title: Removal of 1,4-dioxane from industrial wastewaters: routes of decomposition under different operational conditions to determine the ozone oxidation capacity.
abstract: This paper denotes the importance of operational parameters for the feasibility of ozone (O3) oxidation for the treatment of wastewaters containing 1,4-dioxane. Results show that O3 process, which has formerly been considered insufficient as a sole treatment for such wastewaters, could be a viable treatment for the degradation of 1,4-dioxane at the adequate operation conditions. The treatment of both synthetic solution of 1,4-dioxane and industrial wastewaters, containing 1,4-dioxane and 2-methyl-1,3-dioxolane (MDO), showed that about 90% of chemical oxygen demand can be removed and almost a total removal of 1,4-dioxane and MDO is reached by O3 at optimal process conditions. Data from on-line Fourier transform infrared spectroscopy provides a good insight to its different decomposition routes that eventually determine the viability of degrading this toxic and hazardous compound from industrial waters. The degradation at pH>9 occurs faster through the formation of ethylene glycol as a primary intermediate; whereas the decomposition in acidic conditions (pH<5.7) consists in the formation and slower degradation of ethylene glycol diformate.
authors.affiliation: Department of Chemical Engineering, Universidad Complutense de Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain. Electronic address: hbarndok@quim.ucm.es.
authors.forename: Helen
authors.initials: H
authors.lastname: Barndõk
authors.affiliation: Department of Chemical Engineering, Universidad Complutense de Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain. Electronic address: lcortijo@quim.ucm.es.
authors.forename: Luis
authors.initials: L
authors.lastname: Cortijo
authors.affiliation: Department of Chemical Engineering, Universidad Complutense de Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain. Electronic address: dhermosilla@quim.ucm.es.
authors.forename: Daphne
authors.initials: D
authors.lastname: Hermosilla
authors.affiliation: Department of Chemical Engineering, Universidad Complutense de Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain. Electronic address: cnegro@quim.ucm.es.
authors.forename: Carlos
authors.initials: C
authors.lastname: Negro
authors.affiliation: Department of Chemical Engineering, Universidad Complutense de Madrid, Avda. Complutense, s/n, 28040 Madrid, Spain. Electronic address: ablanco@quim.ucm.es.
authors.forename: Angeles
authors.initials: A
authors.lastname: Blanco
mesh_terms: D001639:Bicarbonates / Q000737:chemistry; D004146:Dioxanes / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007220:Industrial Waste; D010084:Oxidation-Reduction; D010126:Ozone / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry
chemical_list: D001639:Bicarbonates; D004146:Dioxanes; D006861:Hydrogen Peroxide; D007220:Industrial Waste; D010126:Ozone; D062065:Wastewater; C025223:1,4-dioxane
keywords: 1,4-Dioxane; Chemical industry; FTIR spectroscopy; Ozone; Wastewater treatment