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The remediation of Pb-contaminated port sediment by biosurfactant from a new isolated Bacillus sp. G1 was studied. The Pb removal efficiencies were investigated under multi-levels of water–solid ratio, pH and ionic strength. Result showed that exchangeable speciation of Pb could be removed by maximum removal capacity of 76.8 mg/g after leaching. The Langmuir isotherm reflected the adsorption process...