A city's ability to properly manage industrial and household waste without causing secondary pollution is often a fundamental indicator of its level of civilization. In recent years, significant funding has been allocated to the construction of landfills, and cities have prioritized landfill construction and renovation as key infrastructure projects to improve public welfare.

However, sanitary landfills in China still face the "Three Highs and One Low" technical challenges. The "Three Highs" refer to high leachate concentration, high leachate water levels, and high settlement failure risks. The "One Low" refers to the low stability and safety factor of sanitary landfills. Additionally, there is often a mismatch between the design and construction of geosynthetic materials used in sanitary landfills.

Moving forward, it is essential to develop and optimize the application of geomembranes based on the characteristics of China's sanitary landfills. Further development is also needed in geomembrane liner leakage detection and other related monitoring technologies. Standardization and regulatory improvements for geosynthetics in landfill construction are crucial, making the upgrading of HDPE geomembrane landfill liner technology an urgent necessity.

HDPE Geomembrane for Landfill Liner Systems

The landfill leachate containment system utilizes an HDPE geomembrane liner to ensure proper rainwater and wastewater separation. The application of HDPE geomembranes in landfill construction has become increasingly important in modern environmental protection. Currently, high-density polyethylene (HDPE) geomembranes are widely used for landfill leakage prevention.

Common HDPE geomembrane specifications for landfill applications include 1.5mm geomembrane, 2.0mm geomembrane, and 0.35mm geomembrane, among others. Other available options include 1.0mm HDPE geomembrane, 1.5mm geomembrane construction plans, and 2.0mm anti-seepage geomembrane, offering cost-effective and anti-aging properties.

Additionally, geotextile reinforcement layers are used alongside geomembranes, such as woven slit-film geotextiles, 400g/m² geotextiles, 800g/m² nonwoven geotextiles, 900g/m² geotextiles, and 1000g/m² geotextiles. The GB/T 17643-1998 standard was later revised in 2011 to QB/T 17643-2011, reflecting improvements in polyethylene geomembrane performance based on long-term usage data.

Currently, HDPE geomembranes have been widely adopted across multiple sectors, including:

• Municipal solid waste landfill liners
• Hazardous waste landfill barriers
• Wastewater treatment plant liners
• Artificial lake waterproofing geomembranes
• Tailings dam seepage control

HDPE geomembrane, also known as high-density polyethylene geomembrane, is manufactured using medium to high-density polyethylene resin, offering excellent environmental stress crack resistance, low-temperature resistance, aging resistance, and chemical resistance. With an operating temperature range of -60°C to +60°C and a service life of up to 70 years, HDPE geomembranes are a key material in landfill seepage control, wastewater treatment, and environmental containment projects.

By integrating geomembrane liners into landfill design, cities can improve waste containment efficiency, enhance groundwater protection, and meet modern environmental protection standards.