1. Bottom anti-seepage of landfill site. Effective anti-seepage measures are taken at the bottom of the landfill site to prevent groundwater pollution caused by leachate from household waste treatment projects. Previously, the bottom of landfills was covered with a layer of anti-seepage material, mainly synthetic rubber such as clay, asphalt, plastic film, etc. In recent years, foreign countries have begun to use artificial synthetic anti-seepage layers, some of which use double anti-seepage layers, with significantly better results than the former.
2. Collection and treatment of leachate. Due to its complex composition and high pollution, leachate must be treated before discharge. However, there is currently no comprehensive treatment process at home and abroad that can adapt to various types of leachate from garbage. Generally speaking, leachate can be treated by the method of "separating clean water from sewage, reinjection of leachate, pretreatment, and merging with urban sewage treatment plants". The recycling and utilization of landfill gas. Landfill gas (also known as biogas) is a recyclable energy source with a calorific value similar to that of city gas. However, due to the complexity of landfill gas recovery equipment, high investment and low efficiency, most of the operating landfills in China currently do not have gas recovery systems. A large amount of toxic and harmful gases are released into the air, which not only causes pollution but also a waste of resources. Generally speaking, biogas recycling and utilization can be carried out through the method of "collection purification utilization".
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