Overview
ETE Imperatriz is a municipal wastewater treatment plant serving approximately 85,000 people in Imperatriz, Maranhão, Brazil. It operates under Brazil's national water quality regulations.
ETE Imperatriz is a wastewater treatment plant located in Imperatriz, a city in the state of Maranhão, Brazil. The plant serves an estimated population of 85,086, placing it in the medium-to-large agglomeration category for Brazilian wastewater infrastructure. As a facility in Brazil, ETE Imperatriz is subject to the National Environmental Council (CONAMA) resolutions and the National Water Resources Policy (Law 9.433/1997), which set discharge standards and water quality goals. For a plant of this scale, secondary treatment is typically required to meet effluent limits for biochemical oxygen demand and suspended solids. The plant's treated effluent is discharged into local water bodies that ultimately drain into the Tocantins River basin, a major Amazon tributary. This region supports diverse aquatic ecosystems and is important for downstream water quality in the Amazon estuary.
Environmental context
The plant's discharge enters the Tocantins River basin, which flows northward through the Amazon rainforest before reaching the Atlantic Ocean near the Amazon River delta. This watershed is ecologically sensitive, supporting diverse fish species and providing habitat for aquatic life. Proper treatment is essential to prevent nutrient loading and protect downstream water quality in this biodiverse region.
Frequently asked questions
ETE Imperatriz is located in Imperatriz, a city in the state of Maranhão, Brazil. The plant serves the urban population of Imperatriz and surrounding areas.
The plant serves approximately 85,086 people, classifying it as a medium-to-large agglomeration under Brazilian wastewater standards.
The treated effluent from ETE Imperatriz is discharged into local water bodies that flow into the Tocantins River basin, which ultimately reaches the Atlantic Ocean.
The plant operates under Brazil's CONAMA resolutions and the National Water Resources Policy, which set effluent quality standards and require monitoring to protect water resources.
For agglomerations of this size, Brazilian regulations typically mandate secondary treatment to reduce organic matter and suspended solids before discharge.
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