Plant renovation boosts energy production - by use of AVK knife gate valves

The renovation of Egaa Wastewater Treatment Plant was initiated to gain a maximum energy output. A fruitful collaboration with leading suppliers of technologies, processes and components made this possible.

Cleaning of nitrogen with Anammox-bacteria

With the establishment of a DEMON® Anammox reject water plant the electricity consumption for nitrogen cleaning is reduced. The Anammox bacteria are generated in this process and besides cleaning the reject water, they also clean the wastewater in the process tanks without any use of carbon.

Carbon filtering with Salsnes®-filters

Norwegian Salsnes® has developed the strip filters that are used early in the process to filter carbon from the wastewater. This reduces the energy consumption for aeration, which previously was about 40 % of the total energy consumption, since less carbon is discharged to the process tanks. The concentration of solid in the primary sludge which is extracted from the strip filters is so high that pre-dewatering can be avoided. The primary sludge and the biological sludge are both pumped to the digestion tank where biogas is generated.