Guia passo a passo para instalação do revestimento do digestor de biogás (Geomembrana HDPE)

Proper installation of a biogas digester liner is critical to ensure long-term gas tightness, chemical resistance, and system safety. This step-by-step guide shows how installers place Revestimentos de geomembrana de PEAD in anaerobic digesters, gas storage ponds, and leachate lagoons to achieve airtight containment and environmental protection.

Step 1 — Subgrade Preparation (Foundation Work)

Before installing the liner, the installation team must properly prepare the subgrade.

Requirements:

• Remove sharp stones, roots, and debris
• Compact soil to create a stable, smooth surface
• Ensure slope design for drainage
• Moisture content should be controlled

Install a nonwoven geotextile cushion layer above the soil to prevent puncture.

Step 2 — Liner Deployment and Positioning

HDPE geomembrane rolls are carefully unrolled across the prepared surface.

Key points:

• Avoid dragging the liner across rough surfaces
• Allow thermal expansion space
• Align sheets according to welding direction
• Install during low wind conditions

Panels should overlap 10–15 cm for welding.

Step 3 — Hot Wedge Welding of Seams

Seam welding determines gas tightness.

Technicians use automatic hot-wedge welding machines to form double-track welds with an integrated air channel for testing.

Critical controls:

• Temperature: 220–350°C depending on thickness
• Speed: consistent machine travel speed
• Pressure: uniform pressure on seams

Step 4 — Air Pressure Testing of Welds

Each welded seam must be tested.

Air channel test method:

1. Seal both ends of the weld channel
2. Inject air pressure (200–300 kPa)
3. Monitor pressure drop for 5 minutes

No pressure loss = qualified weld.

As a result, this step ensures both gas-tightness and liquid impermeability.

Step 5 — Detail Treatment Around Pipes and Corners

Take special care around:

• Inlet/outlet pipes
• Corners and wall connections
• Concrete interfaces

Installers use extrusion welding to seal complex shapes, details, and penetrations.

Step 6 — Protection Layer Installation

After welding and testing:

• Install protective geotextile layer above liner (if required)
• Add soil or ballast layer where needed
• Prevent direct UV exposure before commissioning

Step 7 — Final Inspection and Commissioning

Before the system starts operation：

• Visual inspection of entire liner surface
• Check all weld logs and test records
• Confirm anchoring trench fixation

Common Installation Mistakes to Avoid

Why HDPE Is Ideal for Biogas Digester Liners

HDPE geomembrane provides:

• Excellent resistance to organic acids and H₂S
• Extremely low gas permeability
• Long service life (30+ years)
• Reliable welding performance
• Flexibility for settlement

Aplicações típicas

• Usinas de biogás agrícola
• Digestores de esterco de gado
• Instalações de resíduos orgânicos municipais
• Industrial anaerobic digestion systems

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Contact our engineering department para:

• Amostras grátis de testes laboratoriais
• Consultoria técnica específica do projeto
• Revisão da metodologia de instalação
• Análise de custo-benefício em comparação com as soluções tradicionais de impermeabilização