1. a Department of Civil and Environmental Engineering, Institute of Urban Water Management and Environmental Engineering, Ruhr-Universität Bochum, Universitätsstraße 150, Bochum 44801, Germany
2. b Dr. Pecher AG, Klinkerweg 5, Erkrath 40699, Germany
3. c Faculty of Energy, Building Services, Environmental Engineering, University of Applied Sciences Münster, Stegerwaldstraße 39, Steinfurt 48565, Germany