Overview
ZULLWILMELTINGEN is a secondary wastewater treatment plant in Zullwil, Solothurn, Switzerland, serving approximately 900 people with a designed capacity of 3,950 m³/day.
ZULLWILMELTINGEN wastewater treatment plant is located in Zullwil, a municipality in the Bezirk Thierstein district of Solothurn, Switzerland. The plant serves a small population of around 900 residents, reflecting its role in a rural or small-town setting within the Swiss wastewater infrastructure. The plant provides secondary treatment, which is the standard biological treatment level required under Swiss water protection legislation. Swiss regulations, aligned with the EU Urban Waste Water Treatment Directive, mandate secondary treatment for agglomerations of this size. The plant's designed capacity of 3,950 m³/day indicates it is sized to handle peak flows and future growth, while current discharge volume is approximately 408.53 m³/day. The treated effluent is discharged into the local watershed, which ultimately drains into the Rhine River basin via the Birs or other nearby tributaries. The Rhine is a major European waterway that flows into the North Sea, supporting diverse aquatic ecosystems and providing drinking water for millions. The plant's secondary treatment helps protect downstream water quality in this ecologically significant basin.
Environmental context
The plant discharges into the local watershed within the Rhine River basin, one of Europe's most important river systems. The Rhine flows through Switzerland, Germany, and the Netherlands before reaching the North Sea, supporting diverse aquatic life and providing critical habitat for migratory fish species. Secondary treatment reduces organic pollutants and suspended solids, helping maintain water quality in this ecologically sensitive basin.
Frequently asked questions
ZULLWILMELTINGEN is located in Zullwil, in the Bezirk Thierstein district of Solothurn, Switzerland. The address is Bachtelenweg, Zullwil, 4234.
The plant serves approximately 900 people, making it a small-scale municipal treatment facility.
The treated effluent is discharged into the local watershed, which flows into the Rhine River basin. The Rhine ultimately drains into the North Sea.
The plant provides secondary treatment, which is the standard biological treatment required under Swiss water protection laws for small agglomerations.
Switzerland's water protection legislation aligns with the EU Urban Waste Water Treatment Directive, requiring secondary treatment for agglomerations of this size. The plant's operation supports compliance with national water quality standards.
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