首页|Effect of cyclodextrin on desorption of petroleum hydrocarbons in soil
Effect of cyclodextrin on desorption of petroleum hydrocarbons in soil
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NSTL
The present study delineated to explore the possibility of using cyclodextrins as an environmentally friendly solubilizer for enhancing the desorption efficiency of petroleum hydrocarbons (PHs) in the contaminated soil. The results showed that cyclodextrins could promote the transfer of PHs from the soil solid phase to the aqueous phase. Through the batch desorption experiments, single-factors influencing the desorption efficiency, including desorption time, species of cyclodextrin, solid to liquid ratio (S/L ratio) of soil to solvent, concentrations of solubilizer and concentrations of the contaminated soil were investigated. In addition, the response surface methodology analysis were used to identify the optimal desorption conditions, and the optimal desorption parameters were concluded as the follows: desorption time of 34 h, S/L ratio of soil to solvent of 1:25, concentration of p-CD of 0.75 g/L (for PAHs), desorption time of 18 h, S/L ratio of soil to solvent of 1:5, concentration of p-CD of 4.8 g/L (for n-alkanes). The highest desorption efficiency of two representative PHs, polycyclic aromatic hydrocarbons (PAHs, phenanthrene, fluoranthene and pyrene) and n-alkane (C16, C20, C24, C28 and C32), were 63.0% and 61.7%, respectively. This study presented new-positive evidence of cyclodextrins for enhancing desorption of PHs, was of great importance for enhancement of bioavailability of PHs, and further revealed the great potential of cyclodextrins as a solubilizer in-situ assisting removal of PHs in the petroleum-contaminated sites.
Key Laboratory of Industrial Ecology and Environmental Engineering (MOE), School of Environmental Science and Technology, Dalian University of Technology, 116024 Dalian, China
NSTL
