Workability, compressibility and hydraulic conductivity of zeolite-amended clayey soil/calcium-bentonite backfills for slurry-trench cutoff walls

Du, Yan-Jun; Fan, Ri-Dong; Liu, S.Y.; Reddy, Krishna R.; Jin, Fei

doi:10.1016/j.enggeo.2015.06.020

Cited by 104 publications

(21 citation statements)

References 47 publications

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“…The factor that determines permeability is the size of the soil grain, where the smaller the size of the soil grain, then the possibility of water to pass through the medium is also smaller. The value of permeability of a landfill liner should not exceed 1 x 10 -9 cm/s so that water cannot pass through the layer [31]. The permeability of the liners in each reactor is illustrated in table 4.…”

Section: Coefficient Of Permeabilitymentioning

confidence: 99%

The potential of semi-permeable bentonite and zeolite composite on the reduction of Pb (II) concentration in landfill

et al. 2020

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An alternative material that could be used as a liner, which can avert the heavy metal migration from landfill to soil, is the combination between bentonite and zeolite. This study aims to analyze the Pb2+ adsorption capacity of the liner and permeability of bentonite with the addition of zeolite in several percentages. There were four different types of composite in the experiment, such as pure bentonite (BZ0), bentonite + zeolite 2% (BZ2), bentonite + zeolite 5% (BZ5), and bentonite + zeolite 8% (BZ8). Bentonite and zeolite composite was inserted into a cylindrical reactor, which was compacted to adjust the condition of the study to be similar with existing condition in the landfill. This study was conducted until the leachate produced and lead concentration was tested using samples from the liner and leachate in the outlet. The results showed that the highest efficiency of lead reduction was obtained from BZ8 with the percentage of 95.2%, while the highest permeability coefficient was found in BZ8 with the value of 7.76 x 10−11 cm/s. The addition of zeolite has been proven to be able to reduce the lead concentration of leachate, but it increased the possibility of leakage.

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Section: Coefficient Of Permeabilitymentioning

confidence: 99%

The potential of semi-permeable bentonite and zeolite composite on the reduction of Pb (II) concentration in landfill

et al. 2020

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“…Landfill liner should not have a greater permeability value of 1x10-9 cm/s [21]. In order to examine whether any alteration on the hydraulic performance of zeolite induction to bentonite, falling head method was performed to measure the hydraulic conductivity of all mixtures.…”

Section: Permeability Testingmentioning

confidence: 99%

Stability Performance of the Mixture of Bentonite and Zeolite as Landfill Liner

et al. 2019

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In some areas, compacted clay liner is chosen as leachate barrier for solid waste landfill. Due to the typical shape of the landfill, the compacted clay liner will be rested both in flat and sloping ground. Since clay has characteristics of low shear strength, improvement of shear stability of compacted clay liner is required. One of the stability methods to increase the shear strength of clay is by adding another material which has higher shear stability. In this study, bentonite is used to represent clay liner while zeolite is utilized as stabilizer material. Four compositions of bentonite with 0%, 5%, 10%, 15% addition of zeolite were prepared to investigate the stability performance of the mixtures. The results indicate that the addition of zeolite into bentonite has increased the friction angle of the bentonite. However, the addition of zeolite seems to alter the hydraulic performance of bentonite. The highest permeability is demonstrated by the bentonite with 15% of zeolite. Whether the permeability increases, the hydraulic performance of all the mixtures are still met the maximum permeability allowed for landfill liner.

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“…Hydraulic conductivity can be determined by using hydraulic field tests for bedrock aquifers, such as a pumping test, a slug test, and a water pressure test, and hydraulic field tests for unconsolidated formations, such as a con penetration test [44][45][46], a pumping test [47,48], a slug test, and a grain size analysis [49]. Specifically, the hydraulic conductivity of contaminated soils can be evaluated by [50,51]. In this study, the hydraulic conductivity values were determined by a using grain size analysis and a slug test.…”

Section: Hydrogeological Surveymentioning

confidence: 99%

Indication of Groundwater Contamination Using Acesulfame and Other Pollutants in a Rural Area of Korea

Lee

Hamm

Yun

et al. 2018

Water

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Approximately 40,000 chemical products are currently used in Korea; these products can contaminate the groundwater/soil, the surrounding environment, and organisms for extended periods of time. In this study, a hydrological field survey, a water quality analysis, and groundwater modeling were performed to identify the source and transport path of pollution that was caused by inorganic matter and artificial sweeteners, especially acesulfame, in the groundwater of an agricultural area in Chungnam Province, Korea. In the study area, a higher concentration of acesulfame displayed a spatial distribution similar to nitrate-nitrogen concentration. The characteristics of the groundwater flow and the distribution of the acesulfame were simulated using the Visual MODFLOW Classic Interface ver. 2014.1 and the MT3DMS module, respectively. The modeled area was divided into hilly (southern), residential (northwest), and agricultural (northeast) zones. The stream’s boundary was set to be the drainage channel in the southern hilly zone. From the simulation, we found that acesulfame spread actively from the source for 1–3 years before it reached equilibrium in the northern part of the model domain (the area downstream of the stream’s boundary). The concentration of acesulfame in the agricultural zone of the model domain decreased after five years, and it reached the steam boundary and residential zone within 10 years. After 10 years, most of the acesulfame was discharged from the agricultural zone and the hilly zone, while the concentration in the residential zone was approximately the same. Acesulfame is considered to be a potential indicator of man-made contamination for use in the management of groundwater quality.

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Workability, compressibility and hydraulic conductivity of zeolite-amended clayey soil/calcium-bentonite backfills for slurry-trench cutoff walls

Cited by 104 publications

References 47 publications

The potential of semi-permeable bentonite and zeolite composite on the reduction of Pb (II) concentration in landfill

The potential of semi-permeable bentonite and zeolite composite on the reduction of Pb (II) concentration in landfill

Stability Performance of the Mixture of Bentonite and Zeolite as Landfill Liner

Indication of Groundwater Contamination Using Acesulfame and Other Pollutants in a Rural Area of Korea

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