1. Department of Environmental Engineering, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey
2. Swedish Centre for Resource Recovery, University of Borås, S-50190 Borås, Sweden
3. Department of Biotechnology, Inland Norway University of Applied Sciences, N-2317 Hamar, Norway
4. Department of Chemistry, Umeå University, SE-901 87 Umeå, Sweden