Abstract:To explore the technical feasibility of the closure of a valley-type informal waste dump site, this paper proposes a technical plan for ecological closure based on the environmental risk status of a valley-type informal waste dump site, combined with the engineering geological and hydrogeological conditions of the site. Vertical seepage interception + blocking dam + pile reinforcement and shaping + leachate landfill gas collection and drainage + site closure and coverage system + ecological restoration system + monitoring system” engineering measures. The project implementation results show that: 1) After the implementation, the characteristic factors such as groundwater ammonia nitrogen, total phosphorus, chemical oxygen demand, and heavy metal manganese do not exceed the standard, and the pollution risk to the surrounding environment has been effectively controlled; 2) The ecological restoration effect of the garbage dump is better, landscape garden design is carried out on the top platform, and the slope surface adopts shallow root vegetation type, and the overall coverage reaches more than 95%, and the regional environment has been greatly improved; 3) Through ecological closure of informal garbage dumps, garbage disposal comprehensive comparison of treatment technologies such as screening for resource utilization, aerobic accelerated stabilization, and remote relocation. In the case of good site geological conditions and no surrounding environmentally sensitive points, it is recommended to adopt ecological closure technology to control informal waste dumps. , can achieve an ideal governance effect, and the successful implementation of this project provides a reference for the governance of informal waste landfills in my country.