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Rhamnolipid-Enhanced ZVI-Activated Sodium Persulfate Remediation of Pyrene-Contaminated Soil

Author

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  • Wenyang Wang

    (College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
    Xinjiang Key Laboratory of Oasis Ecology, Urumqi 830046, China)

  • Xiyuan Wang

    (College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
    Xinjiang Key Laboratory of Oasis Ecology, Urumqi 830046, China)

  • Hao Zhang

    (Department of Construction and Environmental Chemical Engineering, Yanshan University Liren College, Qinhuangdao 066004, China)

  • Qingdong Shi

    (College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
    Xinjiang Key Laboratory of Oasis Ecology, Urumqi 830046, China)

  • Huapeng Liu

    (College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
    Xinjiang Key Laboratory of Oasis Ecology, Urumqi 830046, China)

Abstract

In soil, polycyclic aromatic hydrocarbons (PAHs) are tightly bound to organic components, but surfactants can effectively transform them from a solid to a liquid phase. In this study, the biosurfactant rhamnolipid (RL) was selected as the eluent; shaking elution in a thermostatic oscillator improved the elution rate of pyrene, and the effects of RL concentration, temperature, and elution time on the elution effect were compared. After four repeated washings, the maximum elution rate was 75.6% at a rhamnolipid concentration of 20 g/L and a temperature of 45 °C. We found that 38 μm Zero-Valent Iron (ZVI) had a higher primary reaction rate (0.042 h −1 ), with a degradation rate of 94.5% when 3 g/L ZVI was added to 21 mM Na 2 S 2 O 8 at 60 °C. Finally, electron paramagnetic resonance (EPR) detected DMPO-OH and DMPO-SO 4 signals, which played a major role in the degradation of pyrene. Overall, these results show that the combination of rhamnolipid elution and persulfate oxidation system effectively remediated pyrene-contaminated soil and provides some implications for the combined remediation with biosurfactants and chemical oxidation.

Suggested Citation

  • Wenyang Wang & Xiyuan Wang & Hao Zhang & Qingdong Shi & Huapeng Liu, 2022. "Rhamnolipid-Enhanced ZVI-Activated Sodium Persulfate Remediation of Pyrene-Contaminated Soil," IJERPH, MDPI, vol. 19(18), pages 1-14, September.
    • Handle: RePEc:gam:jijerp:v:19:y:2022:i:18:p:11518-:d:913586
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    References listed on IDEAS

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    1. Meiling Han & Jin Zhang & Wen Chu & Gongfu Zhou & Jiahao Chen, 2020. "Surface-Modified Sewage Sludge-Derived Carbonaceous Catalyst as a Persulfate Activator for Phenol Degradation," IJERPH, MDPI, vol. 17(9), pages 1-14, May.
    2. Yanhua Qiu & Meilan Xu & Zongquan Sun & Helian Li, 2019. "Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process," IJERPH, MDPI, vol. 16(3), pages 1-10, February.
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