Immobilized cells of Acidithiobacillus ferrooxidans in PVC strands and sultite removal in a pilot-scale bioreactor


Autoria(s): Giro, MEA; Garcia, O.; Zaiat, M.
Contribuinte(s)

Universidade Estadual Paulista (UNESP)

Data(s)

20/05/2014

20/05/2014

15/02/2006

Resumo

The biooxidation of ferrous ion into ferric ion by Acidithiobacillus ferrooxidans can be potentially used for the removal of H2S from industrial gases. In this work, Fe3+ ions were obtained through the oxidation of Fe2+ using the LR strain of At. ferrooxidans immobilized in PVC stands in a pilot-scale bioreactor, while H2S was removed in an absorption tower equipped with Rasching rings. At. ferrooxidans LR strain cells were immobilized by inoculating the bacterium in a Fe2+-mineral medium and percolating it through the support. After complete Fe2+ oxidation, which took around 90 h, the reactor was washed several times with sulfuric acid (pH 1.7) before a new cycle was started. Four additional cycles using fresh Fe2+ mineral medium were then run. During these colonization cycles, the time required for complete iron oxidation decreased, dropping to about 60 h in the last cycle. The batch experiments in the H2S gas removal trials resulted in a gas removal rate of about 98-99% under the operational conditions employed. In the continuous experiments with the bioreactor coupled to the gas absorption column, a gas removal efficiency of almost 100% was reached after 500 min. Precipitate containing mainly sulfur formed during the experimental trial was identified by EDX. (c) 2005 Elsevier B.V. All rights reserved.

Formato

201-207

Identificador

http://dx.doi.org/10.1016/j.bej.2005.11.005

Biochemical Engineering Journal. Lausanne: Elsevier B.V. Sa, v. 28, n. 2, p. 201-207, 2006.

1369-703X

http://hdl.handle.net/11449/37347

10.1016/j.bej.2005.11.005

WOS:000235682700013

Idioma(s)

eng

Publicador

Elsevier B.V.

Relação

Biochemical Engineering Journal

Direitos

closedAccess

Palavras-Chave #biological oxidation #bioreactors #Acidithiobacillus-ferooxidans #ferrous sulfate #immobilization #hydrogen sulfide
Tipo

info:eu-repo/semantics/article