The most commonly used landfill sealants for control of gas and leachate movement is:

Concept-

Landfills are areas carefully designed and placed in or on top of the ground. Their main purpose being waste disposal, it is crucial that the waste does not get the chance to contaminate the surrounding soil, or more importantly, the groundwater.

Therefore, the use of landfill sealants has become a necessity. Several types of sealants can be used in different parts of landfills.

Even when solid waste is disposed of in a landfill, there is always contaminated liquid going to the bottom of the landfill. This calls for special landfill sealants or soil sealant systems. The liquid is called leachate and it appears as a combination of different kinds of chemicals.

The leachate is directed into pipelines which take it to leachate collection tanks or ponds nearby.

Bentonite and illites are most commonly used as land fill sealants for the control of gas and leachate movement.