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Stabilized red soil-an efficient liner system for landfills containing hazardous materials
R Gopinath1, R Poopathi2, M Vasanthavigar3
1Department of Civil Engineering, University College of Engineering, Tindivanam, Tamil Nadu, 604001, India. gopinathrudramurthy@gmail.com.
Environmental Monitoring and Assessment
|September 16, 2018
Summary
Stabilized red soil with lime and Prosopis juliflora fibers offers an eco-friendly solution for landfill liners. This composite material effectively reduces permeability and enhances strength, preventing aquifer contamination.
Area of Science:
- Geotechnical Engineering
- Environmental Engineering
- Materials Science
Background:
- Hazardous waste disposal in landfills poses risks of leachate contamination.
- Efficient and economical landfill liner systems are crucial for environmental protection.
- Locally available materials are sought for sustainable engineering solutions.
Purpose of the Study:
- To evaluate the suitability of red soil stabilized with lime and Prosopis juliflora fibers as a landfill liner material.
- To investigate the geotechnical properties of the stabilized soil composite.
- To assess the performance of a landfill liner system incorporating the stabilized red soil.
Main Methods:
- Red soil was stabilized with varying percentages of Prosopis juliflora fibers (0.0-1.0%) and a constant 4% lime content.
- Geotechnical tests including plasticity, unconfined compressive strength (UCC), consolidation, permeability, and California Bearing Ratio (CBR) were conducted.
- Scanning Electron Microscopy (SEM) was used to analyze the microstructure of the stabilized soil.
- A landfill liner system was modeled using Visual MODFLOW to simulate performance.
Main Results:
- Stabilization significantly decreased plasticity index, consolidation settlement, permeability, and shrinkage.
- Unconfined compressive strength (UCC) and CBR resistance increased with fiber addition.
- SEM images showed good bonding between lime hydration products and fibers, enhancing stress transfer.
- Visual MODFLOW simulations indicated the stabilized red soil liner effectively prevented aquifer contamination.
Conclusions:
- Red soil stabilized with lime and Prosopis juliflora fibers exhibits desirable geotechnical properties for landfill liner applications.
- The stabilized soil composite offers an economical and sustainable alternative to traditional liner materials.
- The proposed composite liner system demonstrates effective containment of leachate, protecting groundwater resources.
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