Langdorf Wastewater Treatment Plant - Bayern, Germany

Langdorf wastewater treatment plant is located in the town of Langdorf, in the Landkreis Regen district of Bayern, Germany. The plant served a population of 824 and was designed with a capacity of 1,900 m³/day, with an average discharge volume of 208.53 m³/day. The facility is now closed. The plant provided secondary treatment, which is the minimum standard required under the EU Urban Waste Water Treatment Directive (91/271/EEC) for agglomerations with a population equivalent (PE) between 2,000 and 10,000. Although Langdorf's population served is below 2,000, the plant's design capacity suggests it may have been sized for future growth or industrial loads. The directive requires secondary treatment for all discharges from agglomerations above 2,000 PE, and for sensitive areas, tertiary treatment may be mandated. The treated effluent was discharged into a local watercourse that ultimately drains into the Danube River basin via the Regen River. The Regen River flows into the Danube, which then empties into the Black Sea. The plant's operation contributed to protecting the local aquatic ecosystem by reducing organic load and nutrients in the receiving waters, supporting biodiversity in the Bavarian Forest region.

The plant discharged into a tributary of the Regen River, which flows through the Bavarian Forest and joins the Danube near Regensburg. The Danube then travels over 2,800 km to the Black Sea. The region is ecologically sensitive, supporting diverse aquatic life including fish species such as brown trout and grayling. The plant's secondary treatment helped reduce biochemical oxygen demand and suspended solids, protecting downstream water quality.