Novel integrated electrodialysis/electro-oxidation process for the efficient degradation of 2,4-dichlorophenoxyacetic acid

Abstract

This work presents a novel approach of wastewater treatment technology that consists of a combined electrodialysis/electro-oxidation process, specially designed to allow increasing the efficiency in the oxidation of ionic organic pollutants contained in diluted waste. Respect to conventional electrolysis, the pollutant is simultaneously concentrated and oxidized, enhancing the performance of the cell due to the higher concentration achieved in the nearness of the anode. A proof of concept is tested with the ionic pesticide 2,4-D (2,4-dichlorophenoxyacetic acid) and results show that the efficiency of this new technology overcomes that electrolysis by more than double, regardless the supporting electrolyte used (either NaCl or NaSO). Moreover, the removal rate of 2,4-D when using NaCl was found to be more efficient, due to the best performance of the electrode material selected (DSA) towards the formation of oxidants in chloride supporting electrolyte. These results open the way for overcoming the efficiency limitations of electrochemical treatment processes for the treatment of solutions with low concentrated ionic pollutants.

Modified lead dioxide for organic wastewater treatment: Physicochemical properties and electrocatalytic activity

“…This herbicide belongs to the moderate toxicity class of pesticides. Methods for chemical, photocatalytic and photochemical oxidation 4,6 are used to mineralize 2,4-dichlorophenoxyacetic acid. Electrochemical conversion methods of 2,4-D are also actively used, such as reducing electrochemical dechlorination and direct electrochemical oxidation.…”

Effect of anion co-existence on ionic organic pollutants removal over Ca based layered double hydroxide

“…The objectives of this research are to (1) investigate the SDS removal behaviours from aqueous solution over CaAl-LDH-Cl with/without co-existing anions; and (2) understand the adsorption mechanism of SDS over this adsorbent in the presence of nitrate and sulphate ion.…”

“…Ionic organic compounds, especially ionic surfactants, are widely used in industrial processes and commercial products, such as colloid stabilization, metal treatments, mineral flotation, daily-used detergents and pesticides [1,2]. The ubiquitous and persistent presence of ionic surfactants in the environment directly threatens human and animals due to their allergenicity, toxicity, and hemolysis [3][4][5].…”

Competitive Anodic Oxidation of Methyl Paraben and Propylene Glycol: Keys to Understand the Process

“…This is because the concentration of pollutants has a critical influence on the performance of electrochemical treatment technologies, as most of them operate typically under diffusion control. Many efforts are being carried out in the recent years in order to deal with this limitation, including the combination of electrochemical technologies with concentration operations …”