1. Department
of Environmental Engineering, Technical University of Denmark, Bygningstorvet B115, 2800 Kgs. Lyngby, Denmark
2. Veolia Water Technologies AB−AnoxKaldnes, Klosterängsvägen 11A, SE-226 47 Lund, Sweden
3. Department
of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark