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versão impressa ISSN 0012-7353


CAICEDO-PINEDA, Gerardo Andrés  e  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.

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.

Palavras-chave : coal biodesulfurization; pyrite oxidation; ferric chloride; ferric sulphate; Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans.

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