[en] The objective of this work is to evaluate the utility of a mixed culture of denitrifying bacteria for the separation of uranium from process wastewaters. The selection of this culture was based upon the knowledge that wastewaters generated in a number of nuclear-materials processing operations require treatment to remove both nitrate and uranium. The effects of process variables on the rate of uranium accumulation and equilibrium distribution were studied. Several methods for contacting the biosorbent with aqueous uranium solutions were examined. These included suspended cells or flocs in stirred-tank reactors and films of cells or inert particles in columnar reactors. Results indicating the equilibrium distribution of uranium between the biosorbent and liquid phases are presented as a sorption isotherm. Saturation of the biosorbent with uranium was attained at a biosorbent-phase uranium concentration of about 0.14g uranium/g dry cells. 11 refs