Abstract
In this study, while Rhizopus delemar removes Zn(II) ions in the wastewater with the help of bioaccumulation mechanisms, the effects of increasing concentrations of Zn(II) ions both on micro-organism growth and lipase enzyme production which biodegrades lipids were investigated. The parameters which affect micro-organism growth, lipid biosynthesis, and Zn(II) bioaccumulation were determined as pH, temperature, and initial Zn(II) ion concentration. In single factor experiments, pH and temperature were studied in the ranges of 5.0–8.0 and 25–35°C, respectively, while initial Zn(II) ion concentration was changed between 5 and 200 mg/L. At pH 5.0, and temperature 35°C, maximum Zn(II) removal was obtained as 26.31 mg/L in the bioaccumulation medium containing 30 mg/L Zn(II) initially. The lipase activities and micro-organism concentrations obtained in Zn(II)-free and the preceding media were 656 and 537 U/L, 1.16 and 0.82 g/L, respectively. When the biomass concentration was kept constant at a required level, in order to maximize the bioaccumulation of Zn(II) and lipase biosynthesis, a statistical experimental design was applied. Maximum Zn(II) bioaccumulation was obtained as 32.38 mg/L at pH 6.8, 33.8°C and 41 mg/L initial Zn(II) concentration. At this optimum point, it was determined that lipase activity is 586 U/L and micro-organism concentration is 0.62 g/L.
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