Ferrous Iron Oxidation in Packed-Bed Reactors at Elevated Temperatures

Abstract:

The ferrous iron oxidation by mixed culture of moderately thermophilic microorganisms (Sulfobacillus thermosulfidooxidans Sh 10-1 and Acidiplasma MBA-1) was investigated in continuous experiments in three packed-bed reactors connected in series at temperature 55°C, and a pH of 1.0. Two solutions were used in the experiments. The first one contained (g L^-1) 59 Fe²⁺, the second one contained (g L^-1) 59 Fe²⁺, 16 Fe³⁺, 2 Cu²⁺, 2 Zn²⁺. The hydraulic retention time was 120 hours. Iron oxidation rates in the experiment with the first solution were 0.5, 0.35, and 0.2 g L^-1 h^-1 in first, second and third reactor, respectively. The oxidation rates in the experiment with the second solution were 0.3, 0.2, and 0.185 g L^-1 h^-1 in first, second and third reactor, respectively. Iron oxidation efficiencies in the experiments with the first and second solutions were 77% and 47%. Stable continuous iron oxidation at high temperature was successfully demonstrated, but further investigations are required for improving the rate and efficiencies of oxidation.

• Periodical: Advanced Materials Research (Volume 1130)
• Pages: 226-229
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1130.226
• Online since: November 2015
• Authors: Aleksandr Bulaev*
• Keywords: Acidiplasma, Iron Oxidation, Leaching, Sulfobacillus

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