Integration of processes induced air flotation and photo-Fenton for treatment of residual waters contaminated with xylene.

Autor: da Silva SS; Departamento Engenharia Química, NUPEG, Universidade Federal do Rio Grande do Norte, Campus Universitário, Lagoa Nova, Natal 59066-800, RN, Brazil., Chiavone-Filho O, de Barros Neto EL, Nascimento CA
Jazyk: angličtina
Zdroj: Journal of hazardous materials [J Hazard Mater] 2012 Jan 15; Vol. 199-200, pp. 151-7. Date of Electronic Publication: 2011 Oct 29.
DOI: 10.1016/j.jhazmat.2011.10.070
Abstrakt: Produced water in oil fields is one of the main sources of wastewater generated in the industry. It contains several organic compounds, such as benzene, toluene, ethyl benzene and xylene (BTEX), whose disposal is regulated by law. The aim of this study is to investigate a treatment of produced water integrating two processes, i.e., induced air flotation (IAF) and photo-Fenton. The experiments were conducted in a column flotation and annular lamp reactor for flotation and photodegradation steps, respectively. The first order kinetic constant of IAF for the wastewater studied was determined to be 0.1765 min(-1) for the surfactant EO 7. Degradation efficiencies of organic loading were assessed using factorial planning. Statistical data analysis shows that H(2)O(2) concentration is a determining factor in process efficiency. Degradations above 90% were reached in all cases after 90 min of reaction, attaining 100% mineralization in the optimized concentrations of Fenton reagents. Process integration was adequate with 100% organic load removal in 20 min. The results of the integration of the IAF with the photo-Fenton allowed to meet the effluent limits established by Brazilian legislation for disposal.
(Copyright © 2011 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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