Experimental Study of the Factors Influencing Heptane Volatilization from Sands
In the remediation design of organic contaminated sites with soil vapor extraction method or thermal desorption method, one of the key problems is the volatilization of organic compounds from soil. In this research, the heptane was selected as the organic contaminants. Through a series of laboratory experiments, the volatilization process of heptane from unsaturated sands were studied under controlled conditions. The heptane-contaminated sand samples with different water content and organic content were prepared, and the kinetic process of volatilization was simulated in the laboratory. A thermostatic water bath was adopted to control the temperature of sand samples in the experiments. The results indicate that the removal process of heptane from soil by volatilization can be divided into two stages. It evaporates quickly in the first stage and then the removal rate becomes slower and slower. The volatilization rate of heptane is higher under high concentration than that under low concentration in the same period of time. In addition, the temperature has a great impact on heptane removal efficiency. Increasing temperature can improve the volatilization rate of heptane from soil samples.
KeywordsInfluencing factors Volatilization Heptane Soil vapour extraction
This work was supported by the National Natural Science Foundation of China (Project No. 41672280, 41330641).
- Mei ZH, Zhao S (2015) Discussion on application of ex - situ soil vapor extraction in some organic contaminated sites. Pollut Control Technol 28(1):16–18 (in Chinese)Google Scholar
- Wang HL, Wang F, Zhang XP, Wang WF (2015) Field study on influencing factors in removal of volatile organic compounds by soil vapor extraction. Sci Technol Eng 15(10):238–246 (in Chinese)Google Scholar
- Wang Y (2010) Numerical simulation of the remediation of a coking plant by soil vapor extraction. Geotech Investig Surv s1:796–801 (in Chinese)Google Scholar
- Xiang XB (2015) Engineering application in remediation of petroleum contaminated site by soil vapor extraction. Doctoral dissertation, Beijing University of Chemical Technology, Beijing (in Chinese)Google Scholar
- Yang YW, Zhang XB, Guo LL, Li SP An application case of ex-situ soil vapor extraction in a subway remediation project in Beijing. Environmental Engineering, (5) 170–172 (2016). (in Chinese)Google Scholar