2mm HDPE Geomembrane Liner for Biogas Digester
A 2mm HDPE geomembrane liner can be used for biogas digesters to provide containment and prevent the seepage of liquid or gas.HDPE (high-density polyethylene) geomembranes are known for their excellent impermeability. A 2mm thick liner made of HDPE provides a reliable barrier to prevent the leakage of liquid or gas from the biogas digester. This is important for maintaining the integrity of the digester and ensuring the efficient collection and utilization of biogas.
HDPE geomembranes offer high resistance to a wide range of chemicals, including those present in biogas digesters. Biogas digesters often contain corrosive substances, such as organic acids and hydrogen sulfide. The chemical resistance of the HDPE liner helps protect against degradation and extends the service life of the digester.
HDPE geomembranes are durable and have a long service life. They are resistant to UV radiation, weathering, and biological degradation. This makes them well-suited for outdoor applications, providing reliable containment and protection against environmental factors.
HDPE geomembranes are flexible and can conform to the shape of the biogas digester. This allows for easy installation and ensures that the liner covers the entire surface area, minimizing the risk of leaks or seepage.
The use of a 2mm HDPE geomembrane liner in a biogas digester helps prevent the release of potentially harmful substances into the environment. It ensures that the digester operates efficiently while minimizing the risk of groundwater contamination or soil pollution.
Parameter
ltem | Detailed item | Unit | Standard | Test Frequency | GS075 | GS010 | GS015 | GS020 | GS030 |
Mechanical Properties | Thickness | mm | D5199 | per roll | 0.75 | 1.00 | 1.50 | 2.00 | 3.00 |
Density | D1505/D792 | 90.000kg | 0.94 | ||||||
Tensile Properties | |||||||||
Yield Strength | KN/m | D6693 Type Iv | 9.000 kg | 11 | 15 | 22 | 29 | 44 | |
Break Strength | KN/m | 20 | 27 | 40 | 53 | 80 | |||
Yield Elongation | % | 12 | 12 | 12 | 12 | 12 | |||
Break Elongation | % | 700 | 700 | 700 | 700 | 700 | |||
Tear Resistance | N | D1004 | 20.000kg | 93 | 125 | 187 | 249 | 374 | |
Puncture Resistance | N | D4883 | 20.000kg | 240 | 320 | 480 | 640 | 960 | |
Stress Crack Resistance | Hr. | D5397 | per GRl GM-10 | 300 hr. | |||||
Carbon black content | % | D4218 | 9.000kg | 2.0-3.0% | |||||
Carbon black dispersion | D5596 | 20.000kg | For 10 different views: 9 in Categories 1 or 2 and 1 in Category 3 | ||||||
Reference Properties | Oxidative Induction Time | ||||||||
Standard OlT | min | D3895 | 90.000kg | 100 min | |||||
High pressure OlT
| D5885 | 90.000kg | 400 min | ||||||
Oven Aging at 85°C retained after 90 days
| % | D5721 | per each formulation | 55% | |||||
Standard OlT | D3895 | 80% | |||||||
High pressure OlT | D5885 | 80% | |||||||
UV Resistance | |||||||||
High Pressure OlT_% retained after 1600 hrs | % | D5885 | per each formulation | 50% | |||||
Roll Size | Roll widthe | m | 7 | 7 | 7 | 7 | 7 | ||
Roll Length | m | 280 | 210 | 140 | 105 | 70 | |||
Size stability | % | 2% | |||||||
2mm HDPE Geomembrane Liner for Biogas Digester Features
Excellent Chemical Resistance.
Outstanding Stress Crack Capacity.
Lowest Permeability.
Excellent UV Resistance.
Stable Low Temperature Embrittlement Resistance.
Proven Performance.
Fast Deployment.
Easy Transportation.
ISO9001 Certificated Geomembrane Factory.
Meet or Exceed All Aspects of GRI GM13.
Complete Width and Thickness Specifications.
Competitive Factory Price.
ODM/OEM are Available.
Applications of 2mm HDPE Geomembrane Liner for Biogas Digester
High-Density Polyethylene (HDPE) geomembranes are the primary containment solution in anaerobic digestion systems. Specifically, the 2mm HDPE geomembrane liner is widely adopted in biogas digester construction due to its superior chemical resistance, impermeability, and mechanical strength.
This article provides a detailed technical review of 2mm HDPE liners used in biogas digesters, including material composition, engineering considerations, compliance with international standards, installation protocols, and real-world application scenarios.
Why Use a 2mm HDPE Geomembrane in Biogas Digesters?
