A comprehensive review on green perspectives of electrocoagulation integrated with advanced processes for effective pollutants removal from water environment

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Othmani, A, Kadier, A, Singh, R, Igwegbe, CA, Bouzid, M, Aquatar, MO, Khanday, WA, Bote, ME, Damiri, F, Gökkuş, Ö and Sher, F ORCID: https://orcid.org/0000-0003-2890-5912, 2022. A comprehensive review on green perspectives of electrocoagulation integrated with advanced processes for effective pollutants removal from water environment. Environmental Research, 215 (Pt 1): 114294. ISSN 0013-9351

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Official URL: https://doi.org/10.1016/j.envres.2022.114294

Abstract

The rapidly expanding global energy demand is forcing a release of regulated pollutants into water that is threatening human health. Among various wastewater remediating processes, electrocoagulation (EC) has scored a monumental success over conventional processes because it combines coagulation, sedimentation, floatation and electrochemical oxidation processes that can effectively decimate numerous stubborn pollutants. The EC processes have gained some attention through various academic and industrial publications, however critical evaluation of EC processes, choices of EC processes for various pollutants, process parameters, mechanisms, commercial EC technologies and performance enhancement via other degradation processes (DPs) integration have not been comprehensively covered to date. Therefore, the major objective of this paper is to provide a comprehensive review of 20 years of literature covering EC fundamentals, key process factors for a reactor design, process implementation, current challenges and performance enhancement by coupling EC with pivotal pollutant DPs including, electro/photo-Fenton (E/P–F), photocatalysis, sono-chemical treatment, ozonation, indirect electrochemical/advanced oxidation (AO), and biosorption that have substantially reduced metals, pathogens, toxic compound BOD, COD, colors in wastewater. The results suggest that the optimum treatment time, current density, pulse frequency, shaking speed and spaced electrode improve the pollutants removal efficiency. An elegant process design can prevent electrode passivation which is a critical limitation of EC technology. EC coupling (up or downstream) with other DPs has resulted in the removal of organic pollutants and heavy metals with a 20% improved efficiency by EC-EF, removal of 85.5% suspended solid, 76.2% turbidity, 88.9% BOD, 79.7% COD and 93% color by EC-electroflotation, 100% decolorization by EC-electrochemical-AO, reduction of 78% COD, 81% BOD, 97% color by EC-ozonation and removal of 94% ammonia, 94% BOD, 95% turbidity, >98% phosphorus by aerated EC and peroxicoagulation. The major wastewater purification achievements, future potential and challenges are described to model the future EC integrated systems.

Item Type:	Journal article
Publication Title:	Environmental Research
Creators:	Othmani, A., Kadier, A., Singh, R., Igwegbe, C.A., Bouzid, M., Aquatar, M.O., Khanday, W.A., Bote, M.E., Damiri, F., Gökkuş, Ö. and Sher, F.
Publisher:	Elsevier BV
Date:	December 2022
Volume:	215
Number:	Pt 1
ISSN:	0013-9351
Identifiers:	Number Type 10.1016/j.envres.2022.114294 DOI S0013935122016218 Publisher Item Identifier 1601659 Other
Rights:	Copyright: © 2022 The Authors. Published by Elsevier Inc. This is an open access article distributed under the terms of the Creative Commons CC-BY license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Divisions:	Schools > School of Science and Technology
Record created by:	Linda Sullivan
Date Added:	26 Sep 2022 12:53
Last Modified:	26 Sep 2022 12:53
URI:	https://irep.ntu.ac.uk/id/eprint/47121