LANDFILL LINERS

A landfill liner or composite landfill liner, is intended to be a low permeable barrier, which is laid down under engineered landfill sites.

DEFINITION

to isolate the landfill contents from the environment

to protect ground water from pollution

to protect soil from contamination

NEED OF LANDFILL LINERS

VARIOUS TYPES OF LINERS

CLAY GEO-MEMBRANE HIGH DESITY POLYTHENE (HDPE) GEONET GEOTEXTILE

To protect the ground water from landfill contaminants, clay liner are constructed as a simple liner that is two to five feet thick.

CLAY

Natural clay is often fractured and cracked. A mechanism called diffusion will move organic chemicals like benzene through a three feet thick clay landfill liner in approximately five years. Some chemicals can degrade clay.

SOME DEMERITS OF USING CLAY AS LINER

These liners are constructed from various plastic materials, including polyvinyl chloride(PVC). This material is strong resistant to most chemicals, considered to be impermeable to water.

GEO-MEMBRANE

High Density Polythene is a hydrocarbon polymer prepared from ethylene/petroleum by a catalytic process.

HIGH DENSITY POLYTHENE(HDPE)

Geonet is plastic net like drainage blanket used in landfill liner in place of sand or gravel for leachate collection.

GEONET

Geotextiles are permeable fabrics which, when used in association with soil, have the ability to separate, filter, reinforce, protect or drain.The geotextile layer is used to minimize the intermixing of the soil and soil or gravel.

GEOTEXTILE

SINGLE LINER SYSTEM

COMPOSITE LINER SYSTEM

DOUBLE LINER SYSTEM

TYPES OF LINER SYSTEM

Single liners (Box-1)consist of a clay liner, geo-synthetic clay liner or geo-membrane liner.

SINGLE LINER SYSTEM

Composite liner system consist of a geo-membrane in combination with a clay liner(Box-2).It is more effective at limiting leachate migration into subsoil than either a clay liner or a single geo membrane layer.

COMPOSITE LINER SYSTEM

Double liner consists of either two single liners, two composite liners, or a single and a composite liner (Box-3).The upper(primary) liner usually function to collect the leachate, while the lower(secondary) liner acts as leak-detection system and backup to the primary liner.

DOUBLE LINER SYSTEMS

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