An experimental study on the remediation of phenanthrene in soil using ultrasound and soil washing |
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| Authors: | Weikun Song Jianbing Li Wen Zhang Xuan Hu and Ling Wang |
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| Institution: | (1) MOE Key Laboratory of Regional Energy Systems Optimization, Sino-Canada Research Academy of Energy and Environmental Studies, North China Electric Power University, Beijing, 102206, China;(2) Environmental Engineering Program, University of Northern British Columbia, Prince George, BC, V2N 4Z9, Canada;(3) College of Environmental Sciences and Engineering, Peking University, Beijing, 100871, China; |
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| Abstract: | A series of laboratory experiments were carried out in this study to investigate the remediation of phenanthrene contaminated
soil using ultrasound and soil washing. The results indicated that ultrasound and soil washing could significantly enhance
the remediation efficiency of each other. The performance of the combined ultrasonic and soil washing process was then investigated,
and the impacts of four experimental variables including the initial concentration of phenanthrene in soil, sonication time,
pH of washing solution, and washing flow rate were examined using an orthogonal experimental design method. The analysis of
variance (ANOVA) of experimental results revealed that the initial phenanthrene concentration, sonication time and soil washing
flow rate showed significant effects (P ≤ 0.05) on the remediation efficiency. A pseudo-first-order kinetics model was developed for describing the remediation process,
and a maximum remediation efficiency of 69.5% was observed in the study after 20 min of treatment under the experimental conditions.
Therefore, the results indicate that the combined ultrasonic and soil washing process could represent a promising technology
for the effective remediation of phenanthrene contaminated soil. |
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