Understanding transformation of OMPs during plasma treatment and its ecotoxicological implications

Catalan Institute for Water Research, Girona, Spain

1. University of Girona, Spain

2. University of Ferrara, Italy

Non-thermal plasma in liquid and gas-liquid environments generates in situ oxidizing species, such as hydroxyl radicals, ozone, hydrogen peroxide, peroxynitrites etc., capable to degrade OMPs from the solution relatively quickly, and even using low power discharges. However, oxidative breakdown is influenced by the scavenging capacity of matrix components, resulting in the accumulation of transformation products (TPs) rather than complete mineralization. Knowledge regarding the degradation mechanisms of the investigated chemical compounds under plasma conditions and the evolution of reaction by-products are crucial from the point of view of practical application and optimization of treatment time and power discharges. The main objective of this project is to elucidate transformation pathways of selected organic micropollutants (WFD Watch List compounds recalcitrant to biological treatment) using advanced analytical methodologies based on high resolution mass spectrometry (Orbitrap MS) and to identify those transformation products posing the highest risk for the aquatic environment if discharged or for humans in case of reuse of treated water for potable purposes. Effect of process modifications (the addition of catalysts or combination of plasma with ozonation) on the formation of TPs and their persistence will be evaluated.

University of Ferrara, Italy – 6 months

Institute of Physics, Belgrade, Serbia – two short stays (1 month)