Swelling Pressure of Compacted Clay Liners Contaminated with Inorganic Salt Solutions

Arasan, Seracettin; Akbulut, Rahim Kağan; Yetimoğlu, Temel; Yilmaz, Gonca Kamber

doi:10.2113/gseegeosci.16.4.401

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…This expansion is favored by the increase of pore space in the high salinity leachate side and the shrinking of the Double Diffuse Layer between clay platelets. This pore space is eventually reduced by the swelling pressure generated by the smectite component on the dilute water side (Arasan et al, 2010) and finally stabilized as porewater salinity is homogenized in the LT experiments.…”

Section: Mineralogy and Surface Area Of Claysmentioning

confidence: 99%

Diffusion of landfill leachate through compacted natural clays containing small amounts of carbonates and sulfates

García

Ruiz

Ayora

et al. 2012

Applied Geochemistry

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Diffusion of a synthetic urban landfill leachate through compacted natural illitic clays and the role of reactive accessory minerals (carbonates and gypsum) in the geochemical behavior of major soluble ions are evaluated. The leachate is composed of NH þ 4 and Na + (0.25 M) balanced by Cl À (0.25 M), acetate (0.1 M) and HCO À 3 (0.15 M). The pH is 7.8 and it is typical of the mature stage of organic matter degradation within an urban landfill. Laboratory scale diffusion tests were performed over 4 months (long term experiment, LT) and 2 weeks (short term experiment, ST). The ST experiments were designed to allow the measurement of the Cl À gradient as a diffusion tracer in the compacted clay. In the LT experiments the chemical gradients were already at steady state, but geochemical reactions involving dissolution of gypsum and precipitation of calcite were observed. Evolution of pore-water chemistry, mineralogy, cation exchange properties, and the specific surface of clays were determined. Numerical simulations were carried out using the geochemical code RETRASO. Chloride transport, precipitation of carbonates, pH buffering, and Ca 2+ /NH þ 4 cation exchange reactions took place in the laboratory tests. Apparent Cl À diffusion coefficients were determined by direct modeling of the ST tests and validated with the LT experiments. These coefficients were considered in the simulation of transport coupled with experimentally calculated exchange constants and dissolution/precipitation reactions of gypsum and carbonates. Sulfate reduction coupled with acetate oxidation has been proven to be relevant in the sample with significant concentration of SO 2À 4 (Bailén). This process also includes significant precipitation of carbonates (mainly calcite) and causes a decrease of SO 2À 4 in the porewater.

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Section: Mineralogy and Surface Area Of Claysmentioning

confidence: 99%

Diffusion of landfill leachate through compacted natural clays containing small amounts of carbonates and sulfates

García

Ruiz

Ayora

et al. 2012

Applied Geochemistry

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“…The double layer thickness is directly proportional to the soil's water adsorption capacity and inversely proportional to its permeability. It can be noted that an increase in the double layer thickness decreases the soil's permeability by constricting the flow path available to the permeating liquid to travel between the soil's particles .…”

Section: Resultsmentioning

confidence: 99%

Investigation of Liner Systems in Transport of Organic and Inorganic Contaminants in Sanitary Landfill: A Case Study

Varank

Demi̇r

Adar

et al. 2016

CLEAN Soil Air Water

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In the present work, a pilot‐scale study was carried out to investigate the diffusive transport of phenolic compounds and advective transport of heavy metals through liner systems composed of alternative materials and to evaluate the leachate effect on liner materials’ properties. For this purpose, ten pilot‐scale landfill reactors were operated for a period of about 290 days. Physico‐chemical, mineralogical composition, and geotechnical properties of liner materials were also reported. The results of the study suggest that performance of alternative liner systems have no significant difference in toxic organic contaminant attenuation and clay‐lime mixture were found to be the less effected liner system by leachate. Thereby clay‐lime mixtures can be effectively utilized as a component of landfill liners due to not only chemical, physical, and mineralogical properties but also their high abundance and low cost supply. A two‐layer liner system composed of clay‐lime mixture at the upper part and bentonite‐zeolite mixture at the lower part is recommended. Existence of lime at the upper part will provide improvement in soil properties and reduce leachate effects but will increase hydraulic conductivity by decreasing the thickness of diffuse double layer. A bentonite‐zeolite mixture existing at the lower part will provide adsorption of heavy metals and avoid heavy metal migration.

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“…Inorganic salts represent one type of inexpensive hydration swelling inhibitor by compressing the diffuse double layer of clay particles (Arasan et al, 2010). Potassium chloride and calcium chloride are widely used in drilling fluids and fracturing liquids.…”

Section: Sensitivity Of Coal Coresmentioning

confidence: 99%

Damage mechanism and protection measures of a coalbed methane reservoir in the Zhengzhuang block

Huang

Lei

Qiu

et al. 2015

Journal of Natural Gas Science and Engineering

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Swelling Pressure of Compacted Clay Liners Contaminated with Inorganic Salt Solutions

Cited by 8 publications

References 28 publications

Diffusion of landfill leachate through compacted natural clays containing small amounts of carbonates and sulfates

Diffusion of landfill leachate through compacted natural clays containing small amounts of carbonates and sulfates

Investigation of Liner Systems in Transport of Organic and Inorganic Contaminants in Sanitary Landfill: A Case Study

Damage mechanism and protection measures of a coalbed methane reservoir in the Zhengzhuang block

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