1. Egypt-Japan University of Science and Technology (E-JUST); Environmental Engineering Department; P.O. Box 179 New Borg El-Arab City-Postal Code 21934 Alexandria Egypt
2. Irstea, UR GERE, 17 av. de Cucillé, CS 64427, F-35044 Rennes, France; Université Européenne de Bretagne; F-35044 Rennes France