NickelMaghrebV1, Main, Exploration, bibRecord, 000279

Influence of leaching conditions on the release kinetics of lead, chromium and nickel from solidified/stabilized cementitious materials

Identifieur interne : 000279 ( Main/Exploration ); précédent : 000278; suivant : 000280

Influence of leaching conditions on the release kinetics of lead, chromium and nickel from solidified/stabilized cementitious materials

Auteurs : K. Moussaceb [Algérie] ; A. Ait-Mokhtar [France] ; D. Merabet [Algérie]

Source :

Environmental technology [ 0959-3330 ] ; 2012.

RBID : Pascal:13-0059935

Descripteurs français

Pascal (Inist)
- Lixiviation, Cinétique, Echelle laboratoire, Solidification, Ciment, pH, Polluant, Chlorure, Sulfate, Neutralisation, Eau interstitielle, Condition aux limites, Lessivat, Régime saturation, Construction monolithe, Saturation, Stabilisation, Métal lourd, Phénomène transport, Traitement déchet.
Wicri :
- topic : Ciment, Polluant, Métal lourd.

English descriptors

KwdEn :
- Boundary condition, Cement, Chlorides, Chromium (isolation & purification), Construction Materials, Heavy metal, Interstitial water, Kinetics, Laboratory scale, Leachate, Lead (isolation & purification), Lixiviation, Microscopy, Electron, Scanning, Monolithic construction, Neutralization, Nickel (isolation & purification), Pollutant, Saturation, Saturation state, Solidification, Stabilization, Sulfates, Transport process, Waste treatment, pH.
MESH :
- chemical , isolation & purification : Chromium, Lead, Nickel.
- Construction Materials, Kinetics, Microscopy, Electron, Scanning.

Abstract

In this work, we investigate, on a laboratory scale, the influence of the leaching conditions on the release of various chemical elements from a cementitious material obtained by solidification of PbO, Ni₂O₃ and Cr₂O₃ with blended cement (CEMII- B32.5, according to European Standards). The pH effects on the pollutants release and the composition of the initial pore solution (target elements: chloride, sulfate, sodium, potassium, calcium, lead, chromium and nickel) were assessed through an experimental procedure consisting of two equilibrium leaching tests [the acid neutralization capacity (ANC) and the pore water (PW) tests] and the maximum mobile fraction (MMF) text. Samples of the same material were submitted in parallel to dynamic leaching tests in order to assess the influence of the boundary conditions (instantaneous liquid/solid (L/S) ratio, solution renewal) on the leaching kinetics of the target elements. The comparison criteria were the leachate saturation state, the released cumulative quantities and the leaching flux. Generally, leachate quantities obtained by the ANC, PW and MMF tests were important. However, the lowest released amount was observed for the monolith leaching test, and leachate saturation slowed down the dynamic release. Finally, experimental results highlighted another important parameter: the influence of the liquid/solid contact type on leaching kinetics.

Affiliations:

Le document en format XML

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<front><div type="abstract" xml:lang="en">In this work, we investigate, on a laboratory scale, the influence of the leaching conditions on the release of various chemical elements from a cementitious material obtained by solidification of PbO, Ni<sub>2</sub>
O<sub>3</sub>
 and Cr<sub>2</sub>
O<sub>3</sub>
 with blended cement (CEMII- B32.5, according to European Standards). The pH effects on the pollutants release and the composition of the initial pore solution (target elements: chloride, sulfate, sodium, potassium, calcium, lead, chromium and nickel) were assessed through an experimental procedure consisting of two equilibrium leaching tests [the acid neutralization capacity (ANC) and the pore water (PW) tests] and the maximum mobile fraction (MMF) text. Samples of the same material were submitted in parallel to dynamic leaching tests in order to assess the influence of the boundary conditions (instantaneous liquid/solid (L/S) ratio, solution renewal) on the leaching kinetics of the target elements. The comparison criteria were the leachate saturation state, the released cumulative quantities and the leaching flux. Generally, leachate quantities obtained by the ANC, PW and MMF tests were important. However, the lowest released amount was observed for the monolith leaching test, and leachate saturation slowed down the dynamic release. Finally, experimental results highlighted another important parameter: the influence of the liquid/solid contact type on leaching kinetics.</div>
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Serveur d'exploration sur le nickel au Maghreb

Influence of leaching conditions on the release kinetics of lead, chromium and nickel from solidified/stabilized cementitious materials

Influence of leaching conditions on the release kinetics of lead, chromium and nickel from solidified/stabilized cementitious materials

Source :

Descripteurs français

English descriptors

Abstract

Links toward previous steps (curation, corpus...)

Le document en format XML

Pour manipuler ce document sous Unix (Dilib)

Pour mettre un lien sur cette page dans le réseau Wicri

	Serveur d'exploration sur le nickel au Maghreb
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