title: Oil removal from produced water by conjugation of flotation and photo-Fenton processes.
abstract: The present work investigates the conjugation of flotation and photo-Fenton techniques on oil removal performance from oilfield produced water. The experiments were conducted in a column flotation and annular lamp reactor for induced air flotation and photodegradation steps, respectively. A nonionic surfactant was used as a flotation agent. The flotation experimental data were analyzed in terms of a first-order kinetic rate model. Two experimental designs were employed to evaluate the oil removal efficiency: fractional experimental design and central composite rotational design (CCRD). Overall oil removal of 99% was reached in the optimum experimental condition after 10 min of flotation followed by 45 min of photo-Fenton. The results of the conjugation of induced air flotation and photo-Fenton processes allowed meeting the wastewater limits established by the legislations for disposal.
authors.affiliation: Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil.
authors.forename: Syllos Santos
authors.initials: SS
authors.lastname: da Silva
authors.affiliation: Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil.
authors.forename: Osvaldo
authors.initials: O
authors.lastname: Chiavone-Filho
authors.affiliation: Department of Chemical Engineering, Federal University of Rio Grande do Norte, Natal 59072-970, Brazil.
authors.forename: Eduardo Lins
authors.initials: EL
authors.lastname: de Barros Neto
authors.affiliation: Department of Chemical Engineering, Federal University of Santa Maria, Santa Maria 97105-900, Brazil. Electronic address: efoletto@gmail.com.
authors.forename: Edson Luiz
authors.initials: EL
authors.lastname: Foletto
mesh_terms: D019652:Extraction and Processing Industry / Q000379:methods*; D060587:Groundwater / Q000737:chemistry*; D006861:Hydrogen Peroxide; D007501:Iron; D007700:Kinetics; D008956:Models, Chemical; D010578:Petroleum / Q000032:analysis*; D010782:Photolysis; D013501:Surface-Active Agents; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*
chemical_list: C045076:Fenton's reagent; D010578:Petroleum; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D006861:Hydrogen Peroxide; D007501:Iron
keywords: Flotation; Integration; Oilfield; Photo-Fenton; Produced water