BioDRY SB 100 Wastewater Treatment Plant, Līgatne, Latvia

BioDRY SB 100 was a wastewater treatment plant located in Līgatne, a town in Cēsu novads, Latvia. The plant served a small population of 205 people and operated with secondary treatment before its closure. Its designed capacity was 500 m³/day, with an average discharge volume of 39.13 m³/day. As a secondary treatment facility, the plant met the basic requirements under the EU Urban Waste Water Treatment Directive (91/271/EEC), which mandates secondary treatment for agglomerations of this scale. The directive aims to protect water quality by ensuring adequate treatment before discharge into receiving waters. The plant's treated effluent was discharged into the local environment, contributing to the Gauja River basin. The Gauja River flows through the Gauja National Park and eventually reaches the Baltic Sea. Proper treatment helps safeguard the ecological health of these downstream waters.

The plant discharged into the Gauja River basin, which flows through the Gauja National Park and eventually into the Baltic Sea. The Gauja River supports diverse aquatic life and is an important recreational and ecological corridor. Secondary treatment helps reduce organic pollutants and nutrients, protecting downstream ecosystems from eutrophication and maintaining water quality for sensitive habitats.