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Comparative study on the removal of humic acids from drinking water by anodic oxidation and electro-Fenton processes: Mineralization efficiency and modelling

Paper ID Volume ID Publish Year Pages File Format Full-Text
44783 46353 2016 10 PDF Available
Title
Comparative study on the removal of humic acids from drinking water by anodic oxidation and electro-Fenton processes: Mineralization efficiency and modelling
Abstract

•First study on the removal of humic acids from water by electrochemical AOPs.•The main advantage of BDD anode is the complete mineralization of humic acids.•Carbon sponge cathode is a less suitable material due to adsorption of humic acids.•Adsorbed humic acids are subject to removal by OH produced in electro-Fenton.•Modelling of TOC removal by taking into account sorption and oxidation processes.

The management of natural organic matter in drinking water treatment plants is an important matter of concern. It can generate toxic disinfection by-products as well as decrease the efficiency of membrane filtration and oxidation processes. This is the first study that investigates the use of anodic oxidation (AO) and electro-Fenton (EF) for the removal of humic acids (HAs) from aqueous solutions. Both sorption and catalytic oxidation of HAs are assessed and discussed. These electrochemical advanced oxidation processes are based on the in situ production of hydroxyl radicals, a highly oxidizing agent. The EF process involves the use of carbon-based porous materials (carbon sponge) as cathode, leading to the fast adsorption of hydrophobic HAs. It has been observed that adsorbed HAs can react with hydroxyl radical produced in the bulk from Fenton’s reaction. Then, the release in the solution of more hydrophilic by-products from the oxidation of HAs leads to a rebound effect of the organic matter concentration. Therefore, the AO process using non-carbonaceous cathode materials appears to be more suitable for HAs removal. Using boron-doped diamond anode and stainless steel cathode, the mineralization efficiency of a HAs solution (TOC0 = 16.2 mg L−1) reached more than 99% after 7 h of AO treatment with a current intensity of 1000 mA. By considering both sorption and oxidation processes, this study proposed a new modelling approach to monitor TOC evolution during AO and EF processes.

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Keywords
AO, anodic oxidation; BDD, boron doped diamond; CS, carbon sponge; EAOPs, electrochemical advanced oxidation processes; EF, electro-Fenton; HAs, humic acids; HAads, humic acids adsorbed; HAhob, low or non-degraded humic acids; HAhob_ads, low or non-degrad
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Comparative study on the removal of humic acids from drinking water by anodic oxidation and electro-Fenton processes: Mineralization efficiency and modelling
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 194, 5 October 2016, Pages 32–41
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us