Biogas digesters operate under anaerobic, corrosive, and moisture-rich conditions. A geomembrane must provide long-term resistance to:
Organic acids
Methane and other gases
High moisture content
Bacterial activity
UV radiation (for exposed areas)
A 2mm thickness offers enhanced puncture resistance, long service life, and compatibility with aggressive landfill-type environments commonly found in anaerobic digestion tanks and lagoons.
Technical Specifications of 2mm HDPE Geomembrane
| Property | Value | Test Method |
|---|---|---|
| Thickness | 2.0 mm ± 5% | ASTM D5199 |
| Density | ≥ 0.940 g/cm³ | ASTM D1505 |
| Tensile Strength at Yield | ≥ 29 kN/m | ASTM D6693 |
| Elongation at Break | ≥ 600% | ASTM D638 |
| Puncture Resistance | ≥ 600 N | ASTM D4833 |
| Carbon Black Content | 2.0–3.0% | ASTM D4218 |
| Hydrostatic Resistance | ≥ 2.0 MPa | ASTM D 751 |
| Gas Permeability | < 1.0 x 10⁻¹⁴ cm³/cm²·s·Pa | ASTM D1434 |
Engineering Considerations in Biogas Digesters
1. Chemical Resistance
HDPE liners are non-reactive to sulfides, nitrates, and volatile fatty acids generated during digestion. They must maintain integrity despite pH fluctuations (commonly between 6.5 and 8.5).
2. Flexibility and Weldability
A 2mm liner offers sufficient thickness for field seam welding (hot wedge or extrusion welding), meeting the tight leak rate requirements under ASTM D6392.
3. Thermal Compatibility
Biogas digesters can reach up to 55°C in thermophilic systems. HDPE maintains its mechanical strength and elasticity at elevated temperatures without deformation.
4. Anchoring and Support
Liners must be supported with anchor trenches or concrete locking channels to prevent displacement due to internal gas pressure.
5. Dual Containment Systems
In large-scale digesters, a double-liner system may be used, with leak detection between two HDPE layers, increasing reliability.
Installation Guidelines
Subgrade Preparation: Remove sharp objects, compact base to 95% Proctor density, maintain slope ≥ 3:1 for stability.
Welding: Seams should be tested using vacuum box or air pressure method per ASTM D4437.
Testing: Post-installation CQA should include thickness tests, seam peel and shear tests, and spark testing (if conductive layer applied).
Covering: In floating or covered digesters, protect liners from UV exposure with soil cover or geotextile.
Regulatory and Environmental Compliance
2mm HDPE liners must meet:
GRI-GM13 Specification for HDPE geomembranes
ISO 9001/14001 for manufacturing quality and environmental practices
EPA 40 CFR Part 258.40 (for digesters near waste facilities)
EU Regulation 1069/2009 for handling animal by-products (if applicable)
All materials should be certified as non-toxic and recyclable, supporting sustainable biogas production practices.
Real-World Applications
Agricultural Digesters: Cow manure biogas lagoons in Southeast Asia.
Municipal Wastewater Plants: HDPE liners used in anaerobic sludge digesters in Europe.
Industrial Organic Waste Processing: Brewery and food processing plant digesters in North America.
Example: A 15,000 m² lagoon lined with 2mm HDPE successfully maintained methane retention and zero leakage for over 12 years under a tropical climate.
Frequently Asked Questions (FAQ)
Q1: Is a 2mm liner overkill for small digesters?
A: Not necessarily. Thicker liners reduce long-term risk, especially where puncture hazards, gas accumulation, or equipment traffic are concerns.
Q2: Can 2mm HDPE be used in floating dome systems?
A: Yes. The material can be heat-welded into air-tight, flexible floating covers for pressure retention and gas collection.
Q3: What is the lifespan of a 2mm HDPE geomembrane?
A: Under proper installation and environmental conditions, the service life exceeds 20–25 years.
Q4: Is on-site welding reliable?
A: Yes, when performed with certified technicians and verified using non-destructive testing methods as per GRI-GM19a.
Final Recommendation
For biogas digester systems requiring durability, gas-tightness, and long-term chemical resistance, the 2mm HDPE geomembrane liner stands as the industry’s most reliable containment solution.
Its robustness, ease of installation, and compliance with international engineering and environmental standards make it ideal for both agricultural and industrial applications.
Take the Next Step
If you're planning a biogas project or need assistance specifying liner requirements, contact our technical team to discuss custom sizing, delivery timelines, or compliance documentation.
We can help you navigate material selection, project specifications, and field performance strategies to ensure a long-lasting, leak-proof installation.
