Application of geosynthetics in sanitary landfill anti-seepage system

15-02-2020

Application of geosynthetics in sanitary landfill anti-seepage system

1. Landfill basic anti-seepage system

The landfill must be impervious to prevent pollution of groundwater and surface water. At the same time, groundwater should be prevented from entering the landfill. The artificial anti-seepage system shall meet the following requirements:

(1) Synthetic lining anti-seepage system should adopt composite lining anti-seepage system. The anti-seepage system in areas with poor groundwater can also adopt single-layer lining anti-seepage system. In areas with special geological and environmental requirements, the reservoir area is very high. Double-lined anti-seepage system at the bottom.

(2) The composite lining shall be laid according to the following structure:

a. The base of the composite lining structure at the bottom of the reservoir area, the groundwater diversion layer, the thickness should be greater than 30cm, the anti-seepage protective layer under the membrane, the thickness of the clay should be greater than or equal to 100cm, the permeability coefficient should not be greater than 1.0 × 10-7cm / s, HDPE Geomembrane, protective layer under the membrane, leachate diversion layer, thickness should be greater than or equal to 30cm, Geotextile layer.

B. Composite lining structure foundation of reservoir area slope. The thickness of the groundwater diversion layer should be greater than 30cm; the thickness of the anti-seepage protective layer under the membrane should be greater than 75mm; the permeability coefficient should not be greater than 1.0 × 10-7cm / s, HDPE geomembrane, the protective layer on the membrane, and the leachate diversion With buffer layer.

3 (3) The single-layer lining shall be laid according to the following structure.

A. The bottom of the reservoir area is a layered lining structure. The foundation, groundwater diversion layer, thickness is greater than 30cm, the thickness of the protective layer under the film, the thickness of the clay should be greater than 100cm, HDPE geomembrane, the protective layer of the film, the leachate diversion layer, the thickness should be greater than 30cm, the geotextile layer.

B. Single-layer lining structure of reservoir slope. Foundation, groundwater layer, the thickness should be greater than 30cm, the protective layer under the membrane, the thickness of the clay should be greater than 75cm, the permeability coefficient should not be greater than 1.0 × 10-5cm / s; HDPE geomembrane, the protective layer on the membrane, leachate diversion and buffer Floor.

(4) Under special circumstances, Geosynthetics Clay Liner can be used instead of the anti-seepage protective layer under the HDPE Geomembrane.

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