Landfill leachate

What is landfill leachate?

When rainwater is deposited on the ground it comes into contact with landfill waste, which is sometimes decomposed, and therefore collects polluting residues and substances. Therefore, a liquid that is initially harmless becomes waste that requires treatment. This effluent, called landfill leachate, can be treated on site or fed to special treatment plants. In Italy, the preference is to use specific plants to treat leachate.

Treatment of landfill leachate and environmental factors

Leachate production is mainly affected by the meteorological situation in the area around the landfill (rainfall, temperature and wind) and the characteristics of the waste dumped at the landfill (humidity and degree of compaction).


Importance of building a plant that is suited to the landfill

The factors that give rise to landfill leachate can be divided into controllable factors (water infiltration from outside) and non-controllable factors (the part produced by waste degradation processes). Studying the iteration of these two factors and ongoing analysis of the wastewater are essential in order to monitor the results of the treatment cycle.


Plants for landfills

Characteristics of a leachate treatment plant

The qualitative characteristics of the leachate vary over time owing to the chemical reactions that are triggered by the landfill, therefore flexibility is important. When treating landfill leachate, there must be a special focus on COD, ammonia and metals.

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