RIALP Wastewater Treatment Plant, Rialp, Catalonia, Spain

RIALP is a wastewater treatment plant located in Rialp, a town in the Pallars Sobirà region of Lleida, Catalonia, Spain. The plant serves a small population of 318 residents, reflecting its role in a rural mountain community. It is situated along the C-13 road in the Pyrenees, an area known for its natural landscapes and tourism. The plant operates with secondary treatment, which is the standard biological process required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 2,880 cubic meters per day, and the current discharge volume is 326.59 cubic meters per day, indicating ample capacity for the served population. The plant is part of Spain's national wastewater infrastructure, regulated by regional authorities in Catalonia. Treated effluent from RIALP is discharged into the local river system, which flows through the Noguera Pallaresa River valley and eventually drains into the Ebro River basin. The Ebro River is one of Spain's major waterways, supporting diverse aquatic life and agricultural activities downstream. The plant's operation helps protect the sensitive Pyrenean ecosystem and the water quality of the Ebro basin.

RIALP discharges into the Noguera Pallaresa River, a tributary of the Segre River, which flows into the Ebro River and ultimately reaches the Mediterranean Sea. The plant is located in the Pyrenees, a region with high ecological value, supporting species such as the Pyrenean desman and brown trout. The secondary treatment ensures that organic pollutants are reduced before release, protecting the river's biodiversity and downstream water quality.