ETE FOSSA FILTRO TAQUARA - Secondary Wastewater Treatment in Petrópolis, Rio de Janeiro

ETE FOSSA FILTRO TAQUARA is a municipal wastewater treatment plant located in the Vila Alto Independência neighborhood of Petrópolis, in the state of Rio de Janeiro, Brazil. The plant serves a small population of 368 residents, providing secondary treatment to domestic wastewater. It operates as part of the region's sanitation infrastructure, contributing to public health and environmental protection in the mountainous terrain of the Serra dos Órgãos. As a secondary treatment facility, the plant employs biological processes to reduce organic matter and suspended solids, meeting Brazilian regulatory standards for effluent quality. Brazilian wastewater treatment plants are governed by CONAMA resolutions and state-level environmental agencies, which set discharge limits based on the receiving water body's classification. For small agglomerations like this, secondary treatment is typically sufficient to protect local water quality. The treated effluent is discharged into local watercourses that eventually flow into the Piabanha River, a tributary of the Paraíba do Sul River. The Paraíba do Sul basin is a critical water source for southeastern Brazil, supplying drinking water to millions and supporting diverse aquatic ecosystems. The plant's operation helps reduce nutrient and pathogen loads, safeguarding downstream communities and ecological health.

The plant discharges into streams that feed the Piabanha River, which flows into the Paraíba do Sul River, a major waterway draining to the Atlantic Ocean near Campos dos Goytacazes. The Paraíba do Sul basin supports Atlantic Forest remnants and is vital for water supply, agriculture, and hydropower. The plant's secondary treatment reduces organic pollution, protecting aquatic life and downstream water quality in this ecologically sensitive region.