Experiments of the aeration treatment of uranium-contained wastewater by saccharomyces cere- visiae-activated sludge were carried out. The experimental results indicate that

saccharomyces cerevisiae (S.C) can accumulate UO22+ effectively from aqueous solution: the removal ratio of 100 mg?L-1 UO22+ is 78.2% when S.C dos- age is 10 g?L-1

while with 8 g?L-1 activated sludge (A.S.) added in the solution the ratio has increased to 96.3%; then

5―10 min effluent settling is clarified as a result of sludge flocculation; the optimum conditions of biosorption of U from wastewater by S.C.-A.S. are at pH 5

A.S concentration=8 g?L-1

added dry weight of S.C. =10 g?L-1

granularity of S.C=100―120mesh; the quantity of U increases with the enhanced initial concentration of UO22+ in the process of biosorption by S.C.-A.S.

but the removal ratio deceases. The uptake of U could be described by the Freundlich and the Langmuir adsorption isotherms

which demonstrated that the adsorption was regarded as a physical adsorption.