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Applied Biochemistry and Biotechnology

, Volume 163, Issue 4, pp 540–546 | Cite as

Replacing Synthetic with Microbial Surfactants as Collectors in the Treatment of Aqueous Effluent Produced by Acid Mine Drainage, Using the Dissolved Air Flotation Technique

  • Carlyle T. B. Menezes
  • Erilson C. Barros
  • Raquel D. Rufino
  • Juliana M. Luna
  • Leonie A. SarubboEmail author
Article

Abstract

Dissolved air flotation (DAF) is a well-established separation process employing micro bubbles as a carrier phase. The application of this technique in the treatment of acid mine drainage, using three yeast biosurfactants as alternative collectors, is hereby analyzed. Batch studies were carried out in a 50-cm high acrylic column with an external diameter of 2.5 cm. High percentages (above 94%) of heavy metals Fe(III) and Mn(II) were removed by the biosurfactants isolated from Candida lipolytica and Candida sphaerica and the values were found to be similar to those obtained with the use of the synthetic sodium oleate surfactant. The DAF operation with both surfactant and biosurfactants, achieved acceptable turbidity values, in accordance with Brazilian standard limits. The best ones were obtained by the biosurfactant from C. lipolytica, which reached 4.8 NTU. The results obtained with a laboratory synthetic effluent were also satisfactory. The biosurfactants removed almost the same percentages of iron, while the removal percentages of manganese were slightly higher compared with those obtained in the acid mine drainage effluent. They showed that the use of low-cost biosurfactants as collectors in the DAF process is a promising technology for the mining industries.

Keywords

Biosurfactants Flotation Effluent treatment Heavy metals Candida Low-cost substrate 

Notes

Acknowledgments

This work was financially supported by Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq). We are grateful to Instituto de pesquisas Ambientais e Tecnológicas (IPAT), from Universidade do Extremo Sul Catarinense, Brazil and to Núcleo de Pesquisas em Ciências Ambientais (NPCIAMB) laboratories, from Universidade Católica de Pernambuco, Brazil.

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Copyright information

© Springer Science+Business Media, LLC 2010

Authors and Affiliations

  • Carlyle T. B. Menezes
    • 1
  • Erilson C. Barros
    • 1
  • Raquel D. Rufino
    • 2
  • Juliana M. Luna
    • 2
  • Leonie A. Sarubbo
    • 2
    • 3
    Email author
  1. 1.Institute of Environmental Technology ResearchUniversity of Southernmost CatarinenseCriciúmaBrazil
  2. 2.Nucleus of Research in Environmental Sciences (NPCIAMB)Catholic University of PernambucoBoa VistaBrazil
  3. 3.Center for Sciences and TechnologyCatholic University of PernambucoBoa VistaBrazil

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