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

Abstract EN

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.