1. Department of Chemical Engineering; University of Almería; 04120 Almería Spain
2. CIESOL; Joint Centre of the University of Almería-CIEMAT; 04120 Almería Spain
3. Plataforma Solar de Almería (CIEMAT); 04200 Tabernas, Almería Spain
4. Cranfield Water Science Institute; Cranfield University; Bedfordshire MK43 0AL UK