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Simultaneous removal of Cd2+, NO3-N and hardness by the bacterium Acinetobacter sp. CN86 in aerobic conditions

Abstract

This study investigated the factors influencing the simultaneous removal of Cd2+, NO3-N and hardness from water by the bacterial strain CN86. Optimum conditions were determined experimentally by varying the type of organic matter used, initial Cd2+ concentration, and pH. Under the optimum conditions, the maximum removal ratios of Cd2+, NO3-N and hardness were 100.00, 89.85 and 71.63%, respectively. The mechanism of Cd2+ removal is a combination of co-precipitation with calcium carbonate and pH. Further confirmation that Cd2+ can be removed by strain CN86 was provided by XRD and XPS analyses. Meteorological chromatography analysis showed that N2 was produced as an end product. These results demonstrate that the bacterial strain CN86 is a suitable candidate for simultaneously removing Cd2+, NO3-N, and hardness during in wastewater treatment.

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Acknowledgements

This research work was partly supported by the National Natural Science Foundation of China (NSFC) (Nos. 51678471, 51778523). Key Scientific Technological Innovation Team Plan of Shaanxi Province (No. 2017KCT-19-02). Key research and development plan of Shaanxi Province (2018ZDXM-SF-029).

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Correspondence to Jun feng Su.

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Su, J.f., Gao, Y.c., Huang, T.l. et al. Simultaneous removal of Cd2+, NO3-N and hardness by the bacterium Acinetobacter sp. CN86 in aerobic conditions. Bioprocess Biosyst Eng 42, 1333–1342 (2019). https://doi.org/10.1007/s00449-019-02132-7

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Keywords

  • Cd2+ removal mechanism
  • Aerobic denitrification
  • Hardness
  • pH
  • MICP