Biosorption of copper by yeast, Loddermyces elongisporus, isolated from industrial effluents: its potential use in wastewater treatment

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Abstract

The present study is aimed at assessing the ability of metal resistant yeast, Loddermyces elongisporus, to uptake metal from liquid medium. The minimum inhibitory concentration of Cu2+ against Loddermyces elongisporus ranged between 2.2–2.3 mg/l. The yeast could also tolerate Zn2+ (2.9 mg/l), Hg2+ (2.4 mg/l), Ni2+ (2.2 mg/l), Cr6+ (2.0 mg/l), Pb2+ (1.1 mg/l), and Cd2+ (0.8 mg/l). The yeast isolate showed typical growth curves but lag and log phases extended in the presence of copper. Yeast isolate showed optimum growth at 30 ºC and pH 8. Metal processing ability of the isolate was determined in a medium containing 0.1 mg/l of Cu2+. Loddermyces elongisporus could reduce Cu2+ 15%, 26%, 39%, 50%, 60%, 67%, 75% and 81% from the medium after 6, 12, 18, 24, 30, 48, 72 and 96 hours, respectively. L. elongisporus could also efficiently remove 80% copper from the medium after 96 h and was able to remove Cu2+ 60% and 77% from the wastewater after 4 and 8 d, respectively. The metal binding ability suggests possibility of using this yeast strain for removal of copper from metal contaminated wastewater. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

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