Abstract With the adsorption rate and biomass as indicators and on the basis of single factors, the opti-
mal conditions of Chlorella vulgaris adsorbing Cd 2+ were determined using the response surface method,
with the result that various factors on the adsorption of Cd 2+ were significantly affected and the order of
influence of the concentration being cadmium>solution pH>culture temperature. Using the regression
equation to predict the optimal conditions for the adsorption of Cd 2+ , the biomass and chlorella adsorption
rate reached 0.71 g/L and 85.2% when the temperature, pH and the concentration of the culture fluid were
maintained at 29.14 ℃ , 6.67 and 30.74 μmol/L, respectively.