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Colour removal of three reactive dyes by UV light exposure after electrochemical treatment
Riera Torres, Miquel Antoni; Gutiérrez Bouzán, María Carmen
Universitat Politècnica de Catalunya. Institut d'Investigació Tèxtil i Cooperació Industrial de Terrassa; Universitat Politècnica de Catalunya. Departament d'Enginyeria Tèxtil i Paperera; Universitat Politècnica de Catalunya. ENMA - Enginyeria del Medi Ambient
This study applies UV light irradiation after a low current density electrochemical treatment to degrade reactive dyes to remove wastewater colour. The combination of these two techniques improves the quality of the treated effluent with respect to only an electrochemical treatment. Synthetic dyeing effluents containing a reactive dye (C.I. Reactive Orange 4, C.I. Reactive Black 5 or Procion Navy H-EXL) and Na2SO4 were studied. Ti/Pt oxides electrodes and UV irradiation lamp (6 W, 254 nm maximum emission) were used. Kinetic constants of the UV irradiation step were calculated. The influence of chloride ion at 3 and 6 mA/cm2 was evaluated. Results showed that, with a very small Cl- concentration (in the order of the net water content) the combined techniques provided full decolourization. The possible presence of 25 organic halogenated compounds was studied by Gas Chromatography-Mass Spectrophotometry (GCMS). Only four of them were detected after the electrochemical treatment at low intensity, mainly chloroform. Its concentration was found to be highly dependent of the Cl- concentration, being much lower when reducing the amount of chloride ion. In all cases, the chloroform concentration was dramatically reduced by further UV irradiation which destroyed it up to a 75%
Peer Reviewed
Àrees temàtiques de la UPC::Enginyeria tèxtil ::Impacte ambiental
Àrees temàtiques de la UPC::Enginyeria tèxtil ::Fabricació tèxtil::Tintura
Indústria tèxtil -- Contaminació
Indústria tèxtil -- Residus
Aigües residuals -- Depuració -- Eliminació del color
Raigs ultraviolats -- Aspectes ambientals

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