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

Wenyang Wang, Xiyuan Wang (), Hao Zhang, Qingdong Shi () and Huapeng Liu
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Wenyang Wang: College of Ecology and Environment, Xinjiang University, Urumqi 830046, China
Xiyuan Wang: College of Ecology and Environment, Xinjiang University, 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
Huapeng Liu: College of Ecology and Environment, Xinjiang University, Urumqi 830046, China

IJERPH, 2022, vol. 19, issue 18, 1-14

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.

Keywords: soil washing; persulfate; ZVI; rhamnolipid; pyrene (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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