1. Dept. of Civil Engineering; University of Granada; Campus De Fuentenueva, S/N Granada 18701 Spain
2. Inst. of Water Research, University of Granada; C/Ramón y Cajal, 4 Granada 18701 Spain
3. Dept. of Biotechnology; Technical University of Delft; Julianalaan 67 Delft 2628 BC The Netherlands