Multiple-pathway remediation of mercury contamination by a versatile selenite-reducing bacterium

Xiaonan Wang, Zhanfei He, Hongwei Luo, Ming Zhang, Daoyong Zhang, Xiangliang Pan (Lead / Corresponding author), Geoffrey Michael Gadd

Research output: Contribution to journalArticle

5 Citations (Scopus)
65 Downloads (Pure)

Abstract

Mercury contamination is a global concern because of its high toxicity, persistence, bioaccumulative nature, long distance transport and wide distribution in the environment. In this study, the efficiency and multiple-pathway remediation mechanisms of Hg(2+) by a selenite reducing Escherichia coli was assessed. E. coli can reduce Hg(2+) to Hg(+) and Hg(0) and selenite to selenide at the same time. This makes a multiple-pathway mechanisms for removal of Hg(2+) from water in addition to biosorption. It was found that when the original Hg(2+) concentration was 40μgL(-1), 93.2±2.8% of Hg(2+) was removed from solution by E. coli. Of the total Hg removed, it was found that 3.3±0.1% was adsorbed to the bacterium, 2.0±0.5% was bioaccumulated, and 7.3±0.6% was volatilized into the ambient environment, and most (80.6±5.7%) Hg was removed as HgSe and HgCl precipitates and Hg(0). On one hand, selenite is reduced to selenide and the latter further reacts with Hg(2+) to form HgSe precipitates. On the other hand Hg(2+) is successively reduced to Hg(+), which forms solid HgCl, and Hg(0). This is the report on bacterially transformation of Hg(2+) to HgSe, HgCl and Hg(0) via multiple pathways. It is suggested that E. coli or other selenite reducing microorganisms are promising candidates for mercury bioremediation of contaminated wastewaters, as well as simultaneous removal of Hg(2+) and selenite.

Original languageEnglish
Pages (from-to)615-623
Number of pages9
JournalScience of the Total Environment
Volume615
Early online date5 Oct 2017
DOIs
Publication statusPublished - 15 Feb 2018

Fingerprint

Selenious Acid
selenite
Remediation
Mercury
Escherichia coli
Bacteria
remediation
Contamination
bacterium
Precipitates
Biosorption
Bioremediation
Microorganisms
Toxicity
Wastewater
bioremediation
persistence
microorganism
mercury contamination
toxicity

Keywords

  • Biodegradation, Environmental
  • Escherichia coli/metabolism
  • Mercury/metabolism
  • Selenious Acid/metabolism
  • Water Pollutants, Chemical/metabolism

Cite this

Wang, Xiaonan ; He, Zhanfei ; Luo, Hongwei ; Zhang, Ming ; Zhang, Daoyong ; Pan, Xiangliang ; Gadd, Geoffrey Michael. / Multiple-pathway remediation of mercury contamination by a versatile selenite-reducing bacterium. In: Science of the Total Environment. 2018 ; Vol. 615. pp. 615-623.
@article{f4f828aa6947487c90ba2a3b7e1343ad,
title = "Multiple-pathway remediation of mercury contamination by a versatile selenite-reducing bacterium",
abstract = "Mercury contamination is a global concern because of its high toxicity, persistence, bioaccumulative nature, long distance transport and wide distribution in the environment. In this study, the efficiency and multiple-pathway remediation mechanisms of Hg(2+) by a selenite reducing Escherichia coli was assessed. E. coli can reduce Hg(2+) to Hg(+) and Hg(0) and selenite to selenide at the same time. This makes a multiple-pathway mechanisms for removal of Hg(2+) from water in addition to biosorption. It was found that when the original Hg(2+) concentration was 40μgL(-1), 93.2±2.8{\%} of Hg(2+) was removed from solution by E. coli. Of the total Hg removed, it was found that 3.3±0.1{\%} was adsorbed to the bacterium, 2.0±0.5{\%} was bioaccumulated, and 7.3±0.6{\%} was volatilized into the ambient environment, and most (80.6±5.7{\%}) Hg was removed as HgSe and HgCl precipitates and Hg(0). On one hand, selenite is reduced to selenide and the latter further reacts with Hg(2+) to form HgSe precipitates. On the other hand Hg(2+) is successively reduced to Hg(+), which forms solid HgCl, and Hg(0). This is the report on bacterially transformation of Hg(2+) to HgSe, HgCl and Hg(0) via multiple pathways. It is suggested that E. coli or other selenite reducing microorganisms are promising candidates for mercury bioremediation of contaminated wastewaters, as well as simultaneous removal of Hg(2+) and selenite.",
keywords = "Biodegradation, Environmental, Escherichia coli/metabolism, Mercury/metabolism, Selenious Acid/metabolism, Water Pollutants, Chemical/metabolism",
author = "Xiaonan Wang and Zhanfei He and Hongwei Luo and Ming Zhang and Daoyong Zhang and Xiangliang Pan and Gadd, {Geoffrey Michael}",
note = "This work was supported by the National Natural Science Foundation of China (U1503281 and U1403181). G. M. Gadd also gratefully acknowledges an award (NE/M01090/1) under the National Environmental Research Council (UK) Security of Supply of Mineral Resources Grant Program: Tellurium and Selenium Cycling and Supply (TeASe).",
year = "2018",
month = "2",
day = "15",
doi = "10.1016/j.scitotenv.2017.09.336",
language = "English",
volume = "615",
pages = "615--623",
journal = "Science of the Total Environment",
issn = "0048-9697",
publisher = "Elsevier",

