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Laboratory study of the Fenton and photo-Fenton oxidation treatment of LAS surfactant wastewater

The present study investigates the treatment of surfactant wastewater by the advanced oxidation processes of Fenton type. Synthetic solutions of linear alkylbenzene sulfonate (LAS), as a model compound commonly used in the formulation of detergents and present in industrial wastewaters, are investigated in this work. Experiments were conducted at LAS concentration of 100 mg dm-3. The mineralization of LAS synthetic wastewater has been studied using Fe2+/H2O2, Fe3+/H2O2, Fe2+/H2O2/UV and Fe3+/H2O2/UV processes. The extent of mineralization was determined on the basis of total organic carbon (TOC) measurements. Batch experiments for Fenton and photo-Fenton oxidation were performed in water jacked cylindrical reactor of 0.5 dm3 capacity. For photo-Fenton oxidation a low pressure mercury lamp (125 W) which emits at 254 nm was used. Experiments were carried out to investigate the optimal operational conditions of the process: H2O2 dosage, Fe2+ and Fe3+ concentration, optimal Fe2+/H2O2 and Fe3+/H2O2 ratios. Mineralization rates in all processes were determined. The mineralization of LAS expressed as a percentage of TOC remaining after the treatment (TOC/TOC0, %) was found to be: 53 % for Fe2+/H2O2, 51 % for Fe2+/H2O2/UV, 67 % for Fe3+/H2O2, and 48 % for Fe3+/H2O2/UV process with 0.005 M Fe2+ or Fe3+ dosage and 1 : 20, Fe2+ or Fe3+/ H2O2 molar ratio.

wastewater treatment, AOPs, Fenton type processes, UV irradiation

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