The International Conference on Environmental Engineering and Management, ICEEM 2011, at its 6th Edition, represents a scientific event that is dedicated to the promotion and dissemination of the scientific results obtained at national and international level in the fields of environmental engineering, environmental management and sustainability. The event was initiated and organized every 2 years, since 2002, by the Department of Environmental Engineering and Management, Faculty of Chemical Engineering and Environmental Protection from the �Gheorghe Asachi� Technical University of Iasi, aiming from the very beginning to bring together international researchers, academics, professionals and students, activating in the fields of environmental engineering and management and to support knowledge exchange and dissemination of specific research and educational programs. The conference language was exclusively English for all the ICEEM editions.