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 140.19mg/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.