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Biosorption of Pb(II) Ions by Klebsiella sp. 3S1 Isolated from a Wastewater Treatment Plant: Kinetics and Mechanisms Studies

机译:克雷伯氏菌对Pb(II)离子的生物吸附。从废水处理厂分离出的3S1:动力学和机理研究

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摘要

Lead biosorption by Klebsiella sp. 3S1 isolated from a wastewater treatment plant was investigated through a Rotatable Central Composite Experimental Design. The optimisation study indicated the following optimal values of operating variables: 0.4 g/L of biosorbent dosage, pH 5, and 34°C. According to the results of the kinetic studies, the biosorption process can be described by a two-step process, one rapid, almost instantaneous, and one slower, both contributing significantly to the overall biosorption; the model that best fits the experimental results was pseudo-second order. The equilibrium studies showed a maximum lead uptake value of 140.19 mg/g according to the Langmuir model. The mechanism study revealed that lead ions were bioaccumulated into the cytoplasm and adsorbed on the cell surface. The bacterium  Klebsiella sp. 3S1 has a good potential in the bioremoval of lead in an inexpensive and effective process.
机译:克雷伯氏菌对铅的生物吸附。通过可旋转中央复合材料实验设计研究了从污水处理厂分离出的3S1。优化研究表明以下最佳操作变量值:0.4μg/ L的生物吸附剂量,pH 5和34°C。根据动力学研究的结果,生物吸附过程可以通过两步过程来描述,一个过程是快速的,几乎是瞬时的,而一个过程则是较慢的,这两个过程都对整个生物吸附起了重要作用。最适合实验结果的模型是伪二级。平衡研究表明,根据Langmuir模型,最大铅吸收值为140.19 mg / g。机理研究表明,铅离子被生物积累到细胞质中并吸附在细胞表面。细菌克雷伯氏菌3S1在廉价有效的工艺中具有生物去除铅的潜力。

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