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Improved design methods for evaluating the performance of landfill double liner systems
Title
Improved design methods for evaluating the performance of landfill double liner systems.
Creator
Shivashankar, Mirle R., Florida Atlantic University, Fluet, J. E. Jr., Reddy, Dronnadula V., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Many modern landfills are constructed with double liner systems. Leachate leakage rates through double liner systems are calculated using recently developed formulations which are theoretically correct for leakage detection system (LDS) materials that have unrestricted lateral flow properties. But their applicability to geonets, the most commonly used LDS material, has yet to be determined. In double liner systems, the leakage through the primary liner, the properties of the LDS material, and...
Show moreMany modern landfills are constructed with double liner systems. Leachate leakage rates through double liner systems are calculated using recently developed formulations which are theoretically correct for leakage detection system (LDS) materials that have unrestricted lateral flow properties. But their applicability to geonets, the most commonly used LDS material, has yet to be determined. In double liner systems, the leakage through the primary liner, the properties of the LDS material, and the slope of the LDS determine the flow patterns in the LDS. These flow patterns are then used to determine the amount of leachate, if any, which leaks through the bottom liner into the ground. This thesis describes the experimental determination of the flow patterns in the geonets and their relationships to established design formulations.
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Date Issued
1995
PURL
http://purl.flvc.org/fcla/dt/15197
Subject Headings
Sanitary landfills--Leaching, Sanitary landfills--Linings, Geosynthetics
Format
Document (PDF)
effect of compressive creep on the structural integrity and drainage capacity of landfill lining systems
Title
The effect of compressive creep on the structural integrity and drainage capacity of landfill lining systems.
Creator
Daniel, Ellen C. Hendrix., Florida Atlantic University, Reddy, Dronnadula V.
Abstract/Description
Landfilling, by all indications, will continue to be the predominant method of solid waste disposal. Traditional civil engineering drainage medium (i.e. sand or gravel) are being replaced by geosynthetics which are much thinner in an effort to create more usable volume for waste. This study examines the effect of compressive creep of geonets as used in leachate collection and detection systems, and how it affects in-plane drainage. HDPE geonet was subjected to a compressive load of 110 psi....
Show moreLandfilling, by all indications, will continue to be the predominant method of solid waste disposal. Traditional civil engineering drainage medium (i.e. sand or gravel) are being replaced by geosynthetics which are much thinner in an effort to create more usable volume for waste. This study examines the effect of compressive creep of geonets as used in leachate collection and detection systems, and how it affects in-plane drainage. HDPE geonet was subjected to a compressive load of 110 psi. The in plane flow rate of municipal solid waste leachate was measured, as well as the change in thickness, for 120 days. In addition, geonet samples were placed between two pieces of HDPE geomembrane. These samples were subjected to a normal load of 140 psi for 120 days. The samples were then inspected for sign of geonet imprint into the geonet, or for strand layover.
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Date Issued
1995
PURL
http://purl.flvc.org/fcla/dt/15229
Subject Headings
Waste disposal in the ground, Sanitary landfills--Linings, Leachate, Geosynthetics
Format
Document (PDF)
role of monitoring wells in modern landfill designs
Title
The role of monitoring wells in modern landfill designs.
Creator
Reddi, Vinod Jayasankar, Florida Atlantic University, Fluet, J. E. Jr., Scarlatos, Panagiotis (Pete) D., College of Engineering and Computer Science, Department of Ocean and Mechanical Engineering
Abstract/Description
Modem technology has led to a new generation of landfill liner systems that are highly efficient at intercepting and removing leachate. Many of the modem liner systems are so effective that little or no leakage occurs through the liner systems. What leakage may occur is so minimal that, although it can be theoretically predicted, it cannot be measured, i.e., the resulting groundwater concentrations are well beneath minimum detection levels of available monitoring well technology. In addition...
Show moreModem technology has led to a new generation of landfill liner systems that are highly efficient at intercepting and removing leachate. Many of the modem liner systems are so effective that little or no leakage occurs through the liner systems. What leakage may occur is so minimal that, although it can be theoretically predicted, it cannot be measured, i.e., the resulting groundwater concentrations are well beneath minimum detection levels of available monitoring well technology. In addition to being highly effective, some modem liner systems are constructed with two liners separated by a drainage medium which detects and removes any leakage through the top liner. These significant improvements in liner system technology have led many landfill designers, operators, and regulators to question the necessity for current monitoring well practices. Currently, landfills are required to have a large number of monitoring wells, and the associated large installation, sampling, and testing costs are inevitably reflected in higher tipping fees or higher taxes. In either case, the costs are borne by the public. If the number and frequency of sampling of monitoring wells could be reduced, significant cost savings could be realized, and the money saved could perhaps be better spent elsewhere. This thesis reports the results of research conducted at eleven landfills constructed with modem landfill liner systems to determine the actual and probable efficacy of the role o: monitoring wells, and conducts a cost-saving analysis to evaluate whether funds would have been better spent elsewhere.
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Date Issued
1994
PURL
http://purl.flvc.org/fcla/dt/15019
Subject Headings
Fills (Earthwork), Leachate, Sanitary landfills--Linings, Waste disposal in the ground
Format
Document (PDF)