AI Article Synopsis
- Strain CC1, a Cupriavidus species isolated from an oligotrophic reservoir in Xi'an, China, can simultaneously remove nitrate and cadmium (Cd II) from water.
- Optimal conditions for denitrification and Cd(II) removal were identified: a C/N ratio of 5.0 for nitrate, and 4.0 for Cd(II) at 30°C with 15 mg/L Fe(II).
- The study explored the role of extracellular polymeric substances (EPS) and biological precipitation in Cd(II) removal, supported by XPS and XRD analyses, indicating effectiveness in treating complex polluted water.
Article 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 NO-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. 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. 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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| http://dx.doi.org/10.1016/j.resmic.2019.05.001 | DOI Listing |
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