title: Coagulation-flocculation sequential with Fenton or Photo-Fenton processes as an alternative for the industrial textile wastewater treatment.
abstract: In this study, the industrial textile wastewater was treated using a chemical-based technique (coagulation-flocculation, C-F) sequential with an advanced oxidation process (AOP: Fenton or Photo-Fenton). During the C-F, Al2(SO4)3was used as coagulant and its optimal dose was determined using the jar test. The following operational conditions of C-F, maximizing the organic matter removal, were determined: 700 mg/L of Al2(SO4)3at pH = 9.96. Thus, the C-F allowed to remove 98% of turbidity, 48% of Chemical Oxygen Demand (COD), and let to increase in the BOD5/COD ratio from 0.137 to 0.212. Subsequently, the C-F effluent was treated using each of AOPs. Their performances were optimized by the Response Surface Methodology (RSM) coupled with a Box-Behnken experimental design (BBD). The following optimal conditions of both Fenton (Fe2+/H2O2) and Photo-Fenton (Fe2+/H2O2/UV) processes were found: Fe2+concentration = 1 mM, H2O2dose = 2 mL/L (19.6 mM), and pH = 3. The combination of C-F pre-treatment with the Fenton reagent, at optimized conditions, let to remove 74% of COD during 90 min of the process. The C-F sequential with Photo-Fenton process let to reach 87% of COD removal, in the same time. Moreover, the BOD5/COD ratio increased from 0.212 to 0.68 and from 0.212 to 0.74 using Fenton and Photo-Fenton processes, respectively. Thus, the enhancement of biodegradability with the physico-chemical treatment was proved. The depletion of H2O2was monitored during kinetic study. Strategies for improving the reaction efficiency, based on the H2O2evolution, were also tested.
authors.affiliation: GIPAB: Grupo de Investigación en Procesos Ambientales, Departamento de Ingeniería de Procesos, Universidad EAFIT, Carrera 49 #7 sur 50, Medellín, Colombia. Electronic address: egil@eafit.edu.co.
authors.forename: Edison
authors.initials: E
authors.lastname: GilPavas
authors.affiliation: Grupo de Investigación en Procesos Reactivos Intensificados con Separación y Materiales Avanzados - PRISMA, Departamento de Física y Química, Facultad de Ciencias Exactas y Naturales, Sede Manizales, Campus La Nubia, Km 9 Vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Caldas, Colombia.
authors.forename: Izabela
authors.initials: I
authors.lastname: Dobrosz-Gómez
authors.affiliation: Grupo de Investigación en Procesos Reactivos Intensificados con Separación y Materiales Avanzados - PRISMA, Departamento de Ingeniería Química, Facultad de Ingeniería y Arquitectura, Universidad Nacional de Colombia, Sede Manizales, Campus La Nubia, Km 9 Vía al Aeropuerto la Nubia, Apartado Aéreo 127, Manizales, Caldas, Colombia.
authors.forename: Miguel Ángel
authors.initials: MÁ
authors.lastname: Gómez-García
mesh_terms: D005427:Flocculation; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D010084:Oxidation-Reduction; D013784:Textiles; D014865:Waste Disposal, Fluid; D062065:Wastewater; D014874:Water Pollutants, Chemical
chemical_list: D006861:Hydrogen Peroxide; D007220:Industrial Waste; D007501:Iron; D062065:Wastewater; D014874:Water Pollutants, Chemical
keywords: Advanced oxidation processes; Chemical coagulation; Fenton; Industrial textile wastewater; Photo-Fenton