Blatten Wastewater Treatment Plant, Valais, Switzerland

The Blatten wastewater treatment plant is located in the municipality of Blatten in the Valais/Wallis canton of Switzerland. It serves a population of approximately 898 residents in this alpine village. The plant is situated in the Lötschen Valley, a high-altitude region known for its natural environment. The facility operates with advanced treatment technology, which goes beyond secondary treatment to remove nutrients and other pollutants. With a designed capacity of 1500 m³/day and a current discharge volume of 407.62 m³/day, the plant has ample capacity for current loads. Swiss wastewater treatment plants are regulated under the Swiss Water Protection Act (Gewässerschutzgesetz), which mandates high treatment standards to protect sensitive alpine waters. The treated effluent is discharged into local watercourses that drain into the Lonza river, which flows through the Lötschen Valley and eventually joins the Rhone river. The Rhone then flows into Lake Geneva and ultimately the Mediterranean Sea. The plant plays a crucial role in protecting the fragile alpine aquatic ecosystem and downstream water quality.

The plant's treated effluent enters the Lonza river, a tributary of the Rhone river. The Rhone flows through Lake Geneva and into the Mediterranean Sea. The alpine watershed is ecologically sensitive, supporting diverse aquatic life including trout and other cold-water species. Advanced treatment ensures minimal nutrient loading, protecting the oligotrophic conditions of alpine streams.