Effect of different carbon dioxide concentrations on ferrous iron and pyrite oxidation by a mixed culture of iron and/or sulfur-oxidizing bacteria (original) (raw)

Enzyme and microbial technology, 1993

Abstract

Abstract In batch systems, the effect of CO 2 on the kinetics of three bacterial populations (P1, P2, and P3) involved in bioleaching was studied on synthetic and pyritic medium. The behavior of these three populations was not identical in the presence of different concentrations of CO 2 . At 0.03% in CO 2 , P1 and P2 were the first populations to start growth in the reactor. They grew rapidly at first but immediately after showed a rapid decline, regardless of the medium; at 2 and 4% CO 2 , we could observe a decrease in the initial number of the P1 and P2 cells throughout the experiments. When the biomass concentration of the P1 and P2 populations became negligible in the medium, it was always the turn of the P3 population to grow. The results show that P3 was the dominant population in all the experiments and was mainly responsible for ferrous iron and pyrite oxidation. However, its growth was dependent upon the CO 2 concentration in the medium. At 2% CO 2 , the P3 population showed a maximal biomass concentration higher than that obtained for 0.03 and 4% in CO 2 in the two media.

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