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A Versatile Automated Platform for Micro-scale Cell Stimulation Experiments

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Decoupling MSW settlement into mechanical and biochemical processes--modelling and validation on large-scale setups.

J-P Gourc¹, M J Staub, M Conte

¹LTHE, Grenoble University, BP 53, 38041 GRENOBLE Cedex, France.

Waste Management (New York, N.Y.)

|April 13, 2010

Summary

Predicting landfill settlements is crucial for cover integrity. This study quantizes biodegradation

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Area of Science:

Geotechnical Engineering
Environmental Science
Biogeochemistry

Background:

Landfill cover integrity relies on accurate forecasting of waste settlements.
Secondary settlements of Municipal Solid Waste (MSW) are influenced by biodegradation.
Existing models often lack a comprehensive approach to biomechanical interactions in MSW.

Purpose of the Study:

To quantify the influence of biodegradation on secondary settlements of Municipal Solid Waste (MSW).
To develop and validate a biomechanical model for predicting MSW secondary settlements.
To assess the impact of waste pre-treatment and operational conditions on settlement components.

Main Methods:

Analysis of experimental data from pilot and literature studies on MSW settlements.
Development of a one-dimensional biomechanical model incorporating mechanical (creep) and biochemical (degradation) settlements.
Evaluation of biochemical settlements based on biogas production and validation using large-scale experimental data.

Main Results:

A novel method for predicting biochemically-induced settlements, linked to biogas production, was proposed and validated.
The model successfully separates and quantifies mechanical and biochemical settlement contributions.
Waste pre-treatment (e.g., shredding, biological pre-treatment) and operational conditions (e.g., leachate injection) significantly affect settlement components.

Conclusions:

Settlement in MSW landfills can be accurately predicted by combining mechanical and biochemical components.
Biogas production serves as a reliable indicator for estimating biochemically-induced settlements.
Landfill settlement monitoring is a relevant indicator for assessing the state of waste biodegradation.