Tender for turnkey contract regarding design and construction of a new ozone treatment process at Egaa Wastewater Treatment Plant

Description

There has been a significant change in the composition of the wastewater to the Egaa WWTP due to the expansion of Aarhus University Hospital in Skejby. Pharmaceutical residues have been registered that are above the PNEC values in the discharge from the Egaa WWTP following the expansion of the hospital. This has led Aarhus Municipality to conclude that additional treatment for pharmaceutical residues must be carried out at the WWTP. A 4th treatment step therefore has to be established at Egaa WWTP to achieve sufficient removal of pharmaceutical residues in the effluent. A screening of available treatment technologies and theoretical modelling has been carried out based on the 10 focus substances that can be measured in the effluent from Egaa WWTP. From this, it is concluded that implementing an ozone treatment in front of the existing sand filter will be enough to remove the remaining pharmaceutical residues.