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Accumulation and fraction distribution of Ni(II) in activated sludge treating Ni-laden wastewater

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Abstract

The accumulation and fraction distribution of Ni(II) in sludge was determined, and their effect on the performance of sequencing batch reactor (SBR) systems was evaluated at laboratory scale. The results showed that the removal efficiencies of substrates decreased significantly with increasing feeding concentration of Ni(II) into SBRs. The concentration of Ni(II) fed into the SBRs was significantly positively correlated with the Ni(II) contents accumulated in the sludge, while it was negatively correlated with the biomass in the SBRs. The accumulated Ni(II) in the sludge was distributed mainly in the available fraction, accounting for 75.8–90.0 % of the total Ni(II) content. The accumulated content of Ni(II) in each sludge fraction could be predicted satisfactorily by the feeding Ni(II) concentrations in the solutions. As compared with the total contents and other chemical fractions, Ni(II) in the oxidizable fraction in sludge exhibited more important inhibition effects on sludge microorganisms in the SBRs.

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Acknowledgments

The present study was co-funded by the National Basic Research Program of China (No. 2008CB418203) and the China Postdoctoral Science Foundation (No. 20080431214).

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Correspondence to Xiaochen Li.

Additional information

Responsible editor: Angeles Blanco

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Jiang, R., Qi, J., Wang, W. et al. Accumulation and fraction distribution of Ni(II) in activated sludge treating Ni-laden wastewater. Environ Sci Pollut Res 21, 10744–10750 (2014). https://doi.org/10.1007/s11356-014-3035-0

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Keywords

  • Ni(II)
  • Accumulation
  • Chemical fraction
  • Bioavailability
  • Toxicity
  • Activated sludge
  • Sequencing batch reactor (SBR)