High-rate iron oxidation at below pH 1 and at elevated iron and copper concentrations by a Leptospirillum ferriphilum dominated biofilm

Päivi H.M. Kinnunen, Jaakko A. Puhakka

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)

Abstract

The influences of H+, Fe2+, Fe3+ and Cu2+ ion concentrations and their different combinations on the iron oxidation by an enrichment culture dominated by Leptospirillum ferriphilum were studied in batch experiments and continuous-flow fluidized-bed reactors. The iron oxidation rate did not significantly vary in the pH range of 0.9-1.5 and was only partially inhibited at pH 0.7. Ferric and ferrous iron at 5 and 24 g L-1, respectively, had little or no effect on iron oxidation by the enrichment culture and the iron oxidation rate slightly decreased at higher concentrations. At a loading rate of 3 g Fe2+ L-1 h -1, 2 g L-1 Cu2+ did not affect the iron oxidation rate, whereas at a loading rate of 10 g Fe2+ L-1 h-1 it reduced the rate by 69%. The maximum iron oxidation rate was 10 g Fe2+ L-1 h-1 at pH 0.9 and in the presence of 21 g L-1 Fe2+ and 2 g L-1 Cu2+.

Original languageEnglish
Pages (from-to)3536-3541
Number of pages6
JournalProcess Biochemistry
Volume40
Issue number11
DOIs
Publication statusPublished - 1 Nov 2005
MoE publication typeNot Eligible

Keywords

  • Ferrous iron oxidation
  • Leptospirillum ferriphilum
  • Metal tolerance

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