ETE Barreirinhas Wastewater Treatment Plant - Barreirinhas, Maranhão, Brazil

ETE Barreirinhas is a municipal wastewater treatment plant located in Barreirinhas, a city in the state of Maranhão, northeastern Brazil. The plant serves a population of approximately 1,943 residents, reflecting its role in a small community. It is situated in the Região Geográfica Imediata de Barreirinhas, part of the broader São Luís intermediate region. The plant provides secondary treatment, which is the standard biological process for removing organic matter and suspended solids. Under Brazil's national environmental regulations (CONAMA resolutions), secondary treatment is appropriate for communities of this size. The plant treats an average of 216 cubic meters of wastewater per day, indicating a modest operational scale consistent with the local population. The treated effluent is discharged into nearby water bodies that ultimately drain into the Atlantic Ocean. The region is characterized by coastal ecosystems, including mangroves and dunes, which are sensitive to nutrient inputs. Proper treatment helps protect these environments from eutrophication and maintains water quality for downstream uses.

The plant discharges into local streams that flow toward the Atlantic coast of Maranhão, an area known for the Lençóis Maranhenses National Park and its unique dune-and-lagoon ecosystems. The receiving waters support diverse aquatic life and are important for local fisheries. Secondary treatment reduces organic load and suspended solids, helping to preserve the ecological balance of these sensitive coastal habitats.