Plavinu pilsetas NAI Wastewater Treatment Plant, Pļaviņas, Latvia

Plavinu pilsetas NAI is a municipal wastewater treatment facility located in Pļaviņas, a town in the Aizkraukle Municipality of Latvia. The plant serves a small population of around 691 people, reflecting the scale of this rural community. It operates as a secondary treatment plant, which is the standard level required under the EU Urban Waste Water Treatment Directive for agglomerations of this size. As a secondary treatment plant, Plavinu pilsetas NAI employs biological processes to remove organic matter and suspended solids from wastewater. The plant has a designed capacity of 560 m³ per day, with an average discharge volume of approximately 189 m³ per day, indicating it operates well within its capacity. This ensures effective treatment and compliance with environmental standards. The treated effluent is discharged into the local watershed, which ultimately drains into the Daugava River, one of Latvia's major waterways. The Daugava flows into the Gulf of Riga in the Baltic Sea, making the plant's operations important for protecting downstream aquatic ecosystems and the Baltic Sea marine environment. Proper secondary treatment helps reduce nutrient loads and organic pollution, supporting water quality in the region.

The plant discharges into the Daugava River basin, which flows through central Latvia and empties into the Gulf of Riga, part of the Baltic Sea. This watershed supports diverse aquatic life and is an important migratory corridor for fish species. The Baltic Sea is a sensitive brackish environment prone to eutrophication, so effective nutrient removal from wastewater is critical for maintaining ecological balance.