Abstract

FORNARI, Mayara Regina  and  CAMOTTI-BASTOS, Marilia. Urban effluents in the water of the Marau River (Brazil). Water quality on the river. Bitácora Urbano Territorial [online]. 2018, vol.28, n.3, pp.121-130. ISSN 0124-7913.  https://doi.org/10.15446/bitacora.v28n3.68152.

The objective of this study was to analyze the impact of urban and industrial waste in the municipality of Marau (Rio Grande do Sul - Brasil) on the water quality of the Marau River. The analyzed parameters were: pH, turbidity, electrical conductivity, surface tension, organic carbon, metals, nitrite, nitrate, chloride, phosphate, sulfate and dissolved phosphorus. The river water samples were collected in September 2014 and 2016 in the points: upstream of the Marau city and the tannery; upstream of the tannery; at the point of mixing the effluent from the leather processing industry and river; downstream of the Marau city. The physical-chemical analysis of river water showed that the effluents of the Marau city represents the major source of local contamination, since present values of Al, Pb and P higher than allowed by law. It was concluded that the industrial activities and the sewage of the Marau city have a negative impact on the river water quality.

Keywords : urbanization; contamination; water quality; tannery; clandestine effluents.

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