ARRILD Wastewater Treatment Plant, Toftlund, Denmark

ARRILD is a wastewater treatment plant located at 10B Slotsvej in Toftlund, Tønder Kommune, Denmark. It serves a population of 659 and operates under the Danish regulatory framework, which implements the EU Urban Waste Water Treatment Directive (91/271/EEC). As a small agglomeration, the plant is required to provide secondary treatment, which it does. The plant has a designed capacity of 2200 m³/day and currently discharges 244.33 m³/day of treated wastewater. Secondary treatment typically involves biological processes to reduce organic matter and suspended solids. The plant's capacity utilization is low, indicating ample reserve capacity. The treated effluent is discharged into local watercourses that drain into the North Sea via the Wadden Sea region. This area is ecologically sensitive, supporting diverse aquatic life and serving as an important migratory corridor for birds. The plant's operation helps protect the downstream environment by reducing pollutant loads.

The treated wastewater from ARRILD flows into local streams and rivers that eventually reach the Wadden Sea, a shallow coastal sea along the Danish west coast. This area is an ecologically significant habitat for fish, shellfish, and migratory birds. The plant's secondary treatment reduces organic pollution and helps maintain water quality in the sensitive coastal ecosystem.