Gestión y tratamiento de agua | Water management and treatment FuturEnviro | Abril April 2019 www.futurenviro.es 34 difference is the final turbidity of the treated water, around 20-30 NTU in the case of precipitation floatation and 1-5 NTU in ionic floatation. This difference is explained by the fact that it is impossible to float all metal hydroxides with the former technique, while with ionic floatation, the minimum solubility of the metal is not reached. This will determine the need of a subsequent filtration step. The floatation techniques studied have competitive advantages, which include a reduction in the volume of chemical reagents used in treatment, and the selective separation of metals present in the water. This would give rise to an additional reduction in costs and an increase in the overall sustainability of the process. López, L.1, Ferrer O.1*, Ferrero, E.1, Malfeito, J.1 1 Departamento I+D+i, ACCIONA Agua S.A.U., Parc de Negocis Mas Blau II, Avda. de les Garrigues, 22, 08820 El Prat de Llobregat (Barcelona), España Department of R&D&i, ACCIONA Agua S.A.U
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