) are found in variance with the current legislation related to rivers of class 3, that is the case of Ronda Stream, classified in this category by competent regulatory body. At the same point, the parameters that complied with the legislations were ph (7,27) and ammonia nitrogen (12,85 mg/L). Starting with these analysis, the Water Quality Index (IQA) was verified, that presented the water classification sum to ETE Ronda as regular in most collections and goo in two of them, in the downstream part to ETE, in all the collections the waters were classified as bad.