"Hao" product - geomembrane for oxidation ponds

Oxidation Pond Geomembrane

Development of Innovative Products

Disadvantages of Conventional Geomembranes

Resistance to Environmental Stress Cracking

The resin used in HDPE membranes has a density range of 0.935-0.940 g/cm³ and is highly crystalline. The resin used in LLDPE membranes has a density range of 0.919-0.925 g/cm³ and is less crystalline. For landfill cover materials, resistance to environmental stress cracking is a critical property.

Uneven Settlement

Uneven settlement of landfill waste after closure can form localized depressions. The landfill material undergoes significant deformation as the terrain changes. If the deformation capacity of the landfill material is limited, stress increases, leading to stress cracking.

Membrane Bulging and Stress Concentration

Gas accumulation beneath the membrane creates localized bulges, causing stretching, deformation, and even rupture.

High-Pressure Biogas Impact and Fatigue Damage

Fluctuations in biogas pressure (typically 5-10 kPa) cause the membrane to repeatedly expand and contract, making welds susceptible to fatigue cracking.

Characteristics of geomembrane for oxidation ponds

Excellent Performance

In landfill closure applications, LLDPE film offers the same excellent performance as HDPE film (high tensile strength, high water vapor barrier properties, and high methane gas barrier properties), meeting the requirements of landfill closure technical specifications.

High Multiaxial Elongation

In landfill closure applications, the uneven settling of landfill waste and the methane gas generated during waste degradation place higher demands on the multiaxial elongation of the closure film. LLDPE film offers greater flexibility and higher multiaxial elongation than HDPE film. HDPE's multiaxial elongation is approximately 15%, while LLDPE's can reach over 30%.