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 BIODEN® process provides a targeted, environmentally compatible reduction in the nitrate content of drinking water. It is based on the natural process of biological denitrification, which takes place in soil and ground water.

The most important advantages of the process are:

• Degradation of pollutant.
• Virtually complete denitrification.
• Most selective process.
• Full water recovery.
• Excellent partial load capability.
• Plant stability and reliability.
• The generation of relatively small amounts of wastewater without any Nitrates
• Easy adherence to all guide levels and maximum admissible concentrations.
• Flexible combination with other treatment processe (e.g. for Arsen removal or softening).