Experimental Study of the Factors Influencing Heptane Volatilization from Sands

Wei, Qibing; Liu, Zhibin; Liu, Songyu; Wang, Yi; Mao, Boyang; Liu, Feng

doi:10.1007/978-981-13-2221-1_48

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“…It depends not only on the soil conditions (e.g., water content and characteristic of soil) but also on the environmental conditions (e.g., wind speed, air relative humidity and temperature) and VOCs properties (Li et al 2004, Okamoto et al 2009, Tao et al 2017). In recent years, Wei (Wei et al 2018) and Chao (Chao et al 2018) studied the importance of temperature and wind speed on volatilization process from soil. The higher the temperature and wind speed are, the greater the volatilization rate will be.…”

Section: Introductionmentioning

confidence: 99%

Volatilization process of toluene from contaminated soil under consideration of co-existence of pore water

Liu

et al. 2021

Environ Sci Pollut Res

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The volatilization process of contaminants has been shown to play an important role in remediation of VOCs-contaminated soils. The aim of this paper is to study the volatilization characteristics of both toluene and water from soil, and to evaluate their interaction mechanism under different conditions. A test system is developed to measure mass loss of contaminants and water from soil by volatilization. It was found that basically the volatilization process could be divided into two stages in clay and one stage in sand. Two main in uential mechanisms of water on the volatilization of toluene include molecules competitive adsorption and blocking of volatilization channels. In addition, the evaporation process of water was restricted by volatilization of toluene. Volatilization rate of toluene would increase with the increase of water content when the water content was low. But it would decrease with the increase of water content when the water content was higher than 15% in clay. In addition, there existed an optimal water content (15%) under which the maxium volatilization rate could be achieved.

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