Performance Evaluation of Vertical Wells for Landfill Leachate Recirculation

Jain, Pradeep; Farfour, William M.; Jonnalagadda, Sreeram; Townsend, Timothy G.; Reinhart, Debra R.

doi:10.1061/40789(168)46

Cited by 13 publications

(5 citation statements)

References 9 publications

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“…Initially, the flow rate declined drastically over an order of magnitude. Similar reductions in flow rates have been observed by Jain (2005) and Jain et al (2005) in field experiments conducted at a bioreactor landfill in Florida. The decline in flow rate is associated with the reduction in the hydraulic gradient as liquids are added; the hydraulic gradient decreased because of an increase in the flow path length as the zone of positive pressure expands in the lateral direction.…”

Section: Resultssupporting

confidence: 79%

Steady-state design of vertical wells for liquids addition at bioreactor landfills

Jain¹,

Townsend

Tolaymat

2010

Waste Management

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Section: Resultssupporting

confidence: 79%

Steady-state design of vertical wells for liquids addition at bioreactor landfills

Jain¹,

Townsend

Tolaymat

2010

Waste Management

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“…Addition of liquids is a common practice at landfills as a method to accelerate waste stabilization, and at times, simply to manage leachate [ 1 ]. A variety of methods, including surface application through irrigation or ponds and pressurized injection in buried horizontal trenches or vertical wells, are used to add liquids to the compacted waste [ 2 , 3 ]. A potential concern of the design engineer for such landfills is the impact of an increased hydrostatic pressure in the pore spaces of the waste and cover soil (referred to as pore pressure ) on the shear strength of the waste mass [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well

Kadambala

Townsend

Jain³

et al. 2011

IJERPH

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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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“…Table 3 presents the field test results of the buried vertical well clusters compared to the field test results of conventional vertical wells operated at the same site (Jain et al, 2005a). The average leachate flow rate per unit screen length of the clusters was almost the same or greater compared to the conventional vertical wells.…”

Section: Resultsmentioning

confidence: 99%

“…A variety of techniques can be employed to introduce liquids into landfilled municipal solid waste (MSW), which is a practice that can have a host of benefits including low-cost leachate disposal, more rapid stabilization of waste compared to landfills that do not recirculate liquids, and reduced leachate strength (Townsend et al, 2015). A commonly-employed liquids addition method is the use of constructed vertical wells within the waste mass (Benson et al, 2007; Jain et al, 2005a; Kadambala et al, 2011; Khire and Mukherjee, 2007). Previous investigations using vertical wells that terminate above the waste surface have shown that while substantial volumes of liquid can be added over time, these wells require a great deal of operation and maintenance (Jain et al, 2005a).…”

Section: Introductionmentioning

confidence: 99%

“…A commonly-employed liquids addition method is the use of constructed vertical wells within the waste mass (Benson et al, 2007; Jain et al, 2005a; Kadambala et al, 2011; Khire and Mukherjee, 2007). Previous investigations using vertical wells that terminate above the waste surface have shown that while substantial volumes of liquid can be added over time, these wells require a great deal of operation and maintenance (Jain et al, 2005a). Observed issues have included (i) surface seeps around the injection wells when liquids are added at a hydrostatic head above the surface of the landfill, (ii) air intrusion into the gas collection system when large numbers of vertical wells penetrate the surface, thus reducing gas collection system efficiency, and (iii) differential settlement in the vicinity of the wells (Jain et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of a buried vertical well leachate recirculation system for municipal solid waste landfills

Kadambala

Powell²,

Singh³

et al. 2016

Waste Manag Res

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Vertical liquids addition systems have been used at municipal landfills as a leachate management method and to enhance biostabilization of waste. Drawbacks of these systems include a limitation on pressurized injection and the occurrence of seepage. A novel vertical well system that employed buried wells constructed below a lift of compacted waste was operated for 153 days at a landfill in Florida, USA. The system included 54 wells installed in six clusters of nine wells connected with a horizontally-oriented manifold system. A cumulative volume of 8430 m of leachate was added intermittently into the well clusters over the duration of the project with no incidence of surface seeps. Achievable average flow rates ranged from 9.3 × 10 m s to 14.2 × 10 m s, which was similar to or greater than flow rates achieved in a previous study using traditional vertical wells at the same landfill site. The results demonstrated that pressurized liquids addition in vertical wells at municipal solid waste landfills can be achieved while avoiding typical operational and maintenance issues associated with seeps.

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Performance Evaluation of Vertical Wells for Landfill Leachate Recirculation

Cited by 13 publications

References 9 publications

Steady-state design of vertical wells for liquids addition at bioreactor landfills

Steady-state design of vertical wells for liquids addition at bioreactor landfills

Temporal and Spatial Pore Water Pressure Distribution Surrounding a Vertical Landfill Leachate Recirculation Well

Evaluation of a buried vertical well leachate recirculation system for municipal solid waste landfills

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