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Ferrous Iron Oxidation by the Immobilized Cells of Acidithiobacillus ferrooxidans
Gyeommin KIM,Myunghoon MOON,Tae Wan KIM 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
This study was aimed to develop the efficient bioprocess for ferrous iron oxidation by immobilized cells of Acidithiobacillus ferrooxidans. First, the medium was statistically optimized to minimize jarosite, a major ferric iron precipitate, based on response surface methodology (RSM). The results of RSM optimization predicted that the jarosite formation would be minimized in a medium at pH 1.8 which contains 2.75g/L of (NH4)2HPO4, 0.3g/L of MgSO4·7H2O, 0.15g/L of KCl, and 45g/L of FeSO4·7H2O. Then, based on the previous report that jarosite formed on the matrix surface helps the adhesion between the cells and the matrix, cell immobilization was performed by incubating flasks containing 9K medium, celite beads and A. ferrooxidans cells, which are favorable conditions for jarosite formation. After recovered, the immobilized cells were cultivated in the optimized medium in a repeated batch mode. It was observed that as the batch culture was repeated 5 times, the ferrous iron oxidation rate increased by 58% from 0.226 to 0.356 g/L/h, which is thought to be due to the increase in the concentration of immobilized cells. This study shows the potential to develop an efficient process for ferrous iron oxidation without loss of ferric iron.