Performance range


Biological Denitrification – The BIODEN® process

BIODEN® is one of the WABAG-developed biological process for ground water denitrification. The process functions according to the principles of heterotrophic, biological denitrification with ethanol or acetic acid as a carbon source. Basically, it consists of nutrient dosage, a biological filter, subsequent aeration for oxygen enrichment, downstream flocculation filtration and final safety disinfection.

The most important advantages of the process are:

  • Degradation of pollutant.
  • Virtually complete denitrification.
  • Excellent partial load capability.
  • The generation of relatively small amounts of wastewater.
  • Plant stability and reliability.
  • Easy adherence to all guide levels and maximum admissible concentrations.

The first full-scale BIODEN®-plant, with a capacity of 4,300 m3/d, has been in operation at Obersiebenbrunn in Austria since 1997. Nitrate levels have been reduced from 65 mg/l to < 5 mg/l.

A plant in Czestochowa, Poland was commissioned at the beginning of 2006 and has a capacity of 12,000 m3/d. It enables a reduction in nitrate levels from 80 mg/l to 5 mg/l. Furthermore, the plant ensures 100% water recovery and the treated water can be blended with raw water.

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