1. Institute of Thermodynamics, University of the Federal Armed Forces Hamburg, Holstenhofweg 85, 22049 Hamburg, Germany, GKSS Research Center Geesthacht, Institute of Coastal Research/Physical and Chemical Analysis, Max-Planck-Strasse, 21502 Geesthacht, Germany, and EADS Airbus GmbH, Water and Waste Systems, Kreetslag 10, 21129 Hamburg, Germany