1. Unit of Environmental Engineering, University of Innsbruck, 6020 Innsbruck, Austria
2. Department of Civil and Environmental Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
3. Department of Microbiology, University of Innsbruck, 6020 Innsbruck, Austria
4. Institute of Water Quality and Resource Management at TU Wien, 1040 Vienna, Austria
5. Ministry of Social Affairs and Culture, Liechtenstein, 9490 Vaduz