Prof. Ján Derco, DSc. has graduated from the Faculty of Chemical and Food Technology, Slovak Technical University (SUT) as M.Sc. in Chemical Engineering. Then he started working at the Department of Environmental Engineering at the same faculty where he has continued his research. Later he obtained his PhD. and DSc. (doctor of sciences) graduations from the same University. Main field of his scientific interest are environmental engineering, biological wastewater treatment, modelling, design and optimisation, ozone based oxidation processes and priority substances and micropollutants degradation and transformation. Presently he is working as Professor at the Institute of Chemical and Environmental Engineering, SUT.