Abstract: With the accelerated urbanization process in China, the remediation of existing informal landfills has become an imminent task. In-situ excavation and sorting disposal technology offered a dual advantage of releasing land resources and permanently eliminating potential sources of pollution, making it widely applied in practical engineering projects. Conventional sorting disposal technologies often had limitations such as a single sorting system, frequent clogging during the process, poor sorting quality, and low efficiency and capacity. A landfill was taken as an example, and the characteristics of aged waste at the landfill was considered, a refined sorting process was proposed, which could effectively reduce the impurity content of the sorted product and the frequency of clogging during the sorting process, thereby improving the sorting efficiency and capacity. At the same time, the existing issues of current sorting disposal technologies were analyzed, and prospects were discussed, so as to provide reference for landfill site sorting and disposal models.

Key words: landfill, aged refuse, high-precision sorting, tertiary sorting