Reduction of Np(V) and precipitation of Np(IV) by an anaerobic microbial consortium

Bruce Rittmann, James E. Banaszak, Donald T. Reed

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

A combination of experimental, analytical, and modeling investigations shows that an anaerobic, sulfate-reducing consortium reduced Np(V) to Np(IV), with subsequent precipitation of a Np(IV) solid. Precipitation of Np(IV) during growth on pyruvate occurred before sulfate reduction began. H2 stimulated precipitation of Np(IV) when added alone to growing cells, but it slowed precipitation when added along with pyruvate. Increasing concentrations of pyruvate also retarded precipitation. Accumulation of an intermediate pyruvate-fermentation product - probably succinate - played a key role in retarding Np(IV) precipitation by complexing the Np(IV). Hydrogen appears to have two roles in controlling Np precipitation: donating electrons for Np(V) reduction and modulating intermediate levels. That Np(V) is microbially reduced and subsequently precipitated under anaerobic conditions has likely beneficial implications for the containment of Np on lands contaminated by radionuclides, but complexation by fermentation intermediates can prevent immobilization by precipitation.

Original languageEnglish (US)
Pages (from-to)329-342
Number of pages14
JournalBiodegradation
Volume13
Issue number5
DOIs
StatePublished - 2002
Externally publishedYes

Fingerprint

Microbial Consortia
Pyruvic Acid
Fermentation
fermentation
sulfate
contaminated land
containment
Complexation
Radioisotopes
complexation
anoxic conditions
immobilization
Sulfates
radionuclide
hydrogen
electron
Hydrogen
Electrons
Succinic Acid
Immobilization

Keywords

  • Anaerobic consortium
  • Bioreduction
  • Complexation
  • Hydrogen
  • Modeling
  • Neptunium
  • Precipitation
  • Succinate

ASJC Scopus subject areas

  • Biotechnology

Cite this

Reduction of Np(V) and precipitation of Np(IV) by an anaerobic microbial consortium. / Rittmann, Bruce; Banaszak, James E.; Reed, Donald T.

In: Biodegradation, Vol. 13, No. 5, 2002, p. 329-342.

Research output: Contribution to journalArticle

Rittmann, Bruce ; Banaszak, James E. ; Reed, Donald T. / Reduction of Np(V) and precipitation of Np(IV) by an anaerobic microbial consortium. In: Biodegradation. 2002 ; Vol. 13, No. 5. pp. 329-342.
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