Abstract
Petroleum hydrocarbons released to the environment caused by leakage or illegal dumping pose a threat to human health and the natural environment. In this study, the potential of a pulsed corona discharge plasma system for treating petroleum-polluted soils was evaluated. This system removed 76.93 % of the petroleum from the soil in 60 min with an energy efficiency of 0.20 mg/kJ. Furthermore, the energy and degradation efficiencies for the remediation of soil contaminated by single polyaromatic hydrocarbons, such as phenanthrene and pyrene, were also compared, and the results showed that this technology had potential in organic-polluted soil remediation. In addition, the role of water molecules was investigated for their direct involvement in the formation and transportation of active species. The increase of soil moisture to a certain extent clearly benefitted degradation efficiency. Then, treated soils were analyzed by FTIR and GC-MS for proposing the degradation mechanism of petroleum. During the plasma discharging processes, the change of functional group and the detection of small aromatic hydrocarbons indicated that the plasma active species attached petroleum hydrocarbons and degradation occurred. This technique reported herein demonstrated significant potential for the remediation of heavily petroleum-polluted soil, as well as for the treatment of organic-polluted soils.
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Abbreviations
- PAHs:
-
Polycyclic aromatic hydrocarbons
- AOPs:
-
Advanced oxidation processes
- PCD:
-
Pulsed corona discharge
- PHE:
-
Phenanthrene
- SI:
-
Supporting information
- DC:
-
Direct current
- EE:
-
Energy efficiency
- HPLC:
-
High-performance liquid chromatography
- TOC:
-
Total organic carbon
- GC-MS:
-
Gas chromatography-mass spectrometry
- FTIR:
-
Fourier transform infrared spectroscopy
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Acknowledgments
This work was completed by the financial support of the National Natural Science Foundation of China (No. 51578122), the program for New Century Excellent Talents in University (NCET-12-0826), Shanghai Pujiang Program, the Fundamental Research funds for Central Universities (CUSF-DH-D-2015041), and China Scholarship Council. All the financial supports are gratefully acknowledged.
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Li, R., Liu, Y., Mu, R. et al. Evaluation of pulsed corona discharge plasma for the treatment of petroleum-contaminated soil. Environ Sci Pollut Res 24, 1450–1458 (2017). https://doi.org/10.1007/s11356-016-7929-x
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DOI: https://doi.org/10.1007/s11356-016-7929-x