Selenium oxyanion inhibition of hydrogenotrophic and acetoclastic methanogenesis

M. Lenz, N. Janzen, P.N.L. Lens

Research output: Contribution to journalArticleAcademicpeer-review

18 Citations (Scopus)

Abstract

Inhibitory effects of selenite and selenate towards hydrogenotrophic and acetoclastic methanogenesis were evaluated in anaerobic toxicity assays. The 50% inhibitory concentration (IC50) of both selenium oxyanions was below 6.1 X 10(-5) M in hydrogenotrophic assays, whereas acetoclastic methanogens were less inhibited: IC50 = 8.3 x 10(-5) M and 5.5 x 10(-4) M for selenite and selenate, respectively. Selenite completely inhibits methanogenesis from both substrates tested at concentrations >= 10(-3) M selenite, while only marginal methanogenic activities occur at equimolar concentrations of selenate. Selenite becomes irreversibly inhibitory upon a single exposure, whereas selenate inhibits methanogens upon repeated exposure. Consequently, methane recovery can be seriously hampered or even impossible during anaerobic treatment of highly selenium contaminated waste streams.
Original languageEnglish
Pages (from-to)383-388
JournalChemosphere
Volume73
Issue number3
DOIs
Publication statusPublished - 2008

Fingerprint

Methanogens
Selenious Acid
selenite
Selenic Acid
methanogenesis
Selenium
selenate
selenium
Assays
Inhibitory Concentration 50
Toxicity
Methane
Recovery
assay
Substrates
methane
toxicity
substrate

Keywords

  • anaerobic granular sludge
  • agricultural drainage sediment
  • escherichia-coli
  • thauera-selenatis
  • waste-water
  • elemental selenium
  • sulfate reduction
  • bed reactors
  • bioremediation
  • removal

Cite this

Lenz, M. ; Janzen, N. ; Lens, P.N.L. / Selenium oxyanion inhibition of hydrogenotrophic and acetoclastic methanogenesis. In: Chemosphere. 2008 ; Vol. 73, No. 3. pp. 383-388.
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Selenium oxyanion inhibition of hydrogenotrophic and acetoclastic methanogenesis. / Lenz, M.; Janzen, N.; Lens, P.N.L.

In: Chemosphere, Vol. 73, No. 3, 2008, p. 383-388.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Selenium oxyanion inhibition of hydrogenotrophic and acetoclastic methanogenesis

AU - Lenz, M.

AU - Janzen, N.

AU - Lens, P.N.L.

N1 - ISI:000260040600020

PY - 2008

Y1 - 2008

N2 - Inhibitory effects of selenite and selenate towards hydrogenotrophic and acetoclastic methanogenesis were evaluated in anaerobic toxicity assays. The 50% inhibitory concentration (IC50) of both selenium oxyanions was below 6.1 X 10(-5) M in hydrogenotrophic assays, whereas acetoclastic methanogens were less inhibited: IC50 = 8.3 x 10(-5) M and 5.5 x 10(-4) M for selenite and selenate, respectively. Selenite completely inhibits methanogenesis from both substrates tested at concentrations >= 10(-3) M selenite, while only marginal methanogenic activities occur at equimolar concentrations of selenate. Selenite becomes irreversibly inhibitory upon a single exposure, whereas selenate inhibits methanogens upon repeated exposure. Consequently, methane recovery can be seriously hampered or even impossible during anaerobic treatment of highly selenium contaminated waste streams.

AB - Inhibitory effects of selenite and selenate towards hydrogenotrophic and acetoclastic methanogenesis were evaluated in anaerobic toxicity assays. The 50% inhibitory concentration (IC50) of both selenium oxyanions was below 6.1 X 10(-5) M in hydrogenotrophic assays, whereas acetoclastic methanogens were less inhibited: IC50 = 8.3 x 10(-5) M and 5.5 x 10(-4) M for selenite and selenate, respectively. Selenite completely inhibits methanogenesis from both substrates tested at concentrations >= 10(-3) M selenite, while only marginal methanogenic activities occur at equimolar concentrations of selenate. Selenite becomes irreversibly inhibitory upon a single exposure, whereas selenate inhibits methanogens upon repeated exposure. Consequently, methane recovery can be seriously hampered or even impossible during anaerobic treatment of highly selenium contaminated waste streams.

KW - anaerobic granular sludge

KW - agricultural drainage sediment

KW - escherichia-coli

KW - thauera-selenatis

KW - waste-water

KW - elemental selenium

KW - sulfate reduction

KW - bed reactors

KW - bioremediation

KW - removal

U2 - 10.1016/j.chemosphere.2008.05.059

DO - 10.1016/j.chemosphere.2008.05.059

M3 - Article

VL - 73

SP - 383

EP - 388

JO - Chemosphere

JF - Chemosphere

SN - 0045-6535

IS - 3

ER -