Bioleaching - A result of interfacial processes caused by extracellular polymeric substances (EPS)

K. Kinzler, T. Gehrke, J. Telegdi, W. Sand

Research output: Contribution to journalArticle

141 Citations (Scopus)

Abstract

Extracellular polymeric substances (EPS) seem to play a pivotal role in bioleaching - the winning of precious metals as well as acid rock drainage. For a better control of both processes structure and function of extracellular polymeric substances from leaching bacteria are of crucial importance. Our research focussed on Acidithibacillus ferrooxidans, the composition of its extracellular polymeric substances and further deduction of their function. The extracellular polymeric substances of Acidithiobacillus ferrooxidans consist mainly of neutral sugars and lipids. The functions of the extracellular polymeric substances of this leaching bacterium seem to be (i) to mediate attachment to a (metal) sulfide surface, (ii) to concentrate iron(III) ions by complexation through uronic acids or other residues at the mineral surface and, thus, allowing for an oxidative attack on the sulfide. Consequently, dissolution of the metal sulfide is enhanced, which may result in an acceleration of 20- to 100-fold over chemical leaching. Experiments were performed to elucidate the importance of the iron(III) ions complexed by extracellular polymeric substances for strain-specific differences in oxidative activity for pyrite. The preliminary data indicate that strains of Acidithiobacillus ferrooxidans, with a high amount of iron(III) ions in their extracellular polymeric substances, possess a higher oxidation activity than those with less iron(III) ions. These data provide new insight into the function of extracellular polymeric substances and the consequent advantage conferred to bacteria involved in bioleaching.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalHydrometallurgy
Volume71
Issue number1-2
DOIs
Publication statusPublished - Oct 2003

Fingerprint

Bioleaching
Sulfides
Iron
Ions
Leaching
iron
Bacteria
ion
leaching
sulfide
bacterium
Metals
Uronic Acids
Acids
acid
metal
Pyrites
precious metal
Precious metals
Complexation

Keywords

  • Acidithiobacillus ferrooxidans
  • Attachment
  • Biofilm
  • Bioleaching
  • Extracellular polymeric substances (EPS)
  • Iron(III) ions
  • Pyrite

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geotechnical Engineering and Engineering Geology

Cite this

Bioleaching - A result of interfacial processes caused by extracellular polymeric substances (EPS). / Kinzler, K.; Gehrke, T.; Telegdi, J.; Sand, W.

In: Hydrometallurgy, Vol. 71, No. 1-2, 10.2003, p. 83-88.

Research output: Contribution to journalArticle

@article{0fe09c4c92be4d70b1737cffa6371576,
title = "Bioleaching - A result of interfacial processes caused by extracellular polymeric substances (EPS)",
abstract = "Extracellular polymeric substances (EPS) seem to play a pivotal role in bioleaching - the winning of precious metals as well as acid rock drainage. For a better control of both processes structure and function of extracellular polymeric substances from leaching bacteria are of crucial importance. Our research focussed on Acidithibacillus ferrooxidans, the composition of its extracellular polymeric substances and further deduction of their function. The extracellular polymeric substances of Acidithiobacillus ferrooxidans consist mainly of neutral sugars and lipids. The functions of the extracellular polymeric substances of this leaching bacterium seem to be (i) to mediate attachment to a (metal) sulfide surface, (ii) to concentrate iron(III) ions by complexation through uronic acids or other residues at the mineral surface and, thus, allowing for an oxidative attack on the sulfide. Consequently, dissolution of the metal sulfide is enhanced, which may result in an acceleration of 20- to 100-fold over chemical leaching. Experiments were performed to elucidate the importance of the iron(III) ions complexed by extracellular polymeric substances for strain-specific differences in oxidative activity for pyrite. The preliminary data indicate that strains of Acidithiobacillus ferrooxidans, with a high amount of iron(III) ions in their extracellular polymeric substances, possess a higher oxidation activity than those with less iron(III) ions. These data provide new insight into the function of extracellular polymeric substances and the consequent advantage conferred to bacteria involved in bioleaching.",
keywords = "Acidithiobacillus ferrooxidans, Attachment, Biofilm, Bioleaching, Extracellular polymeric substances (EPS), Iron(III) ions, Pyrite",
author = "K. Kinzler and T. Gehrke and J. Telegdi and W. Sand",
year = "2003",
month = "10",
doi = "10.1016/S0304-386X(03)00176-2",
language = "English",
volume = "71",
pages = "83--88",
journal = "Hydrometallurgy",
issn = "0304-386X",
publisher = "Elsevier",
number = "1-2",

