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Abstract：
A simultaneous denitrification and Cd (II) removal of strain CC1 was isolated from Li Jiahe oligotrophic reservoir of Xi\'an (China). Strain CC1 was identified as Cupriavidus sp. The first-order reaction kinetics equation was to model kinetic processes of mixotrophic anaerobic denitrification and Cd(II) removal, which showed an optimal NO3--N removal rate was obtained at the C/N ratio of 5.0, temperature of 30.0 °C and Fe(II) concentration of 15.0 mg L-1. A highest Cd(II) removal rate was achieved at the C/N ratio of 4.0, temperature of 30.0 °C and Fe(II) concentration of 15.0 mg L-1. Moreover, the role of extracellular polymeric substances (EPS) and biological precipitation on Cd(II) removal were investigated using a group of adsorption experiments. Additionally, XPS and XRD analysis demonstrated the possible mechanisms of biological precipitation for the removal of Cd(II). The experiment showed that strain CC1 had the ability to remove nitrate and Cd (II) simultaneously, which makes it possible to treat complex polluted water.
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