Where does leachate come from?

　　Where does leachate come from?

　　Leachate refers to a kind of organic wastewater with high concentration formed by removing the saturated water occupied by garbage and covering soil from the water contained in the garbage in the landfill, the rain and snow water and other water entering the landfill. There is also water seeping from the accumulated garbage prepared for incineration. The properties of leachate will change with the operation time of the landfill. This change is mainly affected by the stabilization process of the garbage in the landfill. The stabilization process of the landfill is usually divided into five stages, namely the initial adjustment phase, the transition phase, the acidification phase, the methane fermentation phase and the maturation phase.

　　Leachate refers to a kind of high-concentration wastewater formed by the water contained in the garbage in the landfill, the rain and snow water and other water entering the landfill, minus the saturated water holding capacity of the garbage and covering soil layer, and passing through the garbage layer and the covering soil layer. The water quality of landfill leachate is very complex, often containing high concentrations of organic matter, heavy metal salts, SS and ammonia nitrogen. Landfill leachate not only pollutes soil and surface water sources, but also pollutes groundwater. A lot of research has been done on removing CODCr from landfill leachate, and biological methods are generally used for treatment, but the treatment effect is not ideal and the operating cost is relatively high.