Effect of biogenic jarosite on the bio-immobilization of toxic elements from sulfide tailings.
Bio-immobilization
Heavy metals
Jarosite
Passivation layer
Tailings
Journal
Chemosphere
ISSN: 1879-1298
Titre abrégé: Chemosphere
Pays: England
ID NLM: 0320657
Informations de publication
Date de publication:
Nov 2020
Nov 2020
Historique:
received:
15
12
2019
revised:
29
05
2020
accepted:
01
06
2020
entrez:
19
9
2020
pubmed:
20
9
2020
medline:
30
9
2020
Statut:
ppublish
Résumé
The discharge of toxic elements from tailings soils in the aquatic environments occurs chiefly in the presence of indigenous bacteria. The biotic components may interact in the opposite direction, leading to the formation of a passivation layer, which can inhibit the solubility of the elements. In this work, the influence of jarosite on the bio-immobilization of toxic elements was studied by native bacteria. In batch experiments, the bio-immobilization of heavy metals by an inhibitory layer was examined in the different aquatic media using pure cultures of Acidithiobacillus ferrooxidans and Acidithiobacillus thiooxidans. A variety of analyses also investigated the mechanisms of metals bio-immobilization. Among different tests, the highest metal solubility yielded 99% Mn, 91% Cr, 95% Fe, and 78% Cu using A. ferrooxidans in 9KFe medium after ten days. After 22 days, these percentages decreased down to 30% Mn and about 20% Cr, Fe, and Cu, likely due to metal immobilization by biogenic jarosite. The formation of jarosite was confirmed by an electron probe micro-analyzer (EPMA), X-ray diffraction (XRD), and scanning electron microscope (SEM). The mechanisms of metal bio-immobilization by biogenic jarosite from tailings soil confirmed three main steps: 1) the dissolution of metal sulfides in the presence of Acidithiobacillus bacteria; 2) the nucleation of jarosite on the surface of sulfide minerals; 3) the co-precipitation of dissolved elements with jarosite during the bio-immobilization process, demonstrated by a structural study for jarosite. Covering the surface of soils by the jarosite provided a stable compound in the acidic environment of mine-waste.
Identifiants
pubmed: 32947659
pii: S0045-6535(20)31481-8
doi: 10.1016/j.chemosphere.2020.127288
pii:
doi:
Substances chimiques
Ferric Compounds
0
Hazardous Substances
0
Metals, Heavy
0
Minerals
0
Sulfates
0
Sulfides
0
jarosite
0
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
127288Informations de copyright
Copyright © 2020 Elsevier Ltd. All rights reserved.
Déclaration de conflit d'intérêts
Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.