Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments

Dredging sediments can be implemented as primary resources in several civil engineering applications, on the condition that the release of anthropogenic compounds meets environmental requirements. The remediation of sedimentary wastes constitutes therefore, a key step before valorization considerati...

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Autores principales:	Adoum Mahamat Ahmat, Walid Maherzi, Claude Le Milbeau, Mahfoud Benzerzour, Nor-Edine Abriak
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	sediment zinc removal hydraulic binders red muds adsorption Mineralogy QE351-399.2
Acceso en línea:	https://doaj.org/article/5b5538c7f33940b899645efde9b455a5
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spelling	oai:doaj.org-article:5b5538c7f33940b899645efde9b455a52021-11-25T18:26:08ZModified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments10.3390/min111111892075-163Xhttps://doaj.org/article/5b5538c7f33940b899645efde9b455a52021-10-01T00:00:00Zhttps://www.mdpi.com/2075-163X/11/11/1189https://doaj.org/toc/2075-163XDredging sediments can be implemented as primary resources in several civil engineering applications, on the condition that the release of anthropogenic compounds meets environmental requirements. The remediation of sedimentary wastes constitutes therefore, a key step before valorization consideration in circular economy schemes. This study focused on Zn removal from clayey river sediments dredged in northern France (Lille, Saint-Omer and Aire-Sur-La Lys) using a Thermo-Evolved Red Mud (TERM) and a Slag Based Hydraulic Binder (SBHB). The first step consisted in investigating Zn-trapping mechanisms prior to TERM and SBHB application as Zn-stabilizers. Results underlined poorer metal retention within the most organic sediment (high fatty acids and polycyclic aromatic molecules concentrations), emphasizing the minor role of the organic fraction typology during Zn-trapping. The pollutant displayed its best binding yields within the sediment with the highest interstitial pH and specific areas, which stressed out the preponderant influence of alkalinization ability and particles size distribution. In a second step, the spiked sediments were treated with TERM and SBHB, which resulted in a substantial lowering of Zn release at 12% of stabilizer/sediment ratio. Even though the organic content role was not preeminent during the pollutant trapping, it appeared here influential as delays in removal efficiencies were observed for the most endowed sediment. Two preferential geochemical pathways were adopted during the remediation operations with significant promotive roles of basic background pH. Indeed, Zn removal with TERM consisted mainly in sorptive mechanisms involving exchanges with Ca and Mg ions, whereas binding onto SBHB was principally achieved through precipitation phenomena.Adoum Mahamat AhmatWalid MaherziClaude Le MilbeauMahfoud BenzerzourNor-Edine AbriakMDPI AGarticlesedimentzincremovalhydraulic bindersred mudsadsorptionMineralogyQE351-399.2ENMinerals, Vol 11, Iss 1189, p 1189 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	sediment zinc removal hydraulic binders red muds adsorption Mineralogy QE351-399.2
spellingShingle	sediment zinc removal hydraulic binders red muds adsorption Mineralogy QE351-399.2 Adoum Mahamat Ahmat Walid Maherzi Claude Le Milbeau Mahfoud Benzerzour Nor-Edine Abriak Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
description	Dredging sediments can be implemented as primary resources in several civil engineering applications, on the condition that the release of anthropogenic compounds meets environmental requirements. The remediation of sedimentary wastes constitutes therefore, a key step before valorization consideration in circular economy schemes. This study focused on Zn removal from clayey river sediments dredged in northern France (Lille, Saint-Omer and Aire-Sur-La Lys) using a Thermo-Evolved Red Mud (TERM) and a Slag Based Hydraulic Binder (SBHB). The first step consisted in investigating Zn-trapping mechanisms prior to TERM and SBHB application as Zn-stabilizers. Results underlined poorer metal retention within the most organic sediment (high fatty acids and polycyclic aromatic molecules concentrations), emphasizing the minor role of the organic fraction typology during Zn-trapping. The pollutant displayed its best binding yields within the sediment with the highest interstitial pH and specific areas, which stressed out the preponderant influence of alkalinization ability and particles size distribution. In a second step, the spiked sediments were treated with TERM and SBHB, which resulted in a substantial lowering of Zn release at 12% of stabilizer/sediment ratio. Even though the organic content role was not preeminent during the pollutant trapping, it appeared here influential as delays in removal efficiencies were observed for the most endowed sediment. Two preferential geochemical pathways were adopted during the remediation operations with significant promotive roles of basic background pH. Indeed, Zn removal with TERM consisted mainly in sorptive mechanisms involving exchanges with Ca and Mg ions, whereas binding onto SBHB was principally achieved through precipitation phenomena.
format	article
author	Adoum Mahamat Ahmat Walid Maherzi Claude Le Milbeau Mahfoud Benzerzour Nor-Edine Abriak
author_facet	Adoum Mahamat Ahmat Walid Maherzi Claude Le Milbeau Mahfoud Benzerzour Nor-Edine Abriak
author_sort	Adoum Mahamat Ahmat
title	Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
title_short	Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
title_full	Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
title_fullStr	Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
title_full_unstemmed	Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments
title_sort	modified red muds and slag based hydraulic binders for zn removal: a matrix-spiking approach applied on clayey sediments
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/5b5538c7f33940b899645efde9b455a5
work_keys_str_mv	AT adoummahamatahmat modifiedredmudsandslagbasedhydraulicbindersforznremovalamatrixspikingapproachappliedonclayeysediments AT walidmaherzi modifiedredmudsandslagbasedhydraulicbindersforznremovalamatrixspikingapproachappliedonclayeysediments AT claudelemilbeau modifiedredmudsandslagbasedhydraulicbindersforznremovalamatrixspikingapproachappliedonclayeysediments AT mahfoudbenzerzour modifiedredmudsandslagbasedhydraulicbindersforznremovalamatrixspikingapproachappliedonclayeysediments AT noredineabriak modifiedredmudsandslagbasedhydraulicbindersforznremovalamatrixspikingapproachappliedonclayeysediments
_version_	1718411133785735168

Modified Red Muds and Slag Based Hydraulic Binders for Zn Removal: A Matrix-Spiking Approach Applied on Clayey Sediments

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