10-Comparative study of the destruction of polychlorinated dibenzo-p-dioxins.pdf

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10-Comparative study of the destruction of polychlorinated dibenzo-p-dioxins.pdf

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10-Comparative study of the destruction of polychlorinated dibenzo-p-dioxins

Chemosphere 90 (2013) 132–138Contents lists available at SciVerse ScienceDirect Chemosphere journal homepage: www.elsevier .com/locate /chemosphereComparative study of the destruction of polychlorinated dibenzo-p-dioxins and dibenzofurans during Fenton and electrochemical oxidation of landfill leachates M. Vallejo, M.F. San Román, A. Irabien, I. Ortiz ? Dpto. Ingeniería Química y Q.I. ETSIIyT, Universidad de Cantabria, Avda. de los Castros, 39005 Santander, Spainh i g h l i g h t s Landfill leachates were treated using electrochemical and Fenton oxidation. Raw and oxidized samples were characterized for COD and PCDD/Fs concentration. Around 90% removal of COD was achieved with both AOPs after 180 min. Electrooxiation reduced the concentration of most PCDD/Fs and the sample toxicity. Fenton caused the formation of PCDD/Fs increasing the sample toxicity.0045-6535/$ - see front matter 2012 Elsevier Ltd. A /10.1016/j.chemosphere.2012.08.018 ? Corresponding author. Tel.: +34 942 201585; fax: E-mail address: ortizi@unican.es (I. Ortiz).g r a p h i c a l a b s t r a c ta r t i c l e i n f o Article history: Received 3 November 2011 Received in revised form 7 August 2012 Accepted 8 August 2012 Available online 30 August 2012 Keywords: Landfill leachate PCDD/Fs formation PCDD/Fs release Electrochemical oxidation Fenton oxidationa b s t r a c t Two advanced oxidation processes (AOPs) that provide a broad-spectrum contaminant destruction option were applied to the treatment of the leachates, namely electrochemical and Fenton oxidation. Despite the similar efficiency in the oxidation of major organic contaminants, approximately 90% reduc- tion of chemical oxygen demand after 180 min, our results showed a different behaviour of both AOPs in the oxidation of polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs). A concentration reduc- tion of 73% for 1,2,3,4,6,7,8-HpCDD and of 71% for OCDD was reached after 180 min of electrochemical oxidation and the total toxic e