1 School of Civil Engineering, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: i.pikaar@uq.edu.au.
2 Australian Centre for Water and Environmental Biotechnology, The University of Queensland, Brisbane, QLD 4072, Australia. Electronic address: t.huelsen@uq.edu.au.
3 Environmental Biotechnology Group, Department of Geosciences, University of Tübingen, 72076 Tübingen, Germany; AG Angenent, Max Planck Institute for Biology, 72076 Tübingen, Germany; Department of Biological and Chemical Engineering, Aarhus University, 8000 Aarhus C, Denmark. Electronic address: l.angenent@uni-tuebingen.de.