The treatment of leachate from urban landfills has always been a very challenging issue in the design, operation, and management of landfills. Leachate is the product of liquid gravity flow in landfills, mainly derived from precipitation and the water content of the garbage itself. Due to many factors that may affect the properties of leachate during the flow of liquids, including physical, chemical, and biological factors, the properties of leachate vary within a considerable range. Generally speaking, its pH value is between 4 and 9, COD is within the range of 2000 to 62000mg/L, BOD5 is between 60 and 45000mg/L, and the concentration of heavy metals is basically the same as that in municipal sewage. Leachate from urban landfill sites is a highly concentrated organic wastewater with complex components. If not treated and directly discharged into the environment, it can cause serious environmental pollution. It is essential to treat leachate for the purpose of protecting the environment.

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