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This paper describes the results of the LIFE16 ENV/ES/000156 NEWEST project, which validated the use of Bewat natural coagulants derived from plant raw materials in four WWTPs in the Valencia Region, substituting the use of FeCl3 in two WWTPs with urban influent and two WWTPs with urban influent with an industrial component.
Most WWTPs use chemical precipitation to remove phosphorus. Chemical precipitation or coagulation is a process that destabilizes the charges of colloidal particles by neutralizing the forces that keep them apart by adding chemicals and applying energy through mixing. Chemical precipitation removes insoluble salts by sedimentation, carrying away phosphorus by adding an inorganic coagulant [1].
The most common metallic salts are ferric chloride, ferric sulphate, ferrous chloride and aluminum polychloride.
