Avaliação de risco ecológico do sedimento na Lagoa de Jacarepaguá - RJ

• Autor(a) principal: Rodrigues, Isabela Yasmin das Chagas
• Data de Publicação: 2022
• Outros Autores: [e-mail]
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UERJ
• Texto Completo: http://www.bdtd.uerj.br/handle/1/18500
• topic: Environmental engineering; Ecological risk assessment; Lake sediments; Wastewater in rivers, lakes, etc - Rio de Janeiro (RJ); Toxicity tests; Engenharia ambiental; Avaliação de riscos ecológicos; Sedimentos lacustres; Águas residuais nos rios, lagos, etc - Rio de Janeiro (RJ); Testes de toxicidade; ENGENHARIAS::ENGENHARIA SANITARIA::SANEAMENTO AMBIENTAL::CONTROLE DA POLUICAO

The Lagoon of Jacarepaguá (LJPA) is part of a lagoon complex, formed by three other lagoons, located in the west of the city of Rio de Janeiro, and has the largest drainage area of the complex (103 Km2). LJPA constantly receives the clandestine release of domestic and industrial effluents, in addition to diffuse contributions from the drainage of water from different sources, with a high pollutant load. The Ecological Risk Assessment (ERA) is an important tool that enables a more global view of risks for the management of contaminated areas, including the identification of adverse effects of contaminants on the environment. The purpose of this study is develop an ARE for LJPA, using three lines of evidence (LoE): Ecotoxicological, Ecological and Chemical. The sediment samples were collected at four sampling points in the LJPA. The Ecotoxicological LoE was based on chronic ecotoxicity assays (Chlorella vulgaris and Ceriodaphnia dubia) to estimate the Ecotoxicological Risk, which presented an average value of 0.88 and was classified as very high. The Ecological LoE was based on the analysis of the richness and abundance of local algae species for estimate the Ecological Risk, presenting an average value of 0.75, being classified as very high. The Chemical LoE through the values of metals found in the sediment samples taken from the Lagoon to estimate the Chemical Risk, presenting an average value of 0.69 being classified as high. The Environmental Risk was estimated integrating the Risks of the three LoE, presenting an average value of 0.87, being classified as very high.The highest risk indices were found at points P2 and P3, followed by points P1 and P4, with values of 0.97, 0.97, 0.89 and 0.65, respectively. The current environmental risk of the LJPA exposes the urgent need for more enforcement actions to prevent the release of sewage before the complete degradation of this important ecosystem of the City of Rio de Janeiro.