Qualidade de água em áreas influenciadas por uma estação de tratamento de esgosto na Amazônia

Abstract

The Sewage Treatment Station - ETE, located in the Amazon region, was built to improve the region's sanitation system, using the water body to release its treated effluent. Therefore, the evaluation of the influence of the ETE effluent discharge on the water quality of the water body is essential to determine the concentrations of the physicochemical and microbiological parameters of the receiving body, comparing them with CONAMA Resolution 357/05. To this end, three campaigns were carried out, with four sampling points, P1 (spring), P2 (Outlet), P3 (Lago do Papucu) and P4 (Foz), with P2 upstream and P3 downstream in relation to the effluent discharge point . Additionally, for each point, the guidelines of the National Guide for Sample Collection and Preservation and methodology of the Standard Methods for the Examination of Water and Wastewater were followed, thus, the analyzes of the parameters of dissolved oxygen, conductivity, total dissolved solids were performed , temperature, color, aluminum, residual chlorine, iron, manganese, sulfate, sulfide, zinc, nitrite nitrite, ammonia nitrogen, fluoride phenols, total coliforms and E.Coli. When complying with Resolution 357/05, points P2, P3 and P4 showed concentrations of color, dissolved oxygen, iron, aluminum, manganese, residual chlorine, phenols and sulfide in disagreement with the Resolution. Therefore, it is concluded that the ETE Mapirí does not influence the physicochemical and microbiological parameters of the receiving body, as the upland (P2) has higher concentrations downstream (P3), that is, there is a greater influence on the water body before the effluent discharge, which has anthropic interference, such as the release of in natura sewage.