Landfill Lining for Leachate Containment

Seymour, K. J.

doi:10.1111/j.1747-6593.1992.tb00768.x

Cited by 13 publications

(11 citation statements)

References 1 publication

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“…Current UK landfiUing practice rarely uses pelletized clay but relies on the kneading action of the sheepsfoot roller to provide a homogenous material. According to Seymour (1992) the use of clay pelleting to maximize homogeneity of the clay is much more common in mainland Europe, a practice advocated by Jesseberger (1993).…”

Section: Discussionmentioning

confidence: 99%

Observations on soil permeability, moulding moisture content and dry density relationships

Wright

Walden

Sangha

et al. 1996

QJEGH

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Increasing use of the coefficient of permeability as a quality control parameter for earthworks, in particular for landfilling, has resulted in many engineers looking to predict coefficients of permeability for clays from more widely available but often widely scattered data. In a number of cases this has led erroneously to the interpretation of the moisture contentcoefficient of permeability relationship as the direct inverse of the moisture content-density relationship. This paper reexamines the original theories proposed for movement of water through soils of differing grain size and goes on to show that extrapolation of the permeability-density relationship for granular soils to finer grained soils is incorrect. Laboratory permeability tests were conducted on four different soil types using the falling head permeameter to investigate the relationships between permeability, dry density and moulding moisture content for each soil. Coefficients of permeability were determined for moisture contents up to the liquid limit of the soil. It is shown that a minimum value of permeability is obtained close to optimum moisture content and that this is maintained to within sensible engineering limits for moisture contents up to that of the liquid limit. Results obtained for predominantly granular soils confirm that permeability is a function of density but, for more cohesive soils, permeability is unaffected by changes in moisture content wet of optimum. Conclusions emphasise that to achieve minimum possible coefficients of permeability there is a need for soil water content at placement to be at or slightly above optimum moisture content and for pelletization of clay material.

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Section: Discussionmentioning

confidence: 99%

Observations on soil permeability, moulding moisture content and dry density relationships

Wright

Walden

Sangha

et al. 1996

QJEGH

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“…A conceptual model of clay liner performance is presented. In most cases, the design criteria require that the clay or mineral liner component is compacted to achieve a permeability no greater than 10 -9 m sec -1 (Barsby 1992;Murray et al 1992;Seymour 1992). Waste Manage Res 2001: 19: 70-88 Printed in UK -all rights reserved Attenuation of landfill leachate by clay liner materials in laboratory columns: 2.…”

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confidence: 99%

Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

2001

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The chemical attenuation of inorganic contaminants in methanogenic landfill leachate, spiked with heavy metals (Cd, Cd, Ni and Zn), by two UK clay liner materials was compared in laboratory columns over 15 months. Ammonium was attenuated by ion-exchange but this attenuation was finite and when exhausted, NH4 passed through the liners at concentrations found in the leachate. The breakthrough behaviour of NH4 could be described by a simple distribution coefficient. Heavy metals were attenuated by sorption and precipitation of metal sulphide and carbonate compounds near the top of the liner. Adequate SO4 and CaCO3 in the liner is necessary to ensure the long term retention of heavy metals, and pH buffering agents added to stabilise reactive metal fractions should be admixed with the liner. Some metals may not be chemically attenuated by clay liners due to the formation of stable complexes with organic and/or colloidal fractions in leachate. Flushing of the liners with oxygenated water after leachate caused mobilisation of attenuated contaminants. Sorbed NH4 was released by the liners but groundwater loadings were manageable. Re-oxidation of metal sulphides under these conditions resulted in the release of heavy metals from the liners when the pH buffering capacity was poor. Contaminant attenuation by the clay liners was similar and the attenuation of NH4 and heavy metals could be predicted from the geochemical properties of the liner using simple tests. A conceptual model of clay liner performance is presented. Chemical attenuation of inorganic pollutants can be included in containment liner design to produce a dual reactive-passive barrier for landfills.

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“…Sites which may be acceptable for a particular category of waste will be assessed by the NRA which will base its assessment on one or a combination of other factors: the sites will be considered on a case-by-case basis, for instance taking into account the depth and nature of the unsaturated zone (see Mather 1989); engineered containment and operational safeguards will be considered (NRA 1992(NRA , 1995Seymour 1992;Walker 1993).…”

Section: Groundwater Protection Policy For England and Walesmentioning

confidence: 99%

The protection of groundwaters from the effects of waste disposal

Hart

Davey²

1995

EGSP

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Powers available to the NRA are summarized. Definitions of waste and groundwater are given. The scale of the problem is described by reference to the legacies of historical 'dilute and attenuate' landfills, mainly occupying disused surface mineral excavations.An explanation is given of an interpretation of the National Rivers Authority Policy and Practice for the Protection of Groundwater in context of waste disposal. Special emphasis is placed on the protection of groundwaters by development control. Reference is made to work regarding best practice for containment and management of leachates generated at landfills.Scenarios are described which are then used to assess the likely impact of the policy on the future of waste disposal.It is concluded that the NRA's policy provides a framework which is being used to promote the practical protection of vital natural groundwater resources.

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Landfill Lining for Leachate Containment

Cited by 13 publications

References 1 publication

Observations on soil permeability, moulding moisture content and dry density relationships

Observations on soil permeability, moulding moisture content and dry density relationships

Attenuation of landfill leachate by clay liner materials in laboratory columns: 2. Behaviour of inorganic contaminants

The protection of groundwaters from the effects of waste disposal

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