Geomembrane

• 1. Extremely low permeability: This is the core characteristic of geomembranes, effectively blocking various fluids, including water, water vapor, chemical solutions, and methane.
• 2. Chemical resistance: It exhibits excellent corrosion resistance to acids, alkalis, salts, oils, and various organic solvents, making it suitable for a variety of complex environments.
• 3. Aging resistance: By adding additives such as carbon black and antioxidants, it resists UV radiation and oxidation, extending its service life in exposed environments.
• 4. Excellent mechanical properties: It possesses high tensile strength, tear strength, and puncture resistance, enabling it to withstand certain ground deformations and external loads.
• 5. Convenient installation: It is lightweight and can be processed into larger rolls for easy transportation and on-site installation. The sheets can be welded together to form a complete, airtight barrier.

Geomembranes are used extensively, encompassing nearly every engineering application requiring anti-seepage, isolation, and containment. Their primary applications include:

1. Environmental Engineering

This is the most important and largest application area for geomembranes.

• Solid waste landfills: Used in landfill bottom lining and top cover systems to prevent harmful leachate from contaminating the soil and water below and to capture landfill gas. This is a hallmark application of HDPE geomembranes.
• Hazardous waste disposal sites: These sites have higher requirements for anti-seepage protection and typically employ a double-lining system to ensure complete containment of toxic and hazardous materials.
• Sewage treatment plants: Used in sewage regulating ponds, sedimentation tanks, anaerobic ponds, and other areas for anti-seepage protection, preventing wastewater leakage.
• Industrial tailings ponds: Tailings slurry generated after mineral processing in mines contains pollutants such as heavy metals. Using geomembrane liners can prevent contamination of the surrounding environment.

2. Water Conservancy Projects

• Artificial Lakes and Landscape Water Bodies: Seepage control measures are implemented on the bottoms and slopes of artificial water features such as parks, residential areas, and golf courses to maintain water levels.
• Reservoirs and Canals: Seepage control measures are used for the construction or renovation of reservoirs and irrigation canals to improve water resource utilization efficiency.
• Levees and Cofferdams: Serves as anti-seepage core walls or inclined walls to reduce seepage through the dam body and ensure project safety.
• Flood Control Projects: Seepage control measures are used for temporary flood control dikes.

3. Municipal and Construction Projects

• Underground Structure Waterproofing: Waterproofing of basements, tunnels, and subway structures, such as basements and side walls, in combination with traditional waterproofing materials.
• Roof Garden Waterproofing: Serves as a subgrade waterproofing barrier for green roofs.
• Drainage Ditches: Prevents canal water from seeping into the ground and affecting surrounding structures.

4. Mining Projects

• Heap Leaching Tanks: In the hydrometallurgical smelting of metals such as gold, silver, and copper, geomembranes are used to line heap leaching tanks to collect precious metal solutions and prevent loss and contamination.
• Solution Sedimentation Tanks: Used for the storage and sedimentation of various solutions in mining, metallurgy, and chemical processes.

5. Agriculture and Aquaculture

• Aquaculture Ponds: Provide slope protection and bottom waterproofing for aquaculture ponds for fish, shrimp, sea cucumbers, and other species, facilitating cleaning and water quality management.
• Irrigation Reservoirs: Reduce water loss during storage in arid regions due to seepage.

6. Transportation Engineering

• Highway and Railway Roadbeds: In soft soil treatment, these tanks are sometimes used as an isolation and anti-seepage layer to prevent mud and mud from forming on the roadbed.