This dataset represents the treatment process of leachate generated from landfill activities. The dataset is applicable to arid and semi-arid regions (long-term average annual precipitation < 400 mm). The main treatment technologies include filtration separation, centrifugal separation, sedimentation separation, neutralization, chemical precipitation, chemical coagulation, anaerobic hydrolysis, anaerobic biofilters, stabilization ponds, constructed wetlands, and land treatment methods.