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Title: Oxone-promoted wet air oxidation of landfill leachates
Authors: Javier Rivas, F.
Beltrán, F.
Carvalho, F.
Alvarez, P.
Keywords: Landfill leachates
Air oxidation
Chemical oxygen
Issue Date: 16-Feb-2005
Publisher: American Chemical Society
Citation: Javier Rivas, F., Beltrán, F., Carvalho, F. & Alvarez, P. (2005). Oxone-promoted wet air oxidation of landfill leachates. Industrial & Engineering Chemistry Research, 44(4), 749-758.
Abstract: Landfill leachates of the city of Badajoz (in the southwest of Spain) have been treated by wet air oxidation at high temperature (180-270 °C) and pressure (40-70 atm). Typical operating variables such as temperature and oxygen partial pressure have been investigated with no effect of any being found and moderate to low chemical oxygen demand conversions (20-30% depending on initial COD concentration). Initial pH shows a positive influence when acidic conditions are used. Addition of hydrogen peroxide (0.01 M) as a hydroxyl radical promoter is able to provide an additional 15% increase in the final COD removal achieved. If a sulfate radical promoter is used (i.e., Oxone) the process is significantly improved, with COD conversions in the range 60-80%, also depending on the initial COD of the leachates. A first attempt to comprehend the chemistry of this oxidizing system suggests an instantaneous decomposition of Oxone that initiates the radical chain also involving hydroxyl and organic radicals.
Peer reviewed: yes
ISSN: 1520-5045
Publisher version:
Appears in Collections:D-TCA - Artigos em revistas indexadas à WoS/Scopus

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