Title Aquatic biofilms : ecology, water quality and wastewater treatment / edited by Anna M. Romani, Institute of Aquatic Ecology, University of Girona, Girona, Spain, Helena Guasch, Institute of Aquatic Ecology, University of Girona, Girona, Spain and M. Dolors Balaguer, Laboratory of Chemical and Environmental Engineering (LEQUIA), Institute of the Environment, University of Girona, Girona, Spain.