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Heat mitigation in basal compacted clay liners in municipal solid waste landfills
Vihan Jayawardane1,2, Vivi Anggraini3,4, Manh-Vu Tran5
1Civil Engineering Department, School of Engineering, Monash University Malaysia, Jalan Lagoon Selatan, 47500, Bandar Sunway, Selangor Darul Ehsan, Malaysia.
Environmental Science and Pollution Research International
|October 31, 2024
Summary
Elevated temperatures in municipal solid waste (MSW) landfills can cause basal liner cracking. This study shows rockwool insulation and cooling pipes effectively reduce liner temperature and desiccation, extending landfill liner service life.
Area of Science:
- Environmental Engineering
- Geotechnical Engineering
- Materials Science
Background:
- Municipal solid waste (MSW) landfill biodegradation generates heat, increasing waste and basal liner temperatures.
- Elevated temperatures can lead to moisture loss, desiccation, and cracking in compacted clay liners (CCLs).
- Cracked CCLs permit uncontrolled contaminant release, posing significant environmental risks.
Purpose of the Study:
- To investigate temperature-moisture profiles in CCLs under constant elevated waste temperatures (CETs).
- To evaluate the effectiveness of rockwool insulation and cooling pipes in mitigating heat and desiccation in CCLs.
- To assess the impact of varying insulation thickness and cooling pipe flow rates on CCL performance.
Main Methods:
- Simulated elevated waste temperatures (CETs) were applied to CCLs.
- Rockwool insulation layers of varying thicknesses were tested.
- Galvanized steel cooling pipes with varying flow rates were implemented.
- Temperature and moisture variations within the CCL depth were monitored.
Main Results:
- Both rockwool insulation and cooling pipes significantly reduced CCL temperature and desiccation.
- Increased rockwool thickness progressively lowered CCL temperature.
- Increased cooling pipe flow rate under turbulent conditions showed limited impact on temperature and desiccation reduction.
Conclusions:
- Rockwool insulation and cooling pipes are effective heat reduction techniques for MSW landfills.
- These methods can minimize CCL desiccation and extend liner service life.
- Optimizing insulation thickness is crucial, while cooling pipe flow rate may have less impact under turbulent conditions.
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