Landfill Liner

Product Definition

Landfill Liner is an engineered containment system designed to prevent leachate migration from municipal or hazardous waste landfills into surrounding soil and groundwater, using low-permeability materials and composite structures to meet long-term environmental protection and regulatory compliance requirements.

Technical Parameters and Specifications

• Liner type: Single liner / Composite liner / Double liner system

• Primary geomembrane material: HDPE / LLDPE

• Geomembrane thickness: 1.0 mm – 3.0 mm

• Hydraulic conductivity (geomembrane): ≤1×10⁻¹³ cm/s

• Compacted clay layer permeability: ≤1×10⁻⁷ cm/s

• Sheet width: 5.8 m – 8.0 m

• Carbon black content: 2.0% – 3.0%

• Tensile strength at yield: ≥15 MPa

• Elongation at break: ≥700%

• Interface friction angle (textured liner): 22° – 34°

• Design service life: ≥50 years (buried condition)

Structure and Material Composition

• Waste Layer: Municipal, industrial, or hazardous waste mass

• Protective Geotextile: Nonwoven fabric preventing puncture damage

• Primary Geomembrane: HDPE or LLDPE impermeable barrier

• Leak Detection Layer: Drainage geonet or sand layer

• Secondary Geomembrane: Backup containment layer

• Compacted Clay or GCL: Low-permeability mineral barrier

• Prepared Subgrade: Engineered foundation soil

Manufacturing Process

1. Raw Material Selection: Virgin polyethylene resin with stabilizers

2. Compounding: Addition of carbon black, antioxidants, UV inhibitors

3. Extrusion: Flat die or blown film extrusion to form geomembrane sheets

4. Surface Treatment: Optional texturing for slope stability

5. Thickness Control: Automated gauge and laser monitoring

6. Cooling and Annealing: Dimensional stabilization

7. Quality Testing: Mechanical, oxidative induction, permeability testing

8. Rolling and Packaging: Protection for transportation and storage

Industry Comparison

Application Scenarios

• Municipal solid waste landfills

• Hazardous waste disposal facilities

• Industrial waste containment sites

• Mining tailings and residue storage

• EPC environmental protection projects

Core Pain Points and Solutions

• Leachate leakage risk: Composite landfill liner systems provide redundancy

• Subgrade settlement: Flexible geomembranes accommodate deformation

• Slope instability: Textured liners increase interface shear strength

• Long-term degradation: Stabilized polymers ensure durability over decades

Risk Warnings and Mitigation Measures

• Puncture damage during installation; use protective geotextiles

• Improper welding parameters; require certified welding technicians

• Excessive UV exposure; limit outdoor storage duration

• Inadequate quality control; implement full CQA/CQC programs

Procurement and Selection Guide

1. Identify waste type and regulatory requirements

2. Select appropriate liner system configuration

3. Determine geomembrane thickness based on load conditions

4. Specify smooth or textured surfaces for slope stability

5. Verify laboratory test reports and certifications

6. Evaluate supplier manufacturing capacity and project experience

7. Confirm availability of technical support and documentation

Engineering Case Study

In a municipal landfill expansion project with a design capacity exceeding 3 million cubic meters, a composite landfill liner system consisting of a 2.0 mm HDPE geomembrane and a compacted clay layer was installed. Leak detection monitoring over five years demonstrated zero measurable leachate escape, meeting stringent environmental compliance requirements.

FAQ

1. What is the primary function of a landfill liner? — Prevent leachate migration.

2. Why are composite liners preferred? — They provide redundant protection.

3. What thickness is commonly used? — Typically 1.5–2.5 mm for geomembranes.

4. Is textured liner necessary? — Required on steep slopes.

5. How is liner integrity tested? — Non-destructive seam testing and CQA.

6. What standards apply? — ASTM, GRI-GM13, and local regulations.

7. Can liners accommodate settlement? — Yes, polymer liners are flexible.

8. What is the expected lifespan? — Over 50 years when properly installed.

9. Is on-site welding required? — Yes, thermal fusion welding is standard.

10. Can landfill liners be repaired? — Localized repairs are feasible.

Call to Action

For detailed landfill liner specifications, compliance documentation, engineering consultation, or commercial quotations, please submit your project requirements to receive a professional technical response.

E-E-A-T Author Credentials

This article is prepared by environmental and geotechnical engineers with over 15 years of experience in landfill engineering, containment systems, and EPC project support, serving global contractors, consultants, and procurement teams.