TY - JOUR
T1 - High-rate iron oxidation at below pH 1 and at elevated iron and copper concentrations by a Leptospirillum ferriphilum dominated biofilm
AU - Kinnunen, Päivi H.M.
AU - Puhakka, Jaakko A.
PY - 2005/11/1
Y1 - 2005/11/1
N2 - 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+.
AB - 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+.
KW - Ferrous iron oxidation
KW - Leptospirillum ferriphilum
KW - Metal tolerance
UR - http://www.scopus.com/inward/record.url?scp=24944443324&partnerID=8YFLogxK
U2 - 10.1016/j.procbio.2005.03.050
DO - 10.1016/j.procbio.2005.03.050
M3 - Article
AN - SCOPUS:24944443324
SN - 1359-5113
VL - 40
SP - 3536
EP - 3541
JO - Process Biochemistry
JF - Process Biochemistry
IS - 11
ER -