Advantages of using HDPE geomembranes at the landfill

byمدير سايت



Geomembranes are water or gas impermeable polymer sheets that are highly resistant to environmental conditions such as rain and sunlight. These sheets are made of different polymers such as PVC, EPDM and various types of polyethylene. Geomembrane made of high density polyethylene (HDPE) is one of the most widely used sheets of polymer geomembrane. According to the following figure, geomembrane is divided into two groups of smooth and woven sheets with a thickness of 0.75 mm to 3 mm and 2 to 9 meters wide are marketed.

Common uses for these sheets include insulating pools, large ponds, and artificial lakes to prevent water from seeping into the ground. However, HDPE geomembranes are widely used in landfills due to their unique properties. There are five of these properties in the following:

1- Reducing the risk of leakage
One of the critical advantages of using HDPE geomembranes is the impermeability of these sheets to water. This feature is essential in the presence of chemicals and hazardous waste.
2- High stability by exposure to chemicals
Due to their thickness and chemical properties, in addition to resistance to water leakage, these sheets have high stability against corrosive chemicals. Other geomembrane sheets, on the other hand, may fail structurally against chemicals.
3- Dangerous gas barrier
Chemicals or chemically modified substances are more likely to produce hazardous gases when exposed to moisture and sunlight. The release of these gases is dangerous to human health and the environment. HDPE geomembrane sheets trap these hazardous gases due to their durability and thickness, thus reducing the possibility of air or environmental pollution.
4- Resistance to tear and puncture
Another advantage of using HDPE geomembrane sheets is their high tear and puncture resistance. This property becomes more important when these sheets are used in chemical and construction sites. The strong texture of HDPE geomembranes prevents the sheets from being torn by sharp objects such as metals.
5- Resistance to UV radiation
In most cases, the landfill is exposed to direct sunlight, and continuous sunlight causes the material to break down and be destroyed. However, the use of carbon black and its proper distribution in the composition of these sheets greatly reduces the risk of UV damage and increases the life of the sheet.