Replacing Synthetic with Microbial Surfactants as Collectors in the Treatment of Aqueous Effluent Produced by Acid Mine Drainage,Using the Dissolved Air Flotation Technique |
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Authors: | Carlyle T B Menezes Erilson C Barros Raquel D Rufino Juliana M Luna Leonie A Sarubbo |
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Institution: | 1.Institute of Environmental Technology Research,University of Southernmost Catarinense,Criciúma,Brazil;2.Nucleus of Research in Environmental Sciences (NPCIAMB),Catholic University of Pernambuco,Boa Vista,Brazil;3.Center for Sciences and Technology,Catholic University of Pernambuco,Boa Vista,Brazil |
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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. |
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