}

Multiple-pathway remediation of mercury contamination by a versatile selenite-reducing bacterium. / Wang, Xiaonan; He, Zhanfei; Luo, Hongwei; Zhang, Ming; Zhang, Daoyong; Pan, Xiangliang (Lead / Corresponding author); Gadd, Geoffrey Michael.

In: Science of the Total Environment, Vol. 615, 15.02.2018, p. 615-623.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Multiple-pathway remediation of mercury contamination by a versatile selenite-reducing bacterium

AU - Wang, Xiaonan

AU - He, Zhanfei

AU - Luo, Hongwei

AU - Zhang, Ming

AU - Zhang, Daoyong

AU - Pan, Xiangliang

AU - Gadd, Geoffrey Michael

N1 - This work was supported by the National Natural Science Foundation of China (U1503281 and U1403181). G. M. Gadd also gratefully acknowledges an award (NE/M01090/1) under the National Environmental Research Council (UK) Security of Supply of Mineral Resources Grant Program: Tellurium and Selenium Cycling and Supply (TeASe).

PY - 2018/2/15

Y1 - 2018/2/15

N2 - Mercury contamination is a global concern because of its high toxicity, persistence, bioaccumulative nature, long distance transport and wide distribution in the environment. In this study, the efficiency and multiple-pathway remediation mechanisms of Hg(2+) by a selenite reducing Escherichia coli was assessed. E. coli can reduce Hg(2+) to Hg(+) and Hg(0) and selenite to selenide at the same time. This makes a multiple-pathway mechanisms for removal of Hg(2+) from water in addition to biosorption. It was found that when the original Hg(2+) concentration was 40μgL(-1), 93.2±2.8% of Hg(2+) was removed from solution by E. coli. Of the total Hg removed, it was found that 3.3±0.1% was adsorbed to the bacterium, 2.0±0.5% was bioaccumulated, and 7.3±0.6% was volatilized into the ambient environment, and most (80.6±5.7%) Hg was removed as HgSe and HgCl precipitates and Hg(0). On one hand, selenite is reduced to selenide and the latter further reacts with Hg(2+) to form HgSe precipitates. On the other hand Hg(2+) is successively reduced to Hg(+), which forms solid HgCl, and Hg(0). This is the report on bacterially transformation of Hg(2+) to HgSe, HgCl and Hg(0) via multiple pathways. It is suggested that E. coli or other selenite reducing microorganisms are promising candidates for mercury bioremediation of contaminated wastewaters, as well as simultaneous removal of Hg(2+) and selenite.

AB - Mercury contamination is a global concern because of its high toxicity, persistence, bioaccumulative nature, long distance transport and wide distribution in the environment. In this study, the efficiency and multiple-pathway remediation mechanisms of Hg(2+) by a selenite reducing Escherichia coli was assessed. E. coli can reduce Hg(2+) to Hg(+) and Hg(0) and selenite to selenide at the same time. This makes a multiple-pathway mechanisms for removal of Hg(2+) from water in addition to biosorption. It was found that when the original Hg(2+) concentration was 40μgL(-1), 93.2±2.8% of Hg(2+) was removed from solution by E. coli. Of the total Hg removed, it was found that 3.3±0.1% was adsorbed to the bacterium, 2.0±0.5% was bioaccumulated, and 7.3±0.6% was volatilized into the ambient environment, and most (80.6±5.7%) Hg was removed as HgSe and HgCl precipitates and Hg(0). On one hand, selenite is reduced to selenide and the latter further reacts with Hg(2+) to form HgSe precipitates. On the other hand Hg(2+) is successively reduced to Hg(+), which forms solid HgCl, and Hg(0). This is the report on bacterially transformation of Hg(2+) to HgSe, HgCl and Hg(0) via multiple pathways. It is suggested that E. coli or other selenite reducing microorganisms are promising candidates for mercury bioremediation of contaminated wastewaters, as well as simultaneous removal of Hg(2+) and selenite.

KW - Biodegradation, Environmental

KW - Escherichia coli/metabolism

KW - Mercury/metabolism

KW - Selenious Acid/metabolism

KW - Water Pollutants, Chemical/metabolism

U2 - 10.1016/j.scitotenv.2017.09.336

DO - 10.1016/j.scitotenv.2017.09.336

M3 - Article

VL - 615

SP - 615

EP - 623

JO - Science of the Total Environment

JF - Science of the Total Environment

SN - 0048-9697

ER -