SIA Jelgavas udens Lapsakalna iela 22 Wastewater Treatment Plant, Jelgava, Latvia

SIA Jelgavas udens Lapsakalna iela 22 is a municipal wastewater treatment plant located in Jelgava, Latvia. The facility serves a population of approximately 67,559, making it a medium-to-large agglomeration under EU classification. The plant is situated in the Lielupe River catchment, which ultimately drains into the Baltic Sea. As a plant serving over 50,000 people, it operates under the EU Urban Waste Water Treatment Directive 91/271/EEC, which requires secondary treatment as a minimum. For sensitive areas, tertiary treatment may be mandated. The plant's designed capacity is 1. 00 (likely in thousands of cubic meters per day), indicating a substantial infrastructure to handle the city's wastewater. The treated effluent is discharged into the Lielupe River, which flows into the Baltic Sea. This river supports diverse aquatic life and is an important ecological corridor. The Baltic Sea is a sensitive marine environment, making effective nutrient removal critical to prevent eutrophication.

The plant discharges into the Lielupe River, which flows through central Latvia and empties into the Baltic Sea via the Daugava River delta. The Baltic Sea is a brackish, semi-enclosed sea highly sensitive to nutrient pollution, where excess nitrogen and phosphorus from wastewater can cause algal blooms and hypoxia. The Lielupe basin supports diverse freshwater ecosystems and is used for recreation and fisheries.