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Bioengineering and Bioscience(CEASE PUBLICATION) Vol. 1(3), pp. 31 - 36
DOI: 10.13189/bb.2013.010302
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Bioleaching as Possible Method of Sorbent Regeneration

Zuzana Dankov谩 ^1,*, Iveta 艩tyriakov谩 ¹, Annam谩ria Mockov膷iakov谩 ¹, Igor 艩tyriak ¹, M谩ria Orol铆nov谩 ^2
1 Institute of Geotechnics, Slovak Academy of Sciences, Watsonova 45, 040 01 Ko拧ice, Slovak Republic
² Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Ko拧ice, Slovak Republic

ABSTRACT

The possibility to use the heterotrophic bacteria of Bacillus sp. for regeneration of natural montmorillonite and montmorillonite/iron oxide composite after the Cu(II) adsorption was studied and compared with the classical methods of chemical regeneration. After 10 days of bioleaching the bacteria released approximately 80 % of loaded Cu(II), leaving the sorbents stable. Longer treatment and higher concentration of dissolved metal cations in the solution caused the reverse sorption of Cu(II) by bacteria. The treating of composite with adsorbed Cu(II) with organic acids (oxalic, citric) led to partial Cu(II) dissolution. The hydrochloric acid caused its structural destruction, liberated the Fe ions from the oxides precipitated on the bentonite surface. The bioregenerated sorbent was successfully repeatedly used for the Cu(II) adsorption.

KEYWORDS
Montmorillonite, Composite, Chemical Regeneration, Bacteria, Bioregeneration

Cite This Paper in IEEE or APA Citation Styles
(a). IEEE Format:
[1] Zuzana Dankov谩 , Iveta 艩tyriakov谩 , Annam谩ria Mockov膷iakov谩 , Igor 艩tyriak , M谩ria Orol铆nov谩 , "Bioleaching as Possible Method of Sorbent Regeneration," Bioengineering and Bioscience(CEASE PUBLICATION), Vol. 1, No. 3, pp. 31 - 36, 2013. DOI: 10.13189/bb.2013.010302.

(b). APA Format:
Zuzana Dankov谩 , Iveta 艩tyriakov谩 , Annam谩ria Mockov膷iakov谩 , Igor 艩tyriak , M谩ria Orol铆nov谩 (2013). Bioleaching as Possible Method of Sorbent Regeneration. Bioengineering and Bioscience(CEASE PUBLICATION), 1(3), 31 - 36. DOI: 10.13189/bb.2013.010302.