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Characterizing the immiscible transport properties of diesel and water in peat soil.

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Title: Characterizing the immiscible transport properties of diesel and water in peat soil.
Authors: Gharedaghloo, Behrad1 behradg@aquanty.com, Price, Jonathan S.1 jsprice@uwaterloo.ca
Source: Journal of Contaminant Hydrology. Feb2019, Vol. 221, p11-25. 15p.
Subjects: Immiscibility, Peat soils, Peatlands, Hydrocarbons, Groundwater, Multiphase flow
Abstract: Abstract Extensive pipeline and railway corridors crossing Canadian peatlands make them vulnerable to hydrocarbon spills, potentially impairing ecosystem health, so it is important to be able to forecast hydrocarbon fate and transport within and beyond the peatland. The redistribution of hydrocarbon liquids in groundwater systems are controlled by the multiphase flow characteristics of the aquifer material including capillary pressure-saturation-relative permeability (P c -S-k r) relations. However, these relations have never been characterized for the hydrocarbon-water phases in peat. To address this, the flow and transport of diesel and water in peat soils were examined through a number of one dimensional vertical immiscible displacement tests, in which diesel was percolated into peat pore space displacing peat water, leading to a two-phase flow regime. Inverse modelling simulations using both Brooks and Corey's and power law relative permeability models, matched the data of the immiscible displacement tests well. Irreducible water saturation (S wirr) and the curvature of water relative permeability relation increased with peat bulk density. The residual diesel saturation (S Nr) ranged between 0.3% and 17% and increased with bulk density of peat. In a given peat, S Nr was a function of saturation history and increased with increasing maximum diesel saturation. The receding contact angles of water in water-air systems and diesel in diesel-air systems, respectively, were 51.7° and 61.2°, showing that the wetting tendency of peat in the air imbibition condition is toward the draining liquid. These experiments advance our knowledge on the behavior of hydrocarbons in peat, and can improve numerical modelling of hydrocarbon transport after a spill. Highlights • Water-NAPL relative permeability relations obtained for the first time in peat soil. • Water- & NAPL-air contact angle used to scale pressure-saturation relation in peat. • Peat bulk density increases residual NAPL/water saturation, decreases permeability. • Excavating ditches around the NAPL plume could effectively recover spilled NAPL. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Contaminant Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 135054116
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PubTypeId: academicJournal
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Items – Name: Title
  Label: Title
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  Data: Characterizing the immiscible transport properties of diesel and water in peat soil.
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  Data: <searchLink fieldCode="AR" term="%22Gharedaghloo%2C+Behrad%22">Gharedaghloo, Behrad</searchLink><relatesTo>1</relatesTo><i> behradg@aquanty.com</i><br /><searchLink fieldCode="AR" term="%22Price%2C+Jonathan+S%2E%22">Price, Jonathan S.</searchLink><relatesTo>1</relatesTo><i> jsprice@uwaterloo.ca</i>
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Contaminant+Hydrology%22">Journal of Contaminant Hydrology</searchLink>. Feb2019, Vol. 221, p11-25. 15p.
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  Data: <searchLink fieldCode="DE" term="%22Immiscibility%22">Immiscibility</searchLink><br /><searchLink fieldCode="DE" term="%22Peat+soils%22">Peat soils</searchLink><br /><searchLink fieldCode="DE" term="%22Peatlands%22">Peatlands</searchLink><br /><searchLink fieldCode="DE" term="%22Hydrocarbons%22">Hydrocarbons</searchLink><br /><searchLink fieldCode="DE" term="%22Groundwater%22">Groundwater</searchLink><br /><searchLink fieldCode="DE" term="%22Multiphase+flow%22">Multiphase flow</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Abstract Extensive pipeline and railway corridors crossing Canadian peatlands make them vulnerable to hydrocarbon spills, potentially impairing ecosystem health, so it is important to be able to forecast hydrocarbon fate and transport within and beyond the peatland. The redistribution of hydrocarbon liquids in groundwater systems are controlled by the multiphase flow characteristics of the aquifer material including capillary pressure-saturation-relative permeability (P c -S-k r) relations. However, these relations have never been characterized for the hydrocarbon-water phases in peat. To address this, the flow and transport of diesel and water in peat soils were examined through a number of one dimensional vertical immiscible displacement tests, in which diesel was percolated into peat pore space displacing peat water, leading to a two-phase flow regime. Inverse modelling simulations using both Brooks and Corey's and power law relative permeability models, matched the data of the immiscible displacement tests well. Irreducible water saturation (S wirr) and the curvature of water relative permeability relation increased with peat bulk density. The residual diesel saturation (S Nr) ranged between 0.3% and 17% and increased with bulk density of peat. In a given peat, S Nr was a function of saturation history and increased with increasing maximum diesel saturation. The receding contact angles of water in water-air systems and diesel in diesel-air systems, respectively, were 51.7° and 61.2°, showing that the wetting tendency of peat in the air imbibition condition is toward the draining liquid. These experiments advance our knowledge on the behavior of hydrocarbons in peat, and can improve numerical modelling of hydrocarbon transport after a spill. Highlights • Water-NAPL relative permeability relations obtained for the first time in peat soil. • Water- & NAPL-air contact angle used to scale pressure-saturation relation in peat. • Peat bulk density increases residual NAPL/water saturation, decreases permeability. • Excavating ditches around the NAPL plume could effectively recover spilled NAPL. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Contaminant Hydrology is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.jconhyd.2018.12.005
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 15
        StartPage: 11
    Subjects:
      – SubjectFull: Immiscibility
        Type: general
      – SubjectFull: Peat soils
        Type: general
      – SubjectFull: Peatlands
        Type: general
      – SubjectFull: Hydrocarbons
        Type: general
      – SubjectFull: Groundwater
        Type: general
      – SubjectFull: Multiphase flow
        Type: general
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      – TitleFull: Characterizing the immiscible transport properties of diesel and water in peat soil.
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            NameFull: Gharedaghloo, Behrad
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            NameFull: Price, Jonathan S.
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            – D: 01
              M: 02
              Text: Feb2019
              Type: published
              Y: 2019
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              Value: 221
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