Membrane effects in clay-lined inward gradient landfills

Whitworth, Thomas M.; Ghazifard, Akbar

doi:10.1016/j.clay.2008.07.026

Cited by 9 publications

(2 citation statements)

References 14 publications

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“…Such barriers can be classified mainly as resistive or capacitive (Committee to Assess the Performance of Engineered Barriers, 2007). Resistive barriers are based either on their resistance to advective transport (non-permeable barriers) or to pollutant diffusive transport (semipermeable membranes such as bentonites; Whitworth & Ghazifard, 2009;Kang & Shackelford, 2010). Capacitive barriers retain pollutants by adsoption, redox or dissolutionprecipitation reactions.…”

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confidence: 99%

Geochemical processes in compacted clay in contact with an acid landfill leachate: laboratory experiments and modelling results

2014

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Clays are commonly used as liners in urban landfills. However, the reactive processes with landfill leachates, and in particular the role of accessory minerals is poorly known. The aim of this work is to evaluate the diffusion of a synthetic urban landfill leachate through compacted natural smectite-illitic clays containing carbonates and sulfates and to predict the functioning of the clay liner for different minor mineral proportions. The leachate, characterized by acidic pH conditions and high organic matter content, is a typical aqueous solution formed in the acetogenic phase of organic matter degradation in urban landfill areas. Medium-scale (11 cm) laboratory diffusion tests were performed over 77 days. Chloride diffusion coefficients, porosity changes, cation exchange constants and the sulfate reduction rate were quantitatively assessed by means of reactive transport modelling. The exchange capacity of the clays is responsible for NH4+ retention. However, the presence or absence of gypsum in the initial clay rock controls the functioning of the liner. Gypsum dissolution ensures a high sulfate concentration in the porewater and enhances the acetate consumption via sulfate reduction. Gypsum dissolution and the concomitant calcite precipitation do not significantly alter the porosity of the clay rock.

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Geochemical processes in compacted clay in contact with an acid landfill leachate: laboratory experiments and modelling results

2014

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“…Schleiss et al (2008) [23] by studying three reservoir dams in mountainous regions of Swiss found that the muddy flow was the most important factor in speeding up the sedimentation in these reservoirs. Withworth and Ghazifard (2009) [24] in a research entitled "the membrane effects in clay-lined inward gra-dient landfills" refer to this subject that in the ditches of burial place of sweepings for controlling the transfer of pollution outward and underground waters, people cover the internal slope of the cavity with clay that this coverage acts as the semi-osmosis membrane. Tekwa et al (2010) [25] The samples taken (before and after making muddy the water) as well as the saturated sample taken from the soil used for making muddy the water were tested to determine the qualitative parameters using standard methods, and Wilcox and Schuler samples were prepared.…”

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confidence: 99%

“Water-Colouring” and Geomorphologic Features of the Marl Hills in Changing Quality of Soil and Water

Montaseri¹,

Amirahmadi²,

Asadi³

et al. 2017

CWEEE

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Water scarcity has always been one of the most important obstacles in the process of agricultural development in arid and low-rainfall climates. In farming, the water quality also plays an important role; as the poor quality of water can be one of the limiting factors in this sector that in addition to the agricultural problems has also caused soil problems. In this paper, we introduce and study an indigenous method of water conservation and soil protection in the east of Iran termed as "water-colouring" and the role of geomorphologic features of marl hills in one of the rivers located in the southern slopes of the Joghtay Mountain (Kalateh-Sadat Watershed). In this study, field observation, sampling and analysis of water and sediment, physicochemical experiments, SPSS software for statistical analysis and satellite images have been used to produce digital models. Finally, the effects of muddy water and clear water have been compared in terms of chemical quality and productivity of agricultural land. The results show that the method of water-colouring is the best indigenous-economical method for moisture retention and regeneration of the agricultural land soil. Given the statistical reasons and studying the other researches in this field, water-colouring causes change texture and soil composition, fertility of agricultural land and reduce the losses due to evaporation and infiltration.

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Experimental study of the environmental and geotechnical properties of landfills under long-term leachate effects: macro–microscopic tests on in situ clays

Wan

Guo

Liu

et al. 2022

Bull Eng Geol Environ

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Membrane effects in clay-lined inward gradient landfills

Cited by 9 publications

References 14 publications

Geochemical processes in compacted clay in contact with an acid landfill leachate: laboratory experiments and modelling results

Geochemical processes in compacted clay in contact with an acid landfill leachate: laboratory experiments and modelling results

“Water-Colouring” and Geomorphologic Features of the Marl Hills in Changing Quality of Soil and Water

Experimental study of the environmental and geotechnical properties of landfills under long-term leachate effects: macro–microscopic tests on in situ clays

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