Toxicity of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in anaerobic sludge

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Abstract

Heavy metals could potentially negatively impact microorganisms in anaerobic sulfate reducing bioreactors. The objective of this is study was to evaluate the inhibitory effect of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in sludge obtained from a full-scale sulfate reducing bioreactor. The 50% inhibiting concentration (50%IC) of Cu2+ to acetoclastic and hydrogenotrophic methanogens was 20.7 and 8.9 mg l-1, respectively. The 50%IC of Cu2+ to acetoclastic sulfate reduction was 32.3 mg l-1. The hydrogenotrophic sulfate reducers were only inhibited by 27% at the highest concentration of Cu2+ tested, 200 mg l-1, indicating a high level of tolerance. The soluble Cu2+ was observed to decrease rapidly in both the methanogenic and sulfate reducing assays. The highest level of decrease was observed in the hydrogenotrophic sulfate reducing assay which was over 99% in 5 h. The results of this study indicate that sulfate reducing biotechnologies would be robust at relatively high inlet concentrations of Cu2+.

Original languageEnglish (US)
Pages (from-to)121-127
Number of pages7
JournalChemosphere
Volume62
Issue number1
DOIs
StatePublished - Jan 2006

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Methanogens
Sewage
Sulfates
Toxicity
Copper
sludge
sulfate
copper
toxicity
Bioreactors
bioreactor
Assays
assay
biotechnology
Biotechnology
Heavy Metals
Microorganisms
Heavy metals
tolerance
microorganism

Keywords

  • Heavy metals
  • Inhibition
  • Methanogenesis
  • Sulfate reduction

ASJC Scopus subject areas

  • Environmental Chemistry
  • Environmental Science(all)

Cite this

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title = "Toxicity of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in anaerobic sludge",
abstract = "Heavy metals could potentially negatively impact microorganisms in anaerobic sulfate reducing bioreactors. The objective of this is study was to evaluate the inhibitory effect of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in sludge obtained from a full-scale sulfate reducing bioreactor. The 50{\%} inhibiting concentration (50{\%}IC) of Cu2+ to acetoclastic and hydrogenotrophic methanogens was 20.7 and 8.9 mg l-1, respectively. The 50{\%}IC of Cu2+ to acetoclastic sulfate reduction was 32.3 mg l-1. The hydrogenotrophic sulfate reducers were only inhibited by 27{\%} at the highest concentration of Cu2+ tested, 200 mg l-1, indicating a high level of tolerance. The soluble Cu2+ was observed to decrease rapidly in both the methanogenic and sulfate reducing assays. The highest level of decrease was observed in the hydrogenotrophic sulfate reducing assay which was over 99{\%} in 5 h. The results of this study indicate that sulfate reducing biotechnologies would be robust at relatively high inlet concentrations of Cu2+.",
keywords = "Heavy metals, Inhibition, Methanogenesis, Sulfate reduction",
author = "Srilakshmi Karri and {Sierra Alvarez}, {Maria Reye} and Field, {James A}",
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language = "English (US)",
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AU - Karri, Srilakshmi

AU - Sierra Alvarez, Maria Reye

AU - Field, James A

PY - 2006/1

Y1 - 2006/1

N2 - Heavy metals could potentially negatively impact microorganisms in anaerobic sulfate reducing bioreactors. The objective of this is study was to evaluate the inhibitory effect of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in sludge obtained from a full-scale sulfate reducing bioreactor. The 50% inhibiting concentration (50%IC) of Cu2+ to acetoclastic and hydrogenotrophic methanogens was 20.7 and 8.9 mg l-1, respectively. The 50%IC of Cu2+ to acetoclastic sulfate reduction was 32.3 mg l-1. The hydrogenotrophic sulfate reducers were only inhibited by 27% at the highest concentration of Cu2+ tested, 200 mg l-1, indicating a high level of tolerance. The soluble Cu2+ was observed to decrease rapidly in both the methanogenic and sulfate reducing assays. The highest level of decrease was observed in the hydrogenotrophic sulfate reducing assay which was over 99% in 5 h. The results of this study indicate that sulfate reducing biotechnologies would be robust at relatively high inlet concentrations of Cu2+.

AB - Heavy metals could potentially negatively impact microorganisms in anaerobic sulfate reducing bioreactors. The objective of this is study was to evaluate the inhibitory effect of copper to acetoclastic and hydrogenotrophic activities of methanogens and sulfate reducers in sludge obtained from a full-scale sulfate reducing bioreactor. The 50% inhibiting concentration (50%IC) of Cu2+ to acetoclastic and hydrogenotrophic methanogens was 20.7 and 8.9 mg l-1, respectively. The 50%IC of Cu2+ to acetoclastic sulfate reduction was 32.3 mg l-1. The hydrogenotrophic sulfate reducers were only inhibited by 27% at the highest concentration of Cu2+ tested, 200 mg l-1, indicating a high level of tolerance. The soluble Cu2+ was observed to decrease rapidly in both the methanogenic and sulfate reducing assays. The highest level of decrease was observed in the hydrogenotrophic sulfate reducing assay which was over 99% in 5 h. The results of this study indicate that sulfate reducing biotechnologies would be robust at relatively high inlet concentrations of Cu2+.

KW - Heavy metals

KW - Inhibition

KW - Methanogenesis

KW - Sulfate reduction

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