Eriskirch Clarification Plant, Eriskirch / Germany

Making Lake Constance Visibly Cleaner

Eriskirch is located directly on Lake Constance, Europe’s largest drinking water reservoir. In the 1970’s this unique natural resource was threatened by eutrophication due to acute phosphate contamination. The problem was immediately addressed by a number of remedial measures, the key one of which was the Eriskirch clarification plant.

As Harald Schäfer, Environmental Minister for the German state of Baden-Württemberg at the time, explained:
"With the start-up of this first flocculation-filtration unit on the shores of Lake Constance, the Wastewater Association of the Lower Schussen Valley demonstrates their firm commitment to keeping environmental water clean.” Meeting all expectations, the plant’s seven DIN 19605-conformant EVERZIT® N multilayer filter units dramatically reduced phosphate concentrations to trace levels of only 0.1 - 0.2 mg / L. The resultant improvement in water quality in the mouth of the Schussen river, i.e. where it flows into Lake Constance, was noticeable to the naked eye.

Advantages of EVERZIT® N

Used as the upper layer in these multilayer filter beds, EVERZIT® N increases treatment capacity and reduces operating costs by providing specific benefits:

  • Increased solids filtration capacity
  • Higher flow speeds through filter bed
  • Reduced pressure drop
  • Longer operation cycle of filter media
  • Reduced backwash-related downtime and costs

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Technical Data

Capacity of Filtration:approx. 1800 m³/h
Number of filters:7 open dual media filters
Total surface:155 m²
Filtration velocity:approx. 12 m/h

Filter layout

Filter materialHeightGrain size
EVERZIT® N:850 mm1.4 - 2.5 mm
Quartz sand:650 mm0.71 - 1.25 mm
Quartz gravel:150 mm2.5 - 5.6 mm