Observations of the impacts of some landfill leachates with clays

Joseph, J. B.; Cressey, G.; Styles, J. R.; Yuen, Sts; Cuadros, Javier

doi:10.1080/09593330309385576

Cited by 5 publications

(1 citation statement)

References 6 publications

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“…The results are organized by landfills and boreholes in Table 7 and include the initial and background values and the percentage decrease. These data show, in general, that these natural clay layers located under the landfills represent an effective barrier to the migration of leachate contaminants, in agreement with other studies (Bellir et al, 2005;Chen et al, 2005;Frascari et al, 2004;Hermanns Stengele and Plötze, 2000;Joseph et al, 2003;Rowe et al, 1995;Techer et al, 2001;Thornton et al, 2001). The average data (Table 7) show that these natural clayey layers located under the landfills represent a good barrier to the migration of the main leachate soluble contaminants, which in general terms, become attenuated in 0.2-2.2 m after 9-24 years of waste deposit.…”

Section: Landfill Agesupporting

confidence: 92%

Pollution profiles and physicochemical parameters in old uncontrolled landfills

et al. 2012

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The long-term effectiveness of the geological barrier beneath municipal-waste landfills is a critical issue for soil and groundwater protection. This study examines natural clayey soils directly in contact with the waste deposited in three landfills over 12 years old in Spain. Several physicochemical and geological parameters were measured as a function of depth. Electrical conductivity (EC), water-soluble organic carbon (WSOC), Cl(-), NH(4)(+), Na(+) and exchangeable NH(4)(+) and Na(+) were used as parameters to measure the penetration of landfill leachate pollution. Mineralogy, specific surface area and cationic-exchange capacities were analyzed to characterize the materials under the landfills. A principal component analysis, combined with a Varimax rotation, was applied to the data to determine patterns of association between samples and variables not evident upon initial inspection. The main factors explaining the variation in the data are related to waste composition and local geology. Although leachates have been in contact with clays for long time periods (13-24 years), WSOC and EC fronts are attenuated at depths of 0.2-1.5m within the clay layer. Taking into account this depth of the clayey materials, these natural substrata (>45% illite-smectite-type sheet silicates) are suitable for confining leachate pollution and for complying with European legislation. This paper outlines the relevant differences in the clayey materials of the three landfills in which a diffusive flux attenuation capacity (A(c)) is defined as a function (1) of the rate of decrease of the parameters per meter of material, (2) of the age and area of the landfill and (3) of the quantity and quality of the wastes.

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Section: Landfill Agesupporting

confidence: 92%

Pollution profiles and physicochemical parameters in old uncontrolled landfills

et al. 2012

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A methodology to characterize a sanitary landfill combining, through a numerical approach, a geoelectrical survey with methane point-source concentrations

Jácome

Costanzo-Alvarez

Aldana

et al. 2021

Environmental Technology & Innovation

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Processes and impacts of acid discharges on a natural substratum under a landfill

Regadío

García

Rodríguez-Rastrero

et al. 2013

Science of The Total Environment

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Analyses of substratum samples under a landfill were performed to assess the pollution impact of waste over a clay-sand material after nine years of exposure. These samples presented different illite/kaolinite ratios and an acid pH, especially low near the waste/soil contact in a 1-1.5 m soil thickness with low density and despite the basic pH of the collected actual methanogenic leachate. This study has raised the effects of a presumably acid stage in the waste leachate on the substratum final quality of clay and its physical-chemical properties as an attenuation buffer. These effects were the dissolution of carbonate minerals, decrease of dry density, increase of hydraulic conductivity, release of metals and formation of clays with low cationic exchange capacity (CEC) as kaolinite. The large presence of H(+) and Al(OH)(3-x)(x+) depleted the neutralizing capacity of the substratum and occupied exchangeable sites, decreasing therefore the available sites for retaining leachate pollutants, which traveled further than the first-meter depth of the substratum. In order to combat and prevent pollution as well as to preserve the good barrier properties under new landfills it is proposed to select illitic materials better than kaolinitic substratum, to avoid acid landfilling and if not possible to add lime.

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Observations of the impacts of some landfill leachates with clays

Cited by 5 publications

References 6 publications

Pollution profiles and physicochemical parameters in old uncontrolled landfills

Pollution profiles and physicochemical parameters in old uncontrolled landfills

A methodology to characterize a sanitary landfill combining, through a numerical approach, a geoelectrical survey with methane point-source concentrations

Processes and impacts of acid discharges on a natural substratum under a landfill

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