Why do waste-to-energy plants need geomembranes?

Waste incineration power plants generate large quantities of fly ash during the waste treatment process. Among the various pollutants produced by waste incineration, fly ash may contain dioxins and can be leached out by water in high concentrations of Cd (chromium), Pb (lead), Cu (copper), Zn (zinc), Cr (cadmium), Hg (mercury) and other harmful heavy metal substances and salts, which are considered to be the object of focus in the operation process of waste incineration. With the continuous launch of waste incineration projects, the challenges faced by fly ash treatment also need to be solved. At present, most of the waste incineration power plants use fly ash landfill for disposal, and geomembrane, as an effective seepage control material, is widely used in the seepage control project of fly ash landfill.

In this paper, the application of geomembrane in waste incineration fly ash landfill will be elaborated, including the selection of geomembrane, laying construction process, seepage control performance and environmental protection. Through the introduction of this paper, it aims to give readers a better understanding of the application of geomembranes in waste incineration fly ash landfill, and provide reference for related projects.

Geomembrane selection
The selection of geomembranes is critical in waste incineration fly ash landfills. According to the design requirements of the landfill and the actual situation, the following aspects need to be considered when choosing the right type of geomembrane:

1, seepage performance: geomembrane as an impermeable layer, must have excellent seepage performance, can effectively prevent the waste leachate infiltration into the groundwater. Therefore, when selecting the geomembrane, it is necessary to evaluate its anti-seepage coefficient and compressive strength.

2, durability: the service life of the landfill is very long, so the geomembrane must have good durability, able to maintain its performance in harsh environmental conditions for a long time.

3, puncture resistance: due to the waste contains a large number of sharp objects, these sharp objects may puncture the geomembrane, so the geomembrane must have good puncture resistance.

4、Anti-aging performance: landfill environmental conditions are harsh, sunlight, oxygen and other natural factors will cause aging of geomembrane, so the geomembrane must have good anti-aging properties.

According to the above requirements, the current commonly used geomembrane materials are mainly high-density polyethylene (HDPE) geomembrane, high-density polyethylene (HDPE) geomembrane has good seepage performance, durability, puncture resistance and aging resistance, to meet the use of rubbish incineration fly ash landfill requirements.

Laying construction technology
In the waste incineration fly ash landfill, geomembrane laying construction technology is also one of the key links, geomembrane laying construction technology includes the following aspects:

1, foundation treatment: before laying geomembrane need to landfill foundation treatment, remove debris, level the site, compaction, etc., to ensure that the foundation is flat, solid, no sharp objects, in line with the construction requirements.

2, geomembrane welding: in order to ensure the geomembrane impermeable performance, the need for geomembrane welding, welding needs to use hot melt extrusion welding or hot air welding and other processes, to ensure that the quality of welding meets the requirements.

3, laying method: according to the design requirements of the landfill and the actual situation, different laying methods can be used, such as horizontal laying, vertical laying and so on. In the process of laying, it is necessary to reasonably arrange the order and direction of laying to ensure that the quality of laying meets the requirements.

4, anchoring measures: in order to prevent the geomembrane from slipping and floating in the landfill process, the geomembrane needs to be anchored. Commonly used anchoring measures include setting up anchoring slots around the landfill and setting up anchoring nets at the bottom of the landfill.

5, quality inspection: after the completion of the laying construction, the need for geomembrane quality inspection, including the appearance of quality, welding quality, anchoring quality, etc., for parts that do not meet the requirements, rework or remedial treatment is required.

Through the above construction process, we can ensure that the quality of geomembrane laying in waste incineration fly ash landfill meets the design requirements and use requirements, and provide reliable protection for landfill seepage control project.

Seepage control performance and environmental protection
The anti-seepage performance of the geomembrane of the waste incineration fly ash landfill is one of the important indicators of its quality. In practical application, the geomembrane must be able to effectively prevent the infiltration of waste leachate into the groundwater, so as to avoid the pollution of groundwater. At the same time, in order to ensure the long-term effectiveness of the seepage control performance, the geomembrane needs to be tested and maintained on a regular basis.

In addition, environmental protection is also an important aspect of waste incineration fly ash landfill that cannot be ignored. In order to reduce the negative impact on the environment, a series of environmental protection measures need to be taken. For example, reasonable design of landfill structure, enhancement of waste leachate treatment, and control of landfill gas emissions. At the same time, it is also necessary to monitor and assess the environment around the landfill to detect and deal with environmental problems in a timely manner.

In conclusion, as an effective anti-seepage material, geomembrane of waste incineration fly ash landfill plays an important role in waste treatment, and through reasonable selection, construction technology and environmental protection measures, it can ensure that geomembrane's application effect meets the requirements, and it can make positive contributions to the protection of the environment and human health.

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