Abstract: Based on the leachate quality index, leachate treatment and derivative depth treatment system operation practice of a municipal solid waste incineration plant in the southern city from 2019 to 2023， the key parameters and control requirements for the stable operation of leachate and concentrate treatment system were analyzed and summarized. The leachate treatment adopted the process of “anaerobic（UASB）+ denitrification + nitrification + ultrafiltration (UF) + first-stage pipe network reverse osmosis (STRO) + second-stage reverse osmosis (RO)”, the concentrate treatment process was “two-stage oxidation + two-stage flocculation and sedimentation + three-stage evaporation + mother liquid reinjection”. The practice indicated that the volumetric load（calculated by COD）of UASB process was 5-10 kg/(m3·d), the sludge concentration was about 8 000 mg/L, COD∶N∶P was （350-500）∶5∶1, and the hydraulic retention time was 7-15 d. The hydraulic retention time ratio of nitrification and denitrification in primary A/O was controlled at 3∶2, the reflux ratio of nitrification solution was about 300%-1 000%, the sludge concentration was 20 g/L, and the sludge age was about 30 d. After further advanced treatment by UF, STRO and RO, the effluent could be recycled after reaching the standard.

Key words: municipal solid waste incineration plant, leachate, full quantitative treatment, concentrated solution evaporation