Abstract
Humic acids (HA) are a potential hazard to aquatic ecosystems and human health. Because biological treatment of contaminated water does not satisfactorily remove these pollutants, novel approaches are under evaluation. This work explores electrochemical oxidation of HA in aqueous solution in a lab-scale apparatus using platinum-coated titanium electrodes. We evaluated the effects of HA concentration, current density, chloride concentration and ionic strength on the rate of HA oxidation. The initial reaction rate method was used for determining the rate law of HA degradation. The results showed that the reaction rate was first-order relative to HA concentration, chloride concentration and current density. An appreciable effect of ionic strength was also observed, most likely due to the polyanionic character of HA. We propose a kinetic model that satisfactorily fits the experimental data.
Highlights
The removal of emerging and refractory pollutants from wastewater is a priority research area worldwide [1,2]
To therole roleof of concentration the kinetics of the we process, we investigated the of v on concentration for different current densities, while keeping the salt concentration constant
The results presented above indicate that ionic strength plays an active role in Humic acids (HA) electrochemical oxidation (EO)
Summary
The removal of emerging and refractory pollutants from wastewater is a priority research area worldwide [1,2]. Humic compounds are organic macromolecules deriving in nature from biological decomposition of organic matter [3]. Humic compounds are generally found in landfill leachate, as the organic fraction of mature leachate is mainly refractory humic substances [6,7,8], domestic sewage [9] and coking wastewater [10]. These are recalcitrant towards conventional biological treatment [11], thereby requiring additional treatment with other methods. HA impart undesirable color, taste, and odor to water [13] and are potentially harmful to aquatic ecosystems and human health [14,15,16]
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