In the last years an increase of endocrine related malfunctions and diseases, like breast and testicular cancer, diminished sperm quality, reduced fertility among animals and feminization of male animals has been detected. This increase is probably caused by anthropogenic organic micropollutants (OMP), especially pharmaceuticals, which are released into the environment by contaminated wastewater. State of the art municipal wastewater treatment plants with up to three treatment stages are designed for the removal of nutrients, degradable organic compounds and solids. While, these plants are able to partially remove anthropogenic OMPs, their concentrations remain above the NOEC (No Observed Effect Concentration). Thus, an additional fourth treatment stage is needed in wastewater treatment plants in order to reduce the concentration of OMPs to a value clearly below the NOEC.
At the moment, two technologies are used commercially for the removal of anthropogenic OMPs in this fourth treatment step. Ozonization shows a broad-spectrum effect against many OMPs due to the destruction of the chemical structure. This destruction is caused by ozone-induced oxidation, which is breaking the chemical bondings. Biggest drawback is that this oxidation often leads to substances with unknown or even more toxic effects than the original ones. Thus, all ozonization stages need a step for the removal of these substances afterwards. Another possibility is the adsorption of OMPs on activated carbon powder, which shows also a good broad-spectrum effect and avoids the formation of dangerous reaction products. Still, handling of the powder is quite challenging and the introduction of such an adsorption unit needs extensive modifications. A new approach uses...
Session: M7 - Process and Waste Water Treatment II
Day: 15 March 2018
Time: 13:00 - 14:15 h