Abstract
The removal by electrochemical treatment in batch of humic acids (HA) extracted from leonardite has been analyzed using aluminum electrodes at 25°C and neutral pH, under galvanostatic conditions. HA removal, inferred from UV-Vis spectra and total organic carbon determination, occurred within few minutes of treatment under the experimental conditions tested, and no electrode passivation was observed. The removal rate increased with NaCl concentration and electric current density. Our data indicate that energy consumption per unit weight of HA removed can be significantly reduced by operating at low current density under galvanostatic conditions and/or high salt concentration, thus confirming electrochemical treatment as a powerful technology for wastewater treatment.
Highlights
Humic substances (HS) are formed in nature by biological decomposition of organic matter, plants [1] and are an important fraction of the biologically recalcitrant material from landfill leachates [2]
We investigated electrochemical removal of humic acids with focus on the effect of electric current density and NaCl concentration on the energy requirement
A sample of leonardite was purchased from Biotron (Italy) and used as a source for humic acid (HA) extraction by basic/acid treatment according to the procedure reported in former work [18], total organic carbon of the Humic acids (HA) sample 45%
Summary
Humic substances (HS) are formed in nature by biological decomposition of organic matter, plants [1] and are an important fraction of the biologically recalcitrant material from landfill leachates [2]. We investigated electrochemical removal of humic acids with focus on the effect of electric current density and NaCl concentration on the energy requirement.
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