A fluidized-bed reactor(FBR)was employed in the study to removelead from the synthetic wastewater by crystallization of metalcarbonate precipitates on surfaces of the sand grains. For theinfluent concentration up to 40 mg/L, lead removal efficiency reached99/100 and the effluent concentration was less than 1 mg/L when thesystem was operated with a series of optimum conditions. Feed radioC_T/［Pb~2+］and recycle ratio should by maintained at 3 mol/mol and0.67, respectively, and the hydraulic load should not be more than 22m/h. The optimum pH for lead carbonate crystallization was 8 to 9,while the ratio of bed height to total height of the FBR was 0.25 to0.3.
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