1. Universitat Politècnica de València; Departamento de Ingeniería Textil y Papelera; Plaza Ferrándiz y Carbonell, 1 03801 -Alcoy Spain
2. Department of Environmental Engineering; Technical University of Crete, Polytechneioupolis; GR-73100 Chania Greece
3. Department of Chemical Engineering; University of Patras, Caratheodory 1; University Campus GR-26504 Patras Greece