Abstract: To address the increasingly severe challenges in landfill leachate treatment, particularly the surge in leachate during the rainy season, and to ensure the stable operation of the environmental park and ecological safety, Shenzhen Xiaping Environmental Park initiated a new leachate treatment capacity expansion and retrofitting project. This project was designed to process 1 200 m3/d of leachate, adopting a combined process of equalization tank + two-stage A/O-MBR(membrane bio-reactor)+ nanofiltration + reverse osmosis. The volume reduction + submerged combustion evaporation technology was utilized for concentrate treatment, achieving full quantitative treatment and significantly alleviating environmental pressure on the park. During implementation, challenges such as odor in evaporation tail gas and membrane equipment clogging (impacting treatment efficiency) were addressed through optimized process design and equipment configuration upgrades. A refined tail gas treatment process was combustion in evaporators + alkali scrubbing spray towers + temperature elevation + bag dust removal + botanical liquid spray，and process of coagulation sedimentation + filtration system was introduced before nanofiltration concentrate enters the volume reduction system to effectively remove macromolecular organics， ensure membrane system stability and mitigate odor issues. The successful execution of this project not only provides robust support for the sustainable development of waste disposal in the park， but also contributes valuable experience to the advancement of landfill leachate treatment technologies in China.

Key words: leachate, aging, complete quantitative treatment, membrane fouling, evaporation exhaust gases