Abstract
A novel arrangement for an electro-Fenton reactor aimed to treat neutral wastewater is presented. The arrangement consists on three-compartments in series, two of them packed with a cation exchange resin and one positioned between these, containing a polarized activated carbon column where the electrochemical generation of the Fenton reagent takes place. While the hydroxyl radicals electrochemically produced in-situ, react with the pollutant species adsorbed on the activated carbon cathode, the resin compartments administrate and collect the iron cation and the hydrated proton species in alternating flow direction cycles. The resulting process is a system that does not require acid or iron chemical addition to the process while at the same time, renders decontaminated water free of iron-dissolved species at neutral pH. The proposed electrochemical reactor arrangement is therefore the basis for the design of commercially viable electro-Fenton reactors in which the addition and subsequent removal of acid and iron chemicals is avoided; two of the currently most limiting features for the development of electro-Fenton technology for treating wastewater.
Highlights
IntroductionIn spite of its potential electro-Fenton technologies are still seriously limited by high cost features such as the need to add and maintain appropriate ionic Fe concentrations in an acidic medium and the requirement to remove the iron species and neutralize the acid of the aqueous effluent after treatment (Brillas and Martínez-Huitle, 2009; Nidheesh and Gandhimathi, 2012; Luo et al, 2014)
It is hoped that this reactor arrangement could constitute the basis for the development of efficient and cost effective electro-Fenton water treatment processes well suited for a wide variety of polluted wastewaters (Ma et al, 2016; Roth et al, 2016; Chmayssem et al, 2017)
This section of the reactor performs two simultaneous functions. It works as the adsorbent material for pollutants flowing across the packed Activated carbon (AC) and on the other, as the region in which the pollutant is oxidized at the AC-solution interphase either by the HO radicals produced by the electro-Fenton reaction (see Eq (2)), or by direct electro-oxidation (Sires et al, 2014; Perez et al, 2017)
Summary
In spite of its potential electro-Fenton technologies are still seriously limited by high cost features such as the need to add and maintain appropriate ionic Fe concentrations in an acidic medium and the requirement to remove the iron species and neutralize the acid of the aqueous effluent after treatment (Brillas and Martínez-Huitle, 2009; Nidheesh and Gandhimathi, 2012; Luo et al, 2014). In this communication, we are reporting a preliminary study on a novel reactor arrangement designed to overcome these important drawbacks. It is hoped that this reactor arrangement could constitute the basis for the development of efficient and cost effective electro-Fenton water treatment processes well suited for a wide variety of polluted wastewaters (Ma et al, 2016; Roth et al, 2016; Chmayssem et al, 2017)
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