Volatilization behavior of diesel oil-water-glass bead system exposed to freeze-thaw cycles

Volatilization behavior of diesel oil-water-glass bead system exposed to freeze-thaw cycles

Volatilization plays an important role in the attenuation and redistribution of petroleum products in contaminated porous media. However, the volatilization behavior of petroleum products exposed to freeze-thaw cycles is not well understood. In this study, we investigated the volatilization behavior...

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Veröffentlicht in:Water research (Oxford) 2023-10, Vol.244, p.120433-120433, Article 120433
Hauptverfasser: Chen, Yongqiang, Dou, Zhi, Zhou, Zhifang, Wang, Jinguo
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Dou, Zhi
Zhou, Zhifang
Wang, Jinguo
description Volatilization plays an important role in the attenuation and redistribution of petroleum products in contaminated porous media. However, the volatilization behavior of petroleum products exposed to freeze-thaw cycles is not well understood. In this study, we investigated the volatilization behavior of diesel oil-water-glass bead systems under different freeze-thaw cycles. Low-field nuclear magnetic resonance (LF-NMR) was used to quantitatively and spatially monitor the mass loss of the diesel oil-water-glass bead system during volatilization. The mechanism of the influence of freeze-thaw cycles on volatilization in the diesel oil-water-glass bead system was analyzed. The results show that the freeze-thaw cycles have a significant effect on the volatilization rate of diesel oil and water. As the number of freeze-thaw cycles increases, the volatilization rate of diesel oil shows an overall downward trend while the volatilization rate of water shows an overall upward trend. The volatilization loss of the liquids (both diesel oil and water) is mainly due to the volatilization loss of water, indicating that water is more volatile than diesel oil in the diesel oil-water system. The spatial distribution of the diesel oil signal monitored by LF-NMR showed that diesel oil volatilizes mainly in the upper layer of the sample, associating with the preferential volatilization loss in the large pores. The lumped parameter λ related to the characteristic volatilization length L was introduced to characterize the volatilization rate of diesel oil and water with the increase of volatilization time. For a diesel oil-water-glass bead system exposed to freeze-thaw cycles, the 1/ L of diesel oil decreases exponentially and rapidly with increasing volatilization time, while the 1/ L of water decreases almost linearly and slowly with increasing volatilization time. This different dependence of 1/ L on volatilization time leads to the individual volatilization behavior of diesel oil and water.
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However, the volatilization behavior of petroleum products exposed to freeze-thaw cycles is not well understood. In this study, we investigated the volatilization behavior of diesel oil-water-glass bead systems under different freeze-thaw cycles. Low-field nuclear magnetic resonance (LF-NMR) was used to quantitatively and spatially monitor the mass loss of the diesel oil-water-glass bead system during volatilization. The mechanism of the influence of freeze-thaw cycles on volatilization in the diesel oil-water-glass bead system was analyzed. The results show that the freeze-thaw cycles have a significant effect on the volatilization rate of diesel oil and water. As the number of freeze-thaw cycles increases, the volatilization rate of diesel oil shows an overall downward trend while the volatilization rate of water shows an overall upward trend. The volatilization loss of the liquids (both diesel oil and water) is mainly due to the volatilization loss of water, indicating that water is more volatile than diesel oil in the diesel oil-water system. The spatial distribution of the diesel oil signal monitored by LF-NMR showed that diesel oil volatilizes mainly in the upper layer of the sample, associating with the preferential volatilization loss in the large pores. The lumped parameter λ related to the characteristic volatilization length L was introduced to characterize the volatilization rate of diesel oil and water with the increase of volatilization time. For a diesel oil-water-glass bead system exposed to freeze-thaw cycles, the 1/ L of diesel oil decreases exponentially and rapidly with increasing volatilization time, while the 1/ L of water decreases almost linearly and slowly with increasing volatilization time. 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However, the volatilization behavior of petroleum products exposed to freeze-thaw cycles is not well understood. In this study, we investigated the volatilization behavior of diesel oil-water-glass bead systems under different freeze-thaw cycles. Low-field nuclear magnetic resonance (LF-NMR) was used to quantitatively and spatially monitor the mass loss of the diesel oil-water-glass bead system during volatilization. The mechanism of the influence of freeze-thaw cycles on volatilization in the diesel oil-water-glass bead system was analyzed. The results show that the freeze-thaw cycles have a significant effect on the volatilization rate of diesel oil and water. As the number of freeze-thaw cycles increases, the volatilization rate of diesel oil shows an overall downward trend while the volatilization rate of water shows an overall upward trend. The volatilization loss of the liquids (both diesel oil and water) is mainly due to the volatilization loss of water, indicating that water is more volatile than diesel oil in the diesel oil-water system. The spatial distribution of the diesel oil signal monitored by LF-NMR showed that diesel oil volatilizes mainly in the upper layer of the sample, associating with the preferential volatilization loss in the large pores. The lumped parameter λ related to the characteristic volatilization length L was introduced to characterize the volatilization rate of diesel oil and water with the increase of volatilization time. For a diesel oil-water-glass bead system exposed to freeze-thaw cycles, the 1/ L of diesel oil decreases exponentially and rapidly with increasing volatilization time, while the 1/ L of water decreases almost linearly and slowly with increasing volatilization time. 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However, the volatilization behavior of petroleum products exposed to freeze-thaw cycles is not well understood. In this study, we investigated the volatilization behavior of diesel oil-water-glass bead systems under different freeze-thaw cycles. Low-field nuclear magnetic resonance (LF-NMR) was used to quantitatively and spatially monitor the mass loss of the diesel oil-water-glass bead system during volatilization. The mechanism of the influence of freeze-thaw cycles on volatilization in the diesel oil-water-glass bead system was analyzed. The results show that the freeze-thaw cycles have a significant effect on the volatilization rate of diesel oil and water. As the number of freeze-thaw cycles increases, the volatilization rate of diesel oil shows an overall downward trend while the volatilization rate of water shows an overall upward trend. The volatilization loss of the liquids (both diesel oil and water) is mainly due to the volatilization loss of water, indicating that water is more volatile than diesel oil in the diesel oil-water system. The spatial distribution of the diesel oil signal monitored by LF-NMR showed that diesel oil volatilizes mainly in the upper layer of the sample, associating with the preferential volatilization loss in the large pores. The lumped parameter λ related to the characteristic volatilization length L was introduced to characterize the volatilization rate of diesel oil and water with the increase of volatilization time. For a diesel oil-water-glass bead system exposed to freeze-thaw cycles, the 1/ L of diesel oil decreases exponentially and rapidly with increasing volatilization time, while the 1/ L of water decreases almost linearly and slowly with increasing volatilization time. This different dependence of 1/ L on volatilization time leads to the individual volatilization behavior of diesel oil and water.</abstract><cop>England</cop><pmid>37572461</pmid><doi>10.1016/j.watres.2023.120433</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0002-5155-0710</orcidid></addata></record>
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title Volatilization behavior of diesel oil-water-glass bead system exposed to freeze-thaw cycles
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