title: Effect of EDTA, EDDS, NTA and citric acid on electrokinetic remediation of As, Cd, Cr, Cu, Ni, Pb and Zn contaminated dredged marine sediment.
abstract: In recent years, electrokinetic (EK) remediation method has been widely considered to remove metal pollutants from contaminated dredged sediments. Chelating agents are used as electrolyte solutions to increase metal mobility. This study aims to investigate heavy metal (HM) (As, Cd, Cr, Cu, Ni, Pb and Zn) mobility by assessing the effect of different chelating agents (ethylenediaminetetraacetic acid (EDTA), ethylenediaminedisuccinic acid (EDDS), nitrilotriacetic acid (NTA) or citric acid (CA)) in enhancing EK remediation efficiency. The results show that, for the same concentration (0.1 mol L(-1)), EDTA is more suitable to enhance removal of Ni (52.8 %), Pb (60.1 %) and Zn (34.9 %). EDDS provides effectiveness to increase Cu removal efficiency (52 %), while EDTA and EDDS have a similar enhancement removal effect on As EK remediation (30.5∼31.3 %). CA is more suitable to enhance Cd removal (40.2 %). Similar Cr removal efficiency was provided by EK remediation tests (35.6∼43.5 %). In the migration of metal-chelate complexes being directed towards the anode, metals are accumulated in the middle sections of the sediment matrix for the tests performed with EDTA, NTA and CA. But, low accumulation of metal contamination in the sediment was observed in the test using EDDS.
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre, 53 rue de Prony, 76600, Le Havre, France.|Laboratoire Morphodynamique Continentale et Côtière, UMR CNRS 6143 Université de Caen, 24, Rue des tilleuls, 14000, Caen, France.
authors.forename: Yue
authors.initials: Y
authors.lastname: Song
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre, 53 rue de Prony, 76600, Le Havre, France.
authors.forename: Mohamed-Tahar
authors.initials: MT
authors.lastname: Ammami
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre, 53 rue de Prony, 76600, Le Havre, France. ahmed.benamar@univ-lehavre.fr.
authors.forename: Ahmed
authors.initials: A
authors.lastname: Benamar
authors.affiliation: Laboratoire Morphodynamique Continentale et Côtière, UMR CNRS 6143 Université de Caen, 24, Rue des tilleuls, 14000, Caen, France.
authors.forename: Salim
authors.initials: S
authors.lastname: Mezazigh
authors.affiliation: Laboratoire Ondes et Milieux Complexes, UMR CNRS 6294, Université du Havre, 53 rue de Prony, 76600, Le Havre, France.
authors.forename: Huaqing
authors.initials: H
authors.lastname: Wang
mesh_terms: D019343:Citric Acid / Q000032:analysis* / Q000737:chemistry; D004492:Edetic Acid / Q000032:analysis* / Q000737:chemistry; D055664:Electrochemical Techniques; D052918:Environmental Restoration and Remediation; D019015:Geologic Sediments / Q000737:chemistry*; D019216:Metals, Heavy / Q000032:analysis* / Q000737:chemistry
chemical_list: D019216:Metals, Heavy; D019343:Citric Acid; D004492:Edetic Acid
keywords: Chelates; Dredged sediment; Electrokinetic; Heavy metals; Remediation; Removal