[1] Univ Valladolid, Dept Chem Engn & Environm Technol, Sch Ind Engn, Dr Mergelina S-N, E-47011 Valladolid, Spain
[2] Wageningen Univ, Subdept Environm Technol, POB 17, NL-6700 AA Wageningen, Netherlands
[3] KWR Watercycle Res Inst, POB 1072, NL-3430 BB Nieuwegein, Netherlands
[4] IHE Delft Inst Water Educ, Dept Environm Engn & Water Technol, Delft, Netherlands