PU Babites siltums Wastewater Treatment Plant, Babītes pagasts, Latvia

PU Babites siltums is a wastewater treatment plant located in Babītes pagasts, Mārupes novads, Latvia. The facility serves a population of approximately 4,448 people, classifying it as a small to medium agglomeration under EU classification. The plant is situated near the coast, within 10 km of the Baltic Sea, which influences its environmental management requirements. The plant employs advanced treatment processes, which go beyond the secondary treatment standard mandated by the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations of this size. The designed capacity is 7,300 m³/day, with an actual discharge volume of 800.99 m³/day, indicating significant spare capacity. As a coastal plant, advanced treatment helps protect sensitive marine environments from nutrient pollution. The treated effluent is discharged into the local watershed, which ultimately drains into the Baltic Sea via the Lielupe River basin. The Baltic Sea is a brackish inland sea with limited water exchange, making it highly sensitive to eutrophication from nutrient inputs. The plant's advanced treatment plays a key role in reducing the ecological impact on this vulnerable marine ecosystem.

The plant discharges into the Lielupe River basin, which flows into the Gulf of Riga and then the Baltic Sea. The Baltic Sea is a semi-enclosed sea with low salinity and slow water renewal, making it highly susceptible to nutrient pollution and algal blooms. Advanced treatment at this coastal plant helps mitigate eutrophication risks, supporting the ecological health of downstream coastal lagoons and marine habitats.