Análise preliminar de dados de qualidade da água do arroio Olaria em Itaqui, RS

Abstract

The present research is objectified by the analysis of water quality of Olaria Stream in the city of Itaqui, RS, and of the analytical techniques necessary for this purpose, analyzing the Physical-Chemical and Microbiological variables of coliforms in water samples obtained in different points of the streams of the city. For this, 10 points were chosen within the Geographic Information System (SIG) based on previous laboratory monitoring experiences. The samples were collected and analyzed following the recommendations of the Standard Methods during the months of October and November 2018, in dry periods and after precipitation. The points sampled correspond mainly to the to a sequence from the source to the mouth of the Olaria Stream, which runs through the city. The stream receives several slopes along its route, partly hidden by urbanization. The advance through the city increases the number of coliforms, conductivity, turbidity, the DBO, the pH, and decreases the and the ORP, but the dilution with waters of pure slopes or of the Uruguay River in the points near the mouth lessen these effects. One of the visible causes of pollution is the increase of direct sewage connections in streams, industrial and commercial discharges and the intensive raising of animals in the surroundings are added. The floods appear to be factors that influence water quality of the different streams, due to the great flow of the Uruguay river. The present study This is a successful case of curricularisation the extension and research, of which this work was part through the sampling, research, analysis and discussion of results for samples from one of the most polluted streams in the region. The work can certainly be continued through the implementation and refinement of more analytical methodologies that were not discussed in this study.