In 2024, a large-scale landfill containment project in Ontario, Canada, required a high-performance geomembrana system to prevent leachate seepage and protect surrounding groundwater. Due to the area’s fluctuating climate and the landfill’s complex geological conditions, the project owner sought a durable, flexible, and chemically resistant liner system capable of long-term environmental protection.
After thorough technical evaluation and on-site consultation, an HDPE geomembrana system was selected as the optimal solution.
Material Specifications
The selected HDPE geomembrana offered exceptional tensile strength, UV resistance, and low permeability, ensuring structural integrity even under cyclic freezing and thawing conditions common in Canadian climates.
Subgrade Preparation and Installation Process
Before liner placement, the landfill subgrade underwent comprehensive treatment to achieve a smooth and stable foundation.
Surface Leveling:
The compacted soil base was graded to a slope of 3%, ensuring proper drainage and minimizing stress concentrations on the liner.
Compaction & Cushion Layer:
A 20 cm-thick sand cushion was applied to protect the geomembrana from puncture by sharp particles.
Geomembrana Deployment:
The HDPE geomembrana sheets were unrolled using a mechanical spreader, avoiding wrinkles and excessive tension. All overlaps were kept between 100–150 mm.
Seam Welding:
Hot wedge fusion was used for primary seam joints.
Extrusion welding was applied at corners, irregular areas, and penetrations.
Every weld was visually inspected and air pressure tested.
Anchor Trench Installation:
The liner edges were fixed within concrete-filled anchor trenches to prevent movement during backfilling or settlement.
Quality Assurance and Testing
To ensure compliance with ASTM and GRI standards, multiple QA/QC tests were conducted both on-site and in laboratories:
Shear and peel strength tests for welded seams
Tensile strength and elongation tests for liner integrity
Vacuum box testing for non-destructive verification
Spark testing at patch areas for leak detection
All test results met or exceeded project specifications, confirming a leak-free barrier performance.
Performance and Environmental Benefits
After installation, the HDPE pond liner system provided excellent containment of leachate, effectively isolating waste from groundwater. Key performance indicators include:
Permeability coefficient: < 1×10⁻¹⁴ cm/s
Chemical resistance: Stable against acids, alkalis, and organic solvents
Thermal stability: Maintained flexibility and sealing performance between -45°C to +70°C
UV resistance: Over 15 years of outdoor durability without embrittlement
This geomembrana system significantly extended the landfill’s service life and reduced long-term maintenance costs.
The HDPE geomembrana solution demonstrated its technical superiority and adaptability in harsh landfill environments in Canada.
Its combination of mechanical strength, chemical resistance, and reliable welding performance makes it the preferred choice for landfill lining, wastewater containment, and mining tailings projects worldwide.