Temperature effects on the iron oxidation kinetics of a Leptospirillum ferriphilum dominated culture at pH below one

Özkaya B., Nurmi P., Sahinkaya E., Kaksonen A. H., Puhakka J. A.

17th International Biohydrometallurgy Symposium, IBS 2007, Frankfurt am Main, Almanya, 2 - 05 Eylül 2007, cilt.20-21, ss.465-468, (Tam Metin Bildiri) identifier

  • Yayın Türü: Bildiri / Tam Metin Bildiri
  • Cilt numarası: 20-21
  • Doi Numarası: 10.4028/0-87849-452-9.465
  • Basıldığı Şehir: Frankfurt am Main
  • Basıldığı Ülke: Almanya
  • Sayfa Sayıları: ss.465-468
  • Anahtar Kelimeler: Arrhenius, Oxidation kinetics, Ratkowsky, Temperature dependency
  • Marmara Üniversitesi Adresli: Hayır

Özet

In this study, ferrous iron oxidation rates of a Leptospirillum ferriphilum dominated culture were determined over the temperature range of 2-50°C at pH below one. The results show that at pH 0.9 the culture oxidizes iron within the temperature range of 10°C to 45°C. Using the Arrhenius equation, an Ea value of 89.9 ± 6.75 kJ/mol was calculated. From the data fitted to Ratkowsky Equation, the optimum, minimum and maximum temperatures were 35 ± 1.5, 9.96 ± 1.72 and 42.93 ± 0.64 °C for this culture, respectively. The redox potential of the solution becomes more positive, which was the maximum (650-700 mV) at temperatures between 19-40 °C due to completing biological oxidation and increasing in ferric iron concentration. © 2007 Trans Tech Publications.