}

TY - JOUR

T1 - Bioleaching - A result of interfacial processes caused by extracellular polymeric substances (EPS)

AU - Kinzler, K.

AU - Gehrke, T.

AU - Telegdi, J.

AU - Sand, W.

PY - 2003/10

Y1 - 2003/10

N2 - Extracellular polymeric substances (EPS) seem to play a pivotal role in bioleaching - the winning of precious metals as well as acid rock drainage. For a better control of both processes structure and function of extracellular polymeric substances from leaching bacteria are of crucial importance. Our research focussed on Acidithibacillus ferrooxidans, the composition of its extracellular polymeric substances and further deduction of their function. The extracellular polymeric substances of Acidithiobacillus ferrooxidans consist mainly of neutral sugars and lipids. The functions of the extracellular polymeric substances of this leaching bacterium seem to be (i) to mediate attachment to a (metal) sulfide surface, (ii) to concentrate iron(III) ions by complexation through uronic acids or other residues at the mineral surface and, thus, allowing for an oxidative attack on the sulfide. Consequently, dissolution of the metal sulfide is enhanced, which may result in an acceleration of 20- to 100-fold over chemical leaching. Experiments were performed to elucidate the importance of the iron(III) ions complexed by extracellular polymeric substances for strain-specific differences in oxidative activity for pyrite. The preliminary data indicate that strains of Acidithiobacillus ferrooxidans, with a high amount of iron(III) ions in their extracellular polymeric substances, possess a higher oxidation activity than those with less iron(III) ions. These data provide new insight into the function of extracellular polymeric substances and the consequent advantage conferred to bacteria involved in bioleaching.

AB - Extracellular polymeric substances (EPS) seem to play a pivotal role in bioleaching - the winning of precious metals as well as acid rock drainage. For a better control of both processes structure and function of extracellular polymeric substances from leaching bacteria are of crucial importance. Our research focussed on Acidithibacillus ferrooxidans, the composition of its extracellular polymeric substances and further deduction of their function. The extracellular polymeric substances of Acidithiobacillus ferrooxidans consist mainly of neutral sugars and lipids. The functions of the extracellular polymeric substances of this leaching bacterium seem to be (i) to mediate attachment to a (metal) sulfide surface, (ii) to concentrate iron(III) ions by complexation through uronic acids or other residues at the mineral surface and, thus, allowing for an oxidative attack on the sulfide. Consequently, dissolution of the metal sulfide is enhanced, which may result in an acceleration of 20- to 100-fold over chemical leaching. Experiments were performed to elucidate the importance of the iron(III) ions complexed by extracellular polymeric substances for strain-specific differences in oxidative activity for pyrite. The preliminary data indicate that strains of Acidithiobacillus ferrooxidans, with a high amount of iron(III) ions in their extracellular polymeric substances, possess a higher oxidation activity than those with less iron(III) ions. These data provide new insight into the function of extracellular polymeric substances and the consequent advantage conferred to bacteria involved in bioleaching.

KW - Acidithiobacillus ferrooxidans

KW - Attachment

KW - Biofilm

KW - Bioleaching

KW - Extracellular polymeric substances (EPS)

KW - Iron(III) ions

KW - Pyrite

UR - http://www.scopus.com/inward/record.url?scp=0141903931&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0141903931&partnerID=8YFLogxK

U2 - 10.1016/S0304-386X(03)00176-2

DO - 10.1016/S0304-386X(03)00176-2

M3 - Article

AN - SCOPUS:0141903931

VL - 71

SP - 83

EP - 88

JO - Hydrometallurgy

JF - Hydrometallurgy

SN - 0304-386X

IS - 1-2

ER -