Quinta do Papelao Wastewater Treatment Plant, Benavente, Portugal

Quinta do Papelao is a municipal wastewater treatment plant located in Benavente, in the Santarém district of Portugal. It serves a population of approximately 2,800 residents, classifying it as a small agglomeration under EU standards. The plant is situated near the Tagus River basin, an ecologically significant waterway that flows through central Portugal to the Atlantic Ocean. The plant provides secondary treatment, which is the minimum required by the EU Urban Waste Water Treatment Directive (91/271/EEC) for freshwater discharges from agglomerations of this size. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's designed capacity of 3,961 cubic meters per day indicates it has room for future growth, while current discharge volumes average 466.85 cubic meters per day. The treated effluent is discharged into the local watershed, which ultimately drains into the Tagus River and then the Atlantic Ocean near Lisbon. This water body supports diverse aquatic life and is an important migratory corridor for fish species. The plant's operation helps protect downstream water quality and contributes to the ecological health of the Tagus estuary.

The plant discharges into the Tagus River basin, which flows through central Portugal and empties into the Atlantic Ocean at the Tagus estuary near Lisbon. This estuary is a vital habitat for migratory birds and supports diverse aquatic species. The secondary treatment provided helps reduce nutrient and organic pollution, safeguarding the ecological balance of the downstream environment.