Resumo

CAICEDO PINEDA, Gerardo Andrés  e  MARQUEZ GODOY, Marco Antonio. Effect of cysteine in a biodesulfurization process of packed-bed coals. Rev. colomb. biotecnol [online]. 2016, vol.18, n.1, pp.112-120. ISSN 0123-3475.  https://doi.org/10.15446/rev.colomb.biote.v18n1.50471.

Biodesulphurization processes of a two sulphur-rich coals from Colombia ("Mina Vieja" y "Vampiro") were carried out at packed-bed reactors at erlenmeyer level, using a consortium of Acidithiobacillus ferrooxidans (ATCC 23270) and Acidithiobacillus thiooxidans (ATCC 15494). Cysteine addition were evaluated. The assays were monitored by measurements of iron content, pH, and redox potential. X-ray diffraction (XRD) were used to establish the mineralogy before and after the process. The assays without cysteine respectively reached a pyrite oxidation of 45.3% ("Mina Vieja") and 57.9% ("Vampiro") after 38 days. Cysteine addition improved pyrite oxidation by 14.9% ("Mina Vieja") and 6.4% ("Vampiro"). On the other hand, all the assays removed kaolinite by interaction with sulphuric acid of the media. In base to the results, coal compounds influence bacterial growth and affects the efficiency of cysteine over pyrite oxidation.

Palavras-chave : coal biodesulphurization; packed-bed reactor; cysteine; Acidithiobacillus ferrooxidans; Acidithiobacillus thiooxidans.

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