Garbage leachate refers to a high-concentration wastewater formed by the water contained in the garbage itself in the landfill, the rain and snow water entering the landfill, and other water, minus the saturated water holding capacity of the garbage and the covering soil layer, and passing through the garbage layer and the covering soil layer.

Leachate is a high-concentration organic wastewater with complex components, high pollutant concentration, high chroma, and strong toxicity. It is a recognized problem in the current water treatment industry. It not only contains a large amount of organic pollutants, but also contains various heavy metal pollutants. If the garbage is not properly handled, it will not only affect the quality of surface water, but also endanger the safety of groundwater.