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Effects of bubble-facilitated VOC transport from LNAPL smear zones on vapor intrusion.

紀錄類型:	書目-語言資料,手稿 : Monograph/item
正題名/作者:	Effects of bubble-facilitated VOC transport from LNAPL smear zones on vapor intrusion./
作者:	Soucy, Nicole Christine.
面頁冊數:	1 online resource (136 pages)
附註:	Source: Masters Abstracts International, Volume: 78-10.
Contained By:	Masters Abstracts International78-10.
標題:	Civil engineering. -
電子資源:	click for full text (PQDT)
ISBN:	9798209773153

Effects of bubble-facilitated VOC transport from LNAPL smear zones on vapor intrusion.
Soucy, Nicole Christine.

Effects of bubble-facilitated VOC transport from LNAPL smear zones on vapor intrusion. - 1 online resource (136 pages)

Source: Masters Abstracts International, Volume: 78-10.

Thesis (M.A.Sc.)--Queen's University (Canada), 2016.

Includes bibliographical references

Light non-aqueous phase liquid (LNAPL) sources can pose a significant threat to indoor air through vapour intrusion (VI). Most conceptual and numerical models of VI assume that the transport of volatile organic compounds (VOCs) is a diffusion-limited process. Recently, alternate conditions have been identified that could lead to faster transport, including the presence of preferential pathways and methanogenic gas production. In this study, an additional mechanism that could lead to faster transport was investigated: bubble-facilitated VOC transport from LNAPL smear zones. A laboratory investigation was preformed using pentane in one-dimensional laboratory columns and two-dimensional visualization experiments. Results of the column experiments showed that average VOC mass fluxes in the bubble-facilitated columns were over two orders of magnitude greater than in the diffusion-limited columns. In addition, the flux signal was intermittent, consistent with expectations of bubble-facilitated transport as bubbles expand, mobilize and are released to the vadose zone at various times during the test. The results from the visualization experiments showed gas fingers growing and mobilizing over time, which supports the findings of the column experiments. In conclusion, these results demonstrate the potential for bubble-facilitated VOC transport to affect mass transfer in LNAPL smear zones, and lead to increased indoor air concentrations by VI.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2024

Mode of access: World Wide Web

ISBN: 9798209773153Subjects--Topical Terms:

561339
Civil engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Effects of bubble-facilitated VOC transport from LNAPL smear zones on vapor intrusion.
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500 $a Source: Masters Abstracts International, Volume: 78-10.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Mumford, Kevin.
502 $a Thesis (M.A.Sc.)--Queen's University (Canada), 2016.
504 $a Includes bibliographical references
520 $a Light non-aqueous phase liquid (LNAPL) sources can pose a significant threat to indoor air through vapour intrusion (VI). Most conceptual and numerical models of VI assume that the transport of volatile organic compounds (VOCs) is a diffusion-limited process. Recently, alternate conditions have been identified that could lead to faster transport, including the presence of preferential pathways and methanogenic gas production. In this study, an additional mechanism that could lead to faster transport was investigated: bubble-facilitated VOC transport from LNAPL smear zones. A laboratory investigation was preformed using pentane in one-dimensional laboratory columns and two-dimensional visualization experiments. Results of the column experiments showed that average VOC mass fluxes in the bubble-facilitated columns were over two orders of magnitude greater than in the diffusion-limited columns. In addition, the flux signal was intermittent, consistent with expectations of bubble-facilitated transport as bubbles expand, mobilize and are released to the vadose zone at various times during the test. The results from the visualization experiments showed gas fingers growing and mobilizing over time, which supports the findings of the column experiments. In conclusion, these results demonstrate the potential for bubble-facilitated VOC transport to affect mass transfer in LNAPL smear zones, and lead to increased indoor air concentrations by VI.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2024
538 $a Mode of access: World Wide Web
650 4 $a Civil engineering. $3 561339
655 7 $a Electronic books. $2 local $3 554714
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773 0 $t Masters Abstracts International $g 78-10.
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