Abstract
In this paper, transformation of chemical forms of heavy metals (Cu, Zn, Ni, Pb, Cr, Cd, Mn, and Mg) in sewage sludge (SS) during ozonation was investigated. Meanwhile, the risk of heavy metals to environment in ozonated sludge (OS) and SS was estimated according to risk assessment code (RAC). The residual rates of heavy metals were over 72.8 %, which demonstrated that the heavy metals in SS were mainly existed in the OS after ozonation. The results indicated that the ozonation had an effect on the redistribution of heavy metals. The comparisons of the RAC between OS and SS indicated that the environmental risk of heavy metals in OS was aggravated compared to SS, except for Mg. Consequently, it was suggested that the OS should be pretreated before application.
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Acknowledgments
This study was supported by the Major Science and Technology Program for Water Pollution Control and Management (No. 2013ZX07201007, 2014ZX07201012), the State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (No. 2014DX03), and the Science Fund for Distinguished Young Scholars of Heilongjiang Province (JC201303). The authors also appreciate the Open Project of State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology (QA201609-02), and the Heilongjiang Postdoctoral Science Foundation (LBH-Z14093).
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Zhang, J., Tian, Y., Zhang, J. et al. Distribution and risk assessment of heavy metals in sewage sludge after ozonation. Environ Sci Pollut Res 24, 5118–5125 (2017). https://doi.org/10.1007/s11356-016-6313-1
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DOI: https://doi.org/10.1007/s11356-016-6313-1