Soil Treatment by Bentonite and Fly Ash for Liners of Waste Landfill: A Case Study in Vietnam

Nguyen, Lan Chau

doi:10.21660/2019.63.64022

Cited by 6 publications

(3 citation statements)

References 12 publications

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“…However, bentonite clay is difficult to work in the field and prone to desiccation under dry conditions which leads to an increase in leakage rates [23]. The addition of bentonite to soil [24,25], fly ash and fly ash-soil mixtures reduces its hydraulic conductivity as confirmed by test results [26][27][28]. As mentioned, the most important property in case of sealing layers is hydraulic conductivity of the material, however other properties of fly ash and its mixtures such as compressibility, tensile strength, shear strength are no less important, as presented in the literature [29,30].…”

Section: Introductionmentioning

confidence: 87%

Effect of Bentonite Addition on the Properties of Fly Ash as a Material for Landfill Sealing Layers

Wasil

2020

Applied Sciences

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Landfill sealing layers protect groundwater and soil against contamination from waste leachate. Fly ash, which is a coal combustion by-product, might be used as a substitute material for natural soils to build sealing layers. To improve its properties, different additives can be used. In this study, bentonite in the amounts of 5%, 10% and 15% of the dry mass of fly ash was used as an addition. Compacted fly ash and fly ash-bentonite mixtures were tested in order to verify how bentonite and the amount of addition affect the properties of the materials. Therefore, hydraulic conductivity, as the most important parameter, which determines the suitability of a material for construction landfill sealing layers, were tested. Results indicate that bentonite changes the properties of fly ash and allows the achievement of smaller hydraulic conductivity values. To provide a comparison to the natural soil, sandy silty clay that meets the criteria for natural soils for sealing layers was tested and the differences are presented. Fly ash with 15% of bentonite addition reached a value of hydraulic conductivity for the material suitable to build compacted landfill sealing layers.

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Section: Introductionmentioning

confidence: 87%

Effect of Bentonite Addition on the Properties of Fly Ash as a Material for Landfill Sealing Layers

Wasil

2020

Applied Sciences

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“…The use of compacted soil lining with or without admixture of clay is common due its relatively low cost, accessibility, durability, high resistance to heat, and other factors among other liner materials [1]. Some marginalized materials are also studied as potential landfill liners such as residual soil [2], dredged marine soils [3], compost [4], fly ash used as soil treatment in combination with bentonite [5] among others. Published literature on the use of compacted soil in the Philippines as landfill liner is limited.…”

Section: Introductionmentioning

confidence: 99%

Hydraulic Conductivity Characteristics of a Fine-Grained Soil Potential for Landfill Liner Application

Tiongson

Adajar

2021

GEOMATE

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Sanitary landfills (SLFs) are usually employed as final waste disposal facility to protect public health and the environment. As a result of rapid population growth and urbanization, there is currently a great demand to construct SLFs in the Philippines. The hydraulic conductivity characteristics of remolded samples of a locally abundant fine-grained soil compacted at different compaction energy level is investigated to determine the suitability of the soil as landfill liner material. The hydraulic conductivity of lining system is one very salient feature of the SLF to prevent contamination of nearby soil and water sources. The physical properties of the soil are determined through a series of laboratory tests which includes the grain-size distribution, specific gravity, Atterberg limits, soil classification, Cation Exchange Capacity (CEC), X-ray powder diffraction (XRD) and scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS). The falling head laboratory test was conducted to determine the saturated coefficient of hydraulic conductivity. A numerical model was formulated that can predict hydraulic conductivity as a function of the void ratio. The resulting coefficient of hydraulic conductivity ranges from 1.98 x 10 -6 to 1.0 x 10 -7 cm/sec meet the Philippine standard requirement. The soil being classified as clay loam can readily be used as top lining material. However, additional study on unconfined compressive strength and volumetric shrinkage among other parameters is recommended prior to use of the fine-grained soil as bottom lining material as soil amendment maybe necessary.

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“…A study was made utilizing local materials from Bais City, Negros Oriental as clay liner in the implementation of SLF [2]. Other studies considered some marginalized materials as landfill liners such as residual soil [3], dredged marine soils [4], compost [5], fly ash used as soil treatment in combination with bentonite [6] among others. Compaction is essential in the preparation of a well-compacted soil liner in a sanitary landfill to avoid or minimize the migration of leachate and thereby reduce the risk of groundwater pollution [7].…”

Section: Introductionmentioning

confidence: 99%

Compaction Characteristics of a Fine-Grained Soil Potential for Landfill Liner Application

Tiongson¹,

Adajar²

2020

GEOMATE

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Increasing population growth and urbanization results in increased demand for waste disposal processes and facilities that can protect public health and the environment. In the Philippines, there is a great demand to construct sanitary landfills (SLF) with only 387 local government units (LGUs) or equivalent to 23.86% compliant to date with Republic Act 9003 which mandates all LGUs to use the sanitary landfill. The compaction characteristics of a locally abundant fine-grained soil at different compaction energy levels were investigated as part of a broader study in the suitability of the soil as a landfill liner material. Compaction is essential in the preparation of a well-compacted soil liner in a sanitary landfill to avoid or minimize the migration of leachate and thereby reduce the risk of groundwater pollution. The physical properties are determined through a series of laboratory tests which covers the grain-size distribution, specific gravity, Atterberg limits, soil classification, XRD and SEM-EDX. Correlations to estimate the compaction characteristics at any rational compaction energy (E) are developed. The maximum dry unit weight values at different compactive efforts were used to determine void ratios which were then utilized to compute for the saturated hydraulic conductivity using numerical model for hydraulic conductivity for the same soil type. The resulting hydraulic conductivity ranges from 2.30 x 10-7 to 1.20 x 10-7 cm/sec well above the required value in the Philippines as per RA 9003 and its IRR for the intended Category I and II SLFs application.

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Soil Treatment by Bentonite and Fly Ash for Liners of Waste Landfill: A Case Study in Vietnam

Cited by 6 publications

References 12 publications

Effect of Bentonite Addition on the Properties of Fly Ash as a Material for Landfill Sealing Layers

Effect of Bentonite Addition on the Properties of Fly Ash as a Material for Landfill Sealing Layers

Hydraulic Conductivity Characteristics of a Fine-Grained Soil Potential for Landfill Liner Application

Compaction Characteristics of a Fine-Grained Soil Potential for Landfill Liner Application

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