KVÆLSTOFFJERNELSE VED BIOLOGISK DENITRIFIKATION- ANLÆGSALTERNATIVER / Nitrogen Removal by Biological Denitrification - Process Alternatives
Nitrogen removal by biological denitrification is a well-known process. Several processes in full scale are operating in Scandinavia. The process alternatives are described on the basis of biomass composition, process lay-out, and special contractor design. The systems described includes biological filters, seperate sludge systems, and combined sludge systems. Combined sludge is the most common system with more than 90 % of the denitrification treatment plants in Scandinavia. The different system alternatives are evaluated with basis in different construction and process parameters. It is concluded that local conditions play a major role in the selection of the process system.