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The long-term settlement of landfill waste

The long-term settlement of landfill waste
The long-term settlement of landfill waste
The biodegradation of solid waste materials, the main cause of secondary settlement in landfills, has a significant impact on the post-closure performance of landfill capping systems. Excessive settlement may in turn lead to water ingress and enhanced leachate generation, significantly increasing the risk of harm to the environment. Large-scale long-term laboratory experiments were conducted to identify the rate and magnitude of waste settlement using three purpose-designed test reactors (consolidating anaerobic reactors (CARs)). This paper presents a detailed characterisation of the waste, its associated chemical and physical properties, and the overall volume changes associated with degradation over time. The total magnitudes of settlement after 919 days were 27·6% in CAR 1 (under 150 kPa pressure) and 25·0% in CAR 2 (50 kPa). Long-term secondary settlement was found to be dependent on waste depth—that is, stress dependent. Increased stress (150 kPa) led to a 20% increase in the rates of long-term secondary compression in comparison with a stress level of 50 kPa. Secondary settlement due to biodegradation was found to be of comparable magnitude to the component of secondary settlement caused by mechanical creep (values of 11·1–13·7%). If the settlement behaviour in the CARs approximates to full-scale observations, this data set could be used for validation of quantitative landfill settlement models
landfill, mathematical modelling, waste management & disposal
1747-6526
121-133
Ivanova, L.K.
cd65d56d-322e-457f-ab77-4c61d2a90f12
Richards, D.J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Smallman, D.J.
b619a7d9-6214-407f-9e95-67b0c4bc7278
Ivanova, L.K.
cd65d56d-322e-457f-ab77-4c61d2a90f12
Richards, D.J.
a58ea81e-443d-4dab-8d97-55d76a43d57e
Smallman, D.J.
b619a7d9-6214-407f-9e95-67b0c4bc7278

Ivanova, L.K., Richards, D.J. and Smallman, D.J. (2008) The long-term settlement of landfill waste. Proceedings of the Institution of Civil Engineers - Waste and Resource Management, 161 (3), 121-133. (doi:10.1680/warm.2008.161.3.121).

Record type: Article

Abstract

The biodegradation of solid waste materials, the main cause of secondary settlement in landfills, has a significant impact on the post-closure performance of landfill capping systems. Excessive settlement may in turn lead to water ingress and enhanced leachate generation, significantly increasing the risk of harm to the environment. Large-scale long-term laboratory experiments were conducted to identify the rate and magnitude of waste settlement using three purpose-designed test reactors (consolidating anaerobic reactors (CARs)). This paper presents a detailed characterisation of the waste, its associated chemical and physical properties, and the overall volume changes associated with degradation over time. The total magnitudes of settlement after 919 days were 27·6% in CAR 1 (under 150 kPa pressure) and 25·0% in CAR 2 (50 kPa). Long-term secondary settlement was found to be dependent on waste depth—that is, stress dependent. Increased stress (150 kPa) led to a 20% increase in the rates of long-term secondary compression in comparison with a stress level of 50 kPa. Secondary settlement due to biodegradation was found to be of comparable magnitude to the component of secondary settlement caused by mechanical creep (values of 11·1–13·7%). If the settlement behaviour in the CARs approximates to full-scale observations, this data set could be used for validation of quantitative landfill settlement models

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More information

Published date: 1 August 2008
Keywords: landfill, mathematical modelling, waste management & disposal
Organisations: Civil Engineering & the Environment

Identifiers

Local EPrints ID: 73744
URI: http://eprints.soton.ac.uk/id/eprint/73744
ISSN: 1747-6526
PURE UUID: a6d77cff-0965-4f51-abde-210e1c7c858a

Catalogue record

Date deposited: 11 Mar 2010
Last modified: 13 Mar 2024 22:16

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Contributors

Author: L.K. Ivanova
Author: D.J. Richards
Author: D.J. Smallman

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