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Temporal and spatial pore water pressure distribution surrounding a vertical landfill leachate recirculation well.

Kadambala R, Townsend TG, Jain P, Singh K - Int J Environ Res Public Health (2011)

Bottom Line: While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported.After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time.The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Engineering Sciences, University of Florida, PO BOX 116450, Gainesville, FL 32611, USA. kadambalar@cdm.com

ABSTRACT
Addition of liquids into landfilled waste can result in an increase in pore water pressure, and this in turn may increase concerns with respect to geotechnical stability of the landfilled waste mass. While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported. Pressure readings from vibrating wire piezometers placed in the waste surrounding a liquids addition well at a full-scale operating landfill in Florida were recorded over a 2-year period. Prior to the addition of liquids, measured pore pressures were found to increase with landfill depth, an indication of gas pressure increase and decreasing waste permeability with depth. When liquid addition commenced, piezometers located closer to either the leachate injection well or the landfill surface responded more rapidly to leachate addition relative to those far from the well and those at deeper locations. After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time. Despite the large pressures present at the bottom of the liquid addition well, much smaller pressures were measured in the surrounding waste. The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.

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Pore pressures measured by the piezometers at various depths inside the landfill prior to leachate recirculation.
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f3-ijerph-08-01692: Pore pressures measured by the piezometers at various depths inside the landfill prior to leachate recirculation.

Mentions: Figure 3 presents the box-and-whisker plot of the pore pressures measured by the piezometers at various depths in the landfill before leachate recirculation. The line inside the box represents the median. The right and left sides of the box represent the 75th percentile and the 25th percentile, respectively. The lines that extend right and left (whiskers) from the box represent the 90th and 10th percentiles, respectively. The outliers are presented individually outside the whiskers as individual data points. The pore pressures varied from 0.5 m to 5 m of w.c. The initial high pore pressures in the waste are believed to be a result of landfill gas pressure produced from the decomposition of organic waste. The pressure increased substantially with depth.


Temporal and spatial pore water pressure distribution surrounding a vertical landfill leachate recirculation well.

Kadambala R, Townsend TG, Jain P, Singh K - Int J Environ Res Public Health (2011)

Pore pressures measured by the piezometers at various depths inside the landfill prior to leachate recirculation.
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC3108135&req=5

f3-ijerph-08-01692: Pore pressures measured by the piezometers at various depths inside the landfill prior to leachate recirculation.
Mentions: Figure 3 presents the box-and-whisker plot of the pore pressures measured by the piezometers at various depths in the landfill before leachate recirculation. The line inside the box represents the median. The right and left sides of the box represent the 75th percentile and the 25th percentile, respectively. The lines that extend right and left (whiskers) from the box represent the 90th and 10th percentiles, respectively. The outliers are presented individually outside the whiskers as individual data points. The pore pressures varied from 0.5 m to 5 m of w.c. The initial high pore pressures in the waste are believed to be a result of landfill gas pressure produced from the decomposition of organic waste. The pressure increased substantially with depth.

Bottom Line: While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported.After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time.The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.

View Article: PubMed Central - PubMed

Affiliation: Department of Environmental Engineering Sciences, University of Florida, PO BOX 116450, Gainesville, FL 32611, USA. kadambalar@cdm.com

ABSTRACT
Addition of liquids into landfilled waste can result in an increase in pore water pressure, and this in turn may increase concerns with respect to geotechnical stability of the landfilled waste mass. While the impact of vertical well leachate recirculation on landfill pore water pressures has been mathematically modeled, measurements of these systems in operating landfills have not been reported. Pressure readings from vibrating wire piezometers placed in the waste surrounding a liquids addition well at a full-scale operating landfill in Florida were recorded over a 2-year period. Prior to the addition of liquids, measured pore pressures were found to increase with landfill depth, an indication of gas pressure increase and decreasing waste permeability with depth. When liquid addition commenced, piezometers located closer to either the leachate injection well or the landfill surface responded more rapidly to leachate addition relative to those far from the well and those at deeper locations. After liquid addition stopped, measured pore pressures did not immediately drop, but slowly decreased with time. Despite the large pressures present at the bottom of the liquid addition well, much smaller pressures were measured in the surrounding waste. The spatial variation of the pressures recorded in this study suggests that waste permeability is anisotropic and decreases with depth.

Show MeSH