Effects of leachate on geotechnical characteristics of sandy clay soil

Harun, N.S.; Ali, Zulfiqar; Rahim, Amir; Lihan, Tukimat; Idris, R. M. W.

doi:10.1063/1.4858709

Cited by 26 publications

(15 citation statements)

References 7 publications

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“…EDX gives the information about presence of elements and composition of materials using slides of prepared samples heated at high temperature of 500-550°C [5]. SEM and EDX are used to observe the surface of cells, microscopic structures and observations and display the three-dimensional objects [5,11].…”

Section: C)mentioning

confidence: 99%

“…Due to leaching, the soil gets contaminated and the properties of soil like specific gravity, maximum dry density, permeability and shear strength changes drastically [7][8][9]. The concentration of the contaminants in the soil can be analyzed with use of SEM and EDX [11]. However, the properties and settlement of MSW and waste soil becomes problematic to determine because of different settlement rates and heterogeneous properties and nature of the waste [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Effect of Municipal Solid Waste Disposal on the Engineering Properties of Soil from a Non-Engineered Landfill

Thakur¹,

Gupta*²,

Ganguly³

2019

IJITEE

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The presents study showed the effect of open dumping on soil characteristics and biodegradation settlement analysis of soil in non-engineered landfill. The contaminated soil is referred to as waste soil which has different settlement rates due to the various categories and complex characteristics of waste. The degradation of waste causing percolation of leachate into soil affecting the strength and stability of soil. This paper includes the analysis of geotechnical properties and settlement analysis of waste soil and its comparison was done with natural soil. The geochemical analysis was carried out by Energy Dispersive X- Ray Spectroscopy (EDX) and Scanning Electron Microscopy (SEM). The elemental analysis of soil exhibited presence of high oxygen and silica content in uncontaminated soil. The analysis depicted that specific gravity, maximum dry density (MDD), permeability and California bearing ratio (CBR) showed decreasing trend variation for polluted soil. It was observed that cohesion for contaminated soil was found to be increased thereby increasing the shear strength of soil. Additionally, temperature, pH and moisture content hold a significant position for assessing the settlement. The settlement of soil due to biodegradation of MSW is estimated using empirical mathematical model for dump site depending upon pH, moisture content and temperature. Additionally, settlement is evaluated keeping in view the settlement due to biodegradation of MSW on soil, which further helped in determination of the suitability of the site for the construction and other recreational purposes.

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Section: C)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effect of Municipal Solid Waste Disposal on the Engineering Properties of Soil from a Non-Engineered Landfill

Thakur¹,

Gupta*²,

Ganguly³

2019

IJITEE

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“…Generally, changes in the geotechnical behaviour of fine grained soils under the influence of inorganic salts depend on the composition of the soil and the pore fluid chemistry, whose source may be through natural processes such as weathering of mudstone (indigenous) or due to activities such as municipal waste storage, accidental spills, or acidic rains (anthropogenic sources). This problem has been recognized recently, and a few studies have been performed to investigate the effects of pore fluid chemistry in the light of pH and ionic concentrations on soil properties (Harun et al, 2015). Yet the effect of pore fluid pH and ionic concentrations on the strength of soil remains unclear.…”

