Abstract

The water body, object of this study, Grande igarapé, is located in the Municipality of Boa Vista, State of Roraima, in the northern region of Brazil. The present study aims to evaluate the environmental impact caused by the contribution of substances in the igarapé and possibly in the Branco River after receiving the ETE / Boa Vista-RR effluent through the determination of physical-chemical and biological parameters (chlorophyll-a). In the accomplishment of this study six points of collections considered strategic to the attainment of the proposed objectives were selected. The parameters were analyzed: color, turbidity, conductivity, pH, temperature, dissolved oxygen, nitrite, ammonia, total phosphorus, chloride, BOD5, COD, chlorophyll a. The igarapé suffers the human impact through the withdrawal of the vegetal cover, waterproofing of the ground by the occupation of the surroundings and launches of polluting agents. Through the results it was possible to confirm the impact of the discharge of the effluent on Great stream. Parameters such as phosphorus, ammonia, nitrite and chlorophyll-a have shown that the Grande stream does not have assimilation capacity, especially during periods of drought, of nutrients and contaminating species during the journey to its mouth in the Branco river. The analysis of the data obtained in its environmental amplitude shows the need to plan actions to reverse the environmental damage caused to the Great stream and its biodiversity.

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