ETE SAO LUIS DO PARAITINGA - Secondary Wastewater Treatment Plant in São Luiz do Paraitinga, São Paulo

ETE SAO LUIS DO PARAITINGA is a municipal wastewater treatment plant located in São Luiz do Paraitinga, within the Região Metropolitana do Vale do Paraíba e Litoral Norte in São Paulo state, Brazil. The plant serves a population of 5,086 and operates with secondary treatment, which is appropriate for a community of this size under Brazilian regulatory standards. As a secondary treatment facility, the plant removes organic matter and suspended solids through biological processes, meeting the effluent quality requirements set by Brazilian environmental legislation (CONAMA resolutions). The plant discharges 649.53 thousand cubic meters of treated wastewater annually, reflecting its role in managing local domestic sewage. The treated effluent is released into the local watershed, which drains into the Paraíba do Sul River basin, a major watercourse that flows through the states of São Paulo, Rio de Janeiro, and Minas Gerais. The Paraíba do Sul River is vital for water supply, agriculture, and industry, and supports diverse aquatic ecosystems. The plant's operation helps protect downstream water quality and ecological health.

The plant discharges into the Paraíba do Sul River basin, which flows through the Atlantic Forest biome and ultimately reaches the Atlantic Ocean near Campos dos Goytacazes. The river supports a rich diversity of fish and other aquatic life, and its waters are used for drinking water supply for millions of people. The secondary treatment provided by the plant reduces organic pollution and helps maintain the ecological balance of this important river system.