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.
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