1. Environmental and Process Engineering Research Group, Department of Chemical and Environmental Process Engineering, Budapest University of Technology and Economics, Budafoki Street 8, H-1111 Budapest, Hungary
2. Szelence Kamionmoso, Ipartelep, H-2431 Szabadegyhaza, Hungary
3. Institute of Chemistry, Faculty of Material Science and Engineering, Department of Fine Chemicals and Environmental Technology, University of Miskolc, Egyetemvaros C/1 108, H-3515 Miskolc, Hungary