Abstract
To conduct a comprehensive ecological analysis on the solid residues derived from the thermal disposal of hyperaccumulator Pteris vittata, this study focused on the behaviors of As and Pb and the characteristics of environmentally persistent free radicals (EPFRs) in the solid residues under different thermal treatment conditions. The analysis results revealed that the concentrations of As in the biochars and bio-slag were approximately 350 and 1100 mg/kg, respectively. Moreover, the concentrations of Pb in the solid residues varied from 34 to 1050 mg/kg. According to the results of the modified BCR sequential extractions, As is more stable in the biochar while Pb is more stable in the combustion slags. In addition, As showed a higher volatilization temperature compared with Pb. The ecological risk assessment indicated that the correlation index between the contamination factor (Cf) of As and the risk index (R2 = 0.995) is considerably larger than the correlation index between the contamination factor of Pb and the risk index (R2 = 0.117), which implies that the pyrolysis method should be selected at priority. Moreover, the EPFR concentrations of the biochar declined by approximately 75 times when the pyrolysis temperature increased from 500 to 600 °C. This behavior indicated that high-temperature pyrolysis (> 600 °C) could simultaneously control both the heavy metal behavior and EPFR concentrations.
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This manuscript was edited by Wallace Academic Editing.
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This work was supported by The National Key Research and Development Program of China (2016YFD0801104), the Fundamental Research Funds for the Central Universities (No. 2016XZZX002-02, No. 2017FZA4013), and the National Natural Science Foundation of China (Grant No. 51621005).
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Sun, C., Ding, D., Chen, T. et al. Ecological risk analysis of the solid residues collected from the thermal disposal process of hyperaccumulator Pteris vittata including heavy metals and environmentally persistent free radicals. Environ Sci Pollut Res 26, 29234–29245 (2019). https://doi.org/10.1007/s11356-019-06115-9
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DOI: https://doi.org/10.1007/s11356-019-06115-9