Long-term moisture measurements in large-scale bioreactor cells using TDR and neutron probes

Staub, Matthias; Gourc, Jean-Pierre; Laurent, Jean‐Paul; Kintzuger, C.; Oxarango, Laurent; Benbelkacem, Hassen; Bayard, Rémy; Morra, Christophe

doi:10.1016/j.jhazmat.2010.04.009

Cited by 22 publications

(12 citation statements)

References 27 publications

(61 reference statements)

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“…Once the system attained steady state conditions, the effect of subsequent gravity drainage for four weeks on moisture distribution is investigated. The changes in saturation, pore water pressure, and leachate outflow at the bottom of the landfill during the gravity drainage are computed.The model is validated in comparison with the experimental results presented by Staub et al[7] (Figure 4). The volumetric moisture content measurements for days 31, 32,…”

mentioning

confidence: 79%

“…A large-scale laboratory study on the long-term moisture distribution in MSW during leachate recirculation was reported by Staub et al [7] ( Figure 3(a)). This study collected MSW and the leachate to be recirculated from an active landfill in France.…”

Section: Staub Et Al [7] Studymentioning

confidence: 94%

“…Cell B1 with MSW compacted with a dry density of 0.45 t/m 3 and initial volumetric moisture content of 22% was saturated initially for 30 days with 328 liters of leachate injected from the bottom and then allowed gravity drainage drained for 199 days. Data from the upper 0.3 m and bottom 0.1 m was not provided by Staub et al [7] due to measurement problems. The experimental cell B1 was simulated in a two-phase flow model using a model domain of 1.1 m wide by 1.2 m high (Figure 3 87, and 199 are in good agreement with the experimental data ( Figure 4(a)).…”

Section: Staub Et Al [7] Studymentioning

confidence: 99%

“…Therefore, the volumetric moisture content is higher near the drainage layer. The Staub et al [7] laboratory study did not include a few data points near the top and bottom of the cell because of errors, but the model simulation results do include data for these locations. The development of negative pore water pressure in the cell as shown in Figure 4(b) and it can be seen that the moisture content is almost the same from the cell height 0.25 m to the height of 0.9 m and the variation in the pore pressure in this region is almost negligible.…”

Section: Staub Et Al [7] Studymentioning

confidence: 99%

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Validation of Two-Phase Flow Model for Leachate Recirculation in Bioreactor Landfills

Reddy

Giri

Kulkarni

2014

Journal of Waste Management

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A numerical two-phase flow model is presented to determine the moisture distribution and pore water and gas pressures within unsaturated municipal solid waste (MSW) in bioreactor landfills during leachate recirculation. The numerical model used is the Fast Lagrangian Analysis of Continua (FLAC), which is based on finite difference approach. The model governing equations and mathematical formulations is briefly explained. Validation of the model is examined by simulating the published laboratory and field studies and published modeling studies. Overall, the two-phase flow model is found to produce results comparable with those of the published studies. This assures that the model can be used for the prediction of moisture distribution and for the rational design of leachate recirculation systems in bioreactor landfills.

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mentioning

confidence: 79%

Section: Staub Et Al [7] Studymentioning

confidence: 94%

Section: Staub Et Al [7] Studymentioning

confidence: 99%

Section: Staub Et Al [7] Studymentioning

confidence: 99%

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Validation of Two-Phase Flow Model for Leachate Recirculation in Bioreactor Landfills

Reddy

Giri

Kulkarni

2014

Journal of Waste Management

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“…Nondestructive methods including: neutron probe (NP), electrical resistance sensors (ERS), electromagnetic techniques (EM) (i.e., time domain reflectometry and transmissivity, TDR and TDT), electrical resisitivity tomography (ERT), and partitioning gas tracer test (PGTT), have been implemented to determine the moisture content and moisture movement in MSW (e.g., Gawande et al 2003;Imhoff et al 2003;Imhoff et al 2007;Carpenter et al 2008;Staub et al 2009;Staub et al 2010b;Shihada et al 2013). …”

Section: Moisture Contentmentioning

confidence: 99%

Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Cox¹

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Effects of Waste Placement Practices on the Engineering Response of MunicipalSolid Waste Jason T. Cox An extensive laboratory and field investigation was conducted at Santa Maria Regional Landfill (SMRL) in Santa Maria, California to determine the effects of waste placement practices on the engineering response of municipal solid waste (MSW). Laboratory and field testing was used to determine the engineering properties and monitor field response of MSW.The specific gravity (G s ) of manufactured MSW (MMSW), fresh MSW (FMSW), and old MSW (OMSW) was determined experimentally using a modified version of standard soil testing procedures. Effects of particle size, compactive effort, and degradation on the specific gravity of waste were evaluated. Specific gravity of manufactured waste samples increased with decreasing particle size, with compaction, and with increased degradation. The average specific gravity of uncompacted MMSW samples was 1.333, 1.374, and 1.424 for coarse, medium, and fine particle sizes, respectively. Specific gravity of coarse, medium, and fine MMSW samples compacted at dry of optimum ( = 30%) was determined to be 1.497, 1.521, and 1.552, respectively and at wet of optimum ( = 90%) to be 1.500, 1.542, and 1.570, respectively. The compacted and uncompacted specific gravity of fresh MSW was lower than manufactured and old MSW. The average G s of uncompacted and compacted fresh MSW was 1.072 and 1.208, respectively whereas old MSW had G s of 2.201.v Additional physical and engineering properties of MSW were determined for fresh and old wastes. A total of 8 magnetic extensometer settlement arrays and 4 thermocouple arrays were installed in old wastes. The settlement and temperature data were collected for an approximate duration of 1 year. In addition, laboratory experiments were conducted to determine the particle size distribution, organic content, and moisture content of fresh waste sampled from the active face of the landfill and from old waste sampled from different depths.The particle size distribution of OMSW was comparable to a well-graded coarsegrained soil. The average baseline moisture content of incoming MSW at SMRL was 42.7% (dry-weight basis). The average moisture content of residential MSW, commercial MSW, and self-delivered MSW were determined to be 57.7, 46.3, and 12.0%, respectively. The organic content of fresh and old MSW was determined to be 77.2 and 23.5%, respectively. Temperature increased over time due to heat generation of the waste mass. The temperature increased on average 3 to 6°C between the initial and final day of measurements for wastes that were 0.3 to 9 years old.Fresh and old wastes at SMRL exhibited unique compression behavior. A majority of the waste was undergoing secondary compression characterized using a secondary compression ratio ( ′ ) ranging from 0.013 to 0.067 with an average of 0.030. In addition, the fresh and old wastes exhibited recompression behavior. Fresh waste lifts were determined to be slightly overconsolidated such that the self-weig...

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Two-Phase Flow Modeling to Evaluate Effectiveness of Different Leachate Injection Systems for Bioreactor Landfills

Reddy

Kumar

Kulkarni

2019

Environ Model Assess

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Long-term moisture measurements in large-scale bioreactor cells using TDR and neutron probes

Cited by 22 publications

References 27 publications

Validation of Two-Phase Flow Model for Leachate Recirculation in Bioreactor Landfills

Validation of Two-Phase Flow Model for Leachate Recirculation in Bioreactor Landfills

Effects of Waste Placement Practices on the Engineering Response of Municipal Solid Waste

Two-Phase Flow Modeling to Evaluate Effectiveness of Different Leachate Injection Systems for Bioreactor Landfills

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