1. Bundesanstalt für Materialforschung und -prüfung (BAM) Division 4.4 Thermochemical Residues Treatment and Resource Recovery Unter den Eichen 87 12205 Berlin Germany
2. Centre for Ecology & Hydrology Maclean Building, Benson Lane, Crowmarsh Gifford OX10 8BB Wallingford, Oxfordshire United Kingdom
3. University of South Australia Future Industries Institute Building X 5095 Mawson Lakes, South Australia Australia
4. Justus Liebig University Giessen Institute of Plant Nutrition (iFZ) Heinrich-Buff-Ring 26–32 35392 Giessen Germany