1. Department of Environmental Engineering, Technical University of Denmark (DTU), Miljøvej 113, 2800 Kgs. Lyngby, Denmark
2. Department of Applied Mathematics and Computer Science, Technical University of Denmark, Richard Petersens Plads, Building 321, 2800 Kgs. Lyngby, Denmark and Department of Business Administration, Technology and Social Sciences, Luleå University of Technology, SE-97187, Luleå, Sweden
3. Department of Chemical Engineering, University of Bath, Claverton Down, Bath BA2 7AY, UK