Removal of pharmaceutical residues from wastewater by ozonation and activated carbon has been demonstrated at the Swedish demonstration site Hammarby Sjöstadsverk with promising results for both technologies.
Pharmaceuticals are designed to be able to resist microbial degradation, which implies most pharmaceutical substances are still intact when entering wastewater treatment plants and for many also when discharged to receiving water bodies after treatment. In order to achieve a further reduction with removal rates of at least 90-95 %, a treatment e.g.with strong oxidizers (AOP) or activated carbon is needed. Within R3Water, both technologies mentioned above (ozonation and activated carbon respectively) have been demonstrated. Influent wastewater was treated by pre-precipitation, pre-denitrification, and nitrification in a pilot scale MBR at the demo site. Effluent wastewater from the MBR, located in an equalisation tank, was then used in the demonstration to compare the effects from ozonation and activated carbon. The results are promising for both technologies with slightly higher removal efficiency for the activated carbon compared to ozonation (ozonation dose of 7 g ozone/m3). The removal efficiency though varies quite a lot between the selected pharmaceuticals, indicating that even further additional treatment might be needed for a high removal of all selected pharmaceuticals.
Figure 1. Schematic illustration of the pilot ozonation Equipment.
Figure 2. Schematic illustration of the pilot GAC filter.Leave a reply →