Can the composite drainage network directly contact with landfill leachate

In landfills, the treatment and discharge of leachate is very important. Composite drainage network is a drainage material commonly used in landfills. So, can it be in direct contact with landfill leachate?

1. Basic characteristics of composite drainage network

The composite drainage net is made of high-density polyethylene ( HDPE） It is made of such polymer materials, has a three-dimensional structure, and a plurality of drainage channels are formed inside. Therefore, it has extremely high drainage properties and can collect and discharge moisture from soil or landfill sites. It also has good chemistry Stability, acid and alkali corrosion resistance and aging resistance, and can remain stable for a long time under harsh environmental conditions.

2. Characteristics and challenges of landfill leachate

Landfill leachate is a liquid with complex composition and high concentration of pollutants. It may contain various harmful substances such as heavy metals, organic matter, and ammonia nitrogen. These substances are not only potentially harmful to the environment, but they can also have a corrosive or destructive effect on the materials it comes into contact with. So, in When selecting materials that come into contact with landfill leachate, fully consider its corrosion resistance and stability.

3. Contact problems between composite drainage network and landfill leachate

1、The polymer material used in the composite drainage network has good chemical corrosion resistance and can resist the erosion of landfill leachate to a certain extent. However, this does not mean that the composite drainage network can have unlimited direct contact with landfill leachate.

2、Certain components in landfill leachate may have long-term effects on the performance of composite drainage networks. For example, high concentrations of organic matter or ammonia nitrogen may accelerate the aging process of composite drainage networks and reduce its service life. If there is damage or joint treatment in the composite drainage net Under improper circumstances, landfill leachate may penetrate into soil or groundwater through these loopholes, causing environmental pollution.

4. Measures

In practical applications, in order to ensure the effectiveness and safety of composite drainage networks, the following measures can be taken:

1、Choose the right material: According to the composition and characteristics of landfill leachate, choose a composite drainage net with higher corrosion resistance and stability.

2、Strengthen protective measures: In the area where the composite drainage network is in contact with landfill leachate, a protective layer or isolation layer can be installed to reduce the direct erosion of the composite drainage network by leachate.

3、Regular inspection and maintenance: Regularly inspect and maintain the composite drainage network, and promptly discover and deal with potential damage or aging problems.

4、Optimize the design of the drainage system: By optimizing the design of the drainage system, the residence time of landfill leachate in the composite drainage network is reduced, and its erosion on materials is reduced.