1. Erftverband, Am Erftverband 6, D 50126, Bergheim, Germany
2. Catalan Institute for Water Research (ICRA) and Universitat de Girona (LEQUIA-UdG), Girona, Spain
3. LBE, INRA, Univ. Montpellier, Narbonne, France
4. Université Montpellier, Montpellier, France
5. Universitat de València, Valencia, Spain
6. KU Leuven, Leuven, Belgium
7. Engineering Department, University of Palermo, Palermo, Italy and College of Environmental Science and Engineering, Tongji University, China