Leachate

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Leachate

Leachate (/ˈliːtʃeɪt/) is a liquid that has percolated through a solid and leached out some of the constituents. In the context of a landfill, leachate is the liquid that drains or 'leaches' from a landfill. It usually contains both dissolved and suspended material.

Etymology

The term "leachate" originates from the verb "to leach", derived from the Old English word "leccan", meaning to moisten and to surrender possession of property.

Formation

Leachate is formed when water percolates through waste deposited in a landfill. The water derives from rainfall and from the moisture inherent in the waste. As the water percolates through the waste, it promotes the dissolution or suspension of various compounds, forming the leachate.

Composition

The composition of leachate varies according to the age of the landfill and the type of waste that it contains. It usually contains both inorganic and organic components, including heavy metals, salts, and organic compounds.

Treatment

Leachate from landfills must be treated before it can be discharged. The treatment of leachate includes physical, chemical, and biological processes. The specific treatment required depends on the composition of the leachate and local environmental regulations.

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