AVALIAÇÃO DA QUALIDADE DA ÁGUA DO RIO SANHAUÁ NA ÁREA DE INFLUÊNCIA DIRETA DO ANTIGO LIXÃO DO RÓGER

Abstract

Urban rivers are daily impacted by anthropogenic pressures from urbanization processes that affect their capacity for self-purification and lead to degradation. Thus, water quality monitoring is an important management tool in terms of the water ecosystems equilibrium and the uses offered by them. The present study aimed to evaluate the water quality of the Sanhauá river, in the direct interference area from the old Roger 's dump. It was based in a ten years series data (2006 - 2016) by considering its temporal and spatial variations and its framework that is established by the Environmental Protection Council – COPAM and Environmental Administration Superintendence - SUDEMA. Based on the results, it was concluded that the river has a high pollution level, especially when it refers to parameters of BOD, phosphorus, chlorides, sulfate, conductivity and dissolved solids which shows that the river is susceptible to eutrophication processes. In addition, it was verified an incoherence on the water classification proposed by the state environmental agency, which considers the freshwater river (class 3) that leads to the need to reevaluate the water classification to brackish water (class 1) due to salinity characteristics evidenced by the parameters of electrical conductivity, dissolved solids and total dissolved solids, the presence of mangrove vegetation, the location in the estuarine area and its preponderant uses.