Section: Introductionmentioning

confidence: 99%

Effect of ionic concentrations and ph on the Atterberg limit of cohesive soil

Ike¹

2020

Glo Jnl Pure Appl Sci

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The addition of salt to pore water can affect the behaviour of the soil by influencing the electrochemical forces exist between the solid, liquid and dissolved phases. Changes in geotechnical behaviour of fine grained soils under the influence of ionic concentrations and pH depends on the chemistry of the soil constituents and the pore fluid chemistry. The geotechnical modifications of soil behaviour largely depend on the clay particles and the diversities in the nature of the clay types is due to their specific surface and the net electrical charge on them. Generally, clay particles surface are negatively charged while its edges are positively charged. To preserve electrical neutrality the negative charge of the clay particle is balanced by the attraction of cations which are held between the layers, and on the surface of the particles. The charged clay surface together with the counter–ions in the pore water at the diffuse double layer. The present study focuses on the effect of the ionic concentrations of potassium chloride (KCl) and pH on the liquid limit of fine grained soil. Fall cone test was conducted to measure the liquid limit in different concentrations of the pore fluid, with each of the ionic concentrations prepared in four different pH values (3.5, 5.5, 7.5 and 9.5). From the test results, it was observed that the pH values generally has no significant effect on the liquid limit of the samples; while the liquid limit lightly undulated at lower pH values at ionic concentrations of 0.00001 M, 0.0004 M and 0.003 M, the pH values had least influence at higher ionic concentrations (0.1 M and 1.8 M) of KCL. This behaviour is attributed to the buffering effects of the relatively high solute content at 0.1 M and 1.8 M. On the other hand, the liquid limit decreased with increasing ionic concentrations of KCL. Increasing the ionic concentration reduces the thickness of the diffuse double layer thereby depleting the repulsive forces and hence increases the effective stress leading to flocculation of clay particles that gave rise to the reduction in the liquid limit of the clayey sample Keywords: Liquid Limit, potassium chloride, pore fluid, ionic concentrations, pH

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“…Generally, the value of hydraulic conductivity increases. A number of publications indicate the possible significant impact of landfill leachate on the Atterberg limits and plasticity index (Harun et al., 2013; Sandhya and Shiva, 2017), granulometric composition (Tito et al., 2008; Krupskaya et al., 2017) and specific surface area (Meril, 2014; Krupskaya et al., 2017). The effect of the landfill leachate on these parameters still needs to be identified.…”

Section: Introductionmentioning

confidence: 99%

Assessment of the influence of copper and zinc on the microstructural parameters and hydraulic conductivity of bentonites on the basis of SEM tests

Nartowska

Kozłowski

Gawdzik

2019

Heliyon

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The aim of this study was to determine the influence of potentially toxic metals, such as Cu 2þ and Zn 2þ ions, on the microstructural parameters of bentonites and their hydraulic conductivity (K), calculated based on the empirical formulas for clays according to Hazen-Tkaczukowa (formula 1 based on granulometric parameters) and Kozłowski et al., (2011) (formula 2 based on microstructural parameters). Metal ions influence the microstructure changes of bentonites, which can lead to changes in the geotechnical parameters that are used in empirical K formulas. The research was carried out on model clays (SWy-3, Stx-1b and Slovak bentonite), which were modified by introducing Cu 2þ or Zn 2þ ions into the structure. A significant dependence was observed between an increase in the Cu 2þ ion content in clay and an increase in the pore area. Therefore, the value of the hydraulic conductivity was estimated with the use of formula 2, which proved to be a useful tool for determining hydraulic conductivity in the case of bentonites contaminated with Cu 2þ ions. In contrast, the effect of Zn 2þ ions on the granulometric parameters was significant, and formula 1 proved to be useful tool for determining hydraulic conductivity in the case of bentonites contaminated with Zn 2þ ions. The results showed that the behavior of bentonites saturated with Cu 2þ and Zn 2þ ions differed. Therefore, the authors believe that the empirical formulas of the hydraulic conductivity of the clays saturated with potentially toxic metals should be based on the selected clay parameters dependent upon the nature of the ion.

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Effects of leachate on geotechnical characteristics of sandy clay soil

Cited by 26 publications

References 7 publications

Effect of Municipal Solid Waste Disposal on the Engineering Properties of Soil from a Non-Engineered Landfill

Effect of Municipal Solid Waste Disposal on the Engineering Properties of Soil from a Non-Engineered Landfill

Effect of ionic concentrations and ph on the Atterberg limit of cohesive soil

Assessment of the influence of copper and zinc on the microstructural parameters and hydraulic conductivity of bentonites on the basis of SEM tests

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