Abstract

CAICEDO-PINEDA, Gerardo Andrés  and  MARQUEZ-GODOY, Marco Antonio. Differences between the use of ferric sulphate and ferric chloride on biodesulfurization of a large coal particle. Dyna rev.fac.nac.minas [online]. 2016, vol.83, n.197, pp.74-80. ISSN 0012-7353.  https://doi.org/10.15446/dyna.v83n197.50318.

Three iron sources (FeSO₄, Fe₂(SO₄)₃ and FeCl₃) at different concentrations (150, 700 and 1250 mg Fe/L) were evaluated on large coal particle biodesulfurization processes at Erlenmeyer level. A consortium of Acidithiobacillus ferrooxidans (ATCC 23270) and Acidithiobacillus thiooxidans (ATCC 15494) was used in all the assays. By using 150 mg Fe²⁺/L (from FeSO₄), pyrite biooxidation was 31.14% after 12 days. When Fe₂(SO₄)₃ replaced FeSO₄, oxidation improved by 21.16%. The assays using the highest concentrations of sulphate sources also obtained the same increase. However, Fe₂(SO₄)₃ assays had a better sulphate removal from coal. This suggests that using the smallest concentration of Fe₂(SO₄)₃ is a good alternative to boost the pyrite oxidation rate and avoid the formation of precipitates. Additionally, biooxidation in the FeCl₃ assays decreased, indicating, a priori, that the microorganisms were not able to adapt properly to Cl^- ions.

Keywords : coal biodesulfurization; pyrite oxidation; ferric chloride; ferric sulphate; Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans.

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