Journal
CHEMOSPHERE
Volume 73, Issue 5, Pages 745-750Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2008.06.028
Keywords
Chemical oxidation; Fenton reagent; Wastewater treatment; Humate; Humic substances
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This paper describes results of treatability studies of the effect of humic substances (humate, HS, at the concentration 500-5000 mg l(-1)) on the Fenton (Fe (2+)/H2O2) treatment of industrial wastewater at pH 3.5 and 7.0. Without humate, the removal of all contaminants was significantly higher at pH 3.5 than at pH 7. At pH 7.0, the removal of all compounds in the presence of HS (3000 mg l(-1)) was comparable to that at pH 3.5 without HS. At pH 3.5, humate had no effect on the removal of arsenic, thiocyanate and cyanide, but the removal of all organic compounds (phenol, 2,4-dimethylphenol, benzene, toluene, o-xylene, m- & pxylene and dichloromethane) was significantly inhibited. Mechanisms of the processes are discussed. It is suggested that, in the presence of HS, acidification of the treated wastewater may not only be unnecessary but it can even hinder the degradation of organic pollutants. (c) 2008 Elsevier Ltd. All rights reserved.
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