1. Water Environment Technology, Department of Civil and Environmental Engineering, Chalmers University of Technology, Gothenburg, Sweden
2. Recycling and Waste Management, Renova AB, Gothenburg, Sweden
3. Department of Transport and Technology of Project and Processes, University of Cantabria, Santander, Spain
4. Environmental Technology, Biotechnology and Geochemistry Group, University of Oviedo, Mieres, Asturias, Spain