Abstract: According to the problems of landfill leachate aging and difficult treatment after closure, the scattered pressure filtrate from the transfer station was collected and transported to the landfill for synergistic treatment by using its characteristics of high COD and low ammonia nitrogen. Taking the leachate from transfer station combined with landfill leachate in a city of Jiangsu as an example, the landfill leachate production after the closure was 250 m3/d, the pressure filtrate production from the transfer station was 100 m3/d, and the processing scale of current landfill leachate treatment station was 600 m3/d. The main treatment process is pretreatment + external MBR + NF + RO. NF and RO concentrate are evaporated after reduction, and the equipment and facilities of the existing landfill leachate are calculated according to the water quality and quantity of the mixture. According to the calculation, the existing buildings and equipment only need to be partially opened, and the rest can be used as standby or part of the equipment to reduce the daily operation time to meet the treatment of the mixed liquid and meet the standard. According to the calculation, the operating cost of the leachate co-processing section of “pretreatment + external MBR + NF + RO + concentrate reduction” is 93.53 yuan/m3, the operation cost of the evaporation section of the concentrated liquid is 365.27 yuan/m3. Compared with the decentralized treatment process, the synergistic treatment process can save the cost of 1.967 4 million yuan per year. The overall operation of the collaborative treatment system is good, and the effluent quality is stable and up to standard, which achieves the goal of intensive layout and energy saving.

Key words: transfer station pressure filtrate, landfill leachate, aging, carbon source, concentrated