title: Comparative study of flotation techniques for the treatment of liquid effluents.
abstract: This work aimed to study the performance of three different induced air flotation units (flotation column, flotation tank and centrifugal flotation in hydrocyclone) for the treatment of a synthetic dairy effluent. Under continuous operation, it was possible to achieve removal efficiencies of milky material in suspension up to 90%, both for the flotation column and the flotation tank units. Using the centrifugal flotation unit in hydrocyclone, it was possible to decrease up to 45% of all suspended material in the effluent, with a clarified flow rate approximately three times greater than those found for the previous flotation units. In the centrifugal flotation unit, better results were obtained for air flow rate-feed flow rate ratios (Q(air)/Q(L)) greater than 0.15, and for underflow-overflow ratios (Qu/Qo) lower than 1.0.
authors.affiliation: Departamento de Engenharia Química, Faculdade de Ciências Humanas de Aracruz, Rua Prof. Berilo Basílio dos Santos, 180 Centro, Aracruz, ES 29190-000, Brazil.
authors.forename: F P
authors.initials: FP
authors.lastname: Puget
authors.forename: M V
authors.initials: MV
authors.lastname: Melo
authors.forename: G
authors.initials: G
authors.lastname: Massarani
mesh_terms: D000388:Air; D000818:Animals; D002498:Centrifugation; D003612:Dairying; D008962:Models, Theoretical; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*