A coupled hydro-mechanical-biodegradation model for municipal solid waste in leachate recirculation
Shijin Feng1, Wending Fu1, Annan Zhou2
1Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Department of Geotechnical Engineering, Tongji University, Shanghai 200092, China.
Waste Management (New York, N.Y.)
|August 23, 2019
Summary
This study introduces a coupled hydro-mechanical-biodegradation model to simulate municipal solid waste (MSW) landfills. The model analyzes how void ratio changes impact leachate recirculation, improving landfill design.
Area of Science:
- Geotechnical Engineering
- Environmental Engineering
- Waste Management
Background:
- Municipal solid waste (MSW) landfills experience changes in void ratio due to waste weight and biodegradation.
- These changes significantly affect hydraulic properties and leachate recirculation efficiency.
Purpose of the Study:
- To develop and implement an advanced coupled hydro-mechanical-biodegradation (H-M-B) model for MSW landfills.
- To analyze the full coupling process of leachate recirculation considering initial density and biodegradation effects.
Main Methods:
- A novel solver using the finite volume method on the OpenFOAM platform was developed.
- The H-M-B model accounts for volume changes from effective stress, saturation, and degradation.
- It also considers the impact of void ratio changes on hydraulic properties.
Main Results:
- The model demonstrates the critical role of void ratio in influencing hydraulic properties.
- It highlights the effects of compressibility, initial density, and biodegradation on leachate recirculation.
Conclusions:
- The coupled H-M-B model enhances understanding of leachate recirculation in MSW landfills.
- Findings can inform improved design strategies for MSW landfill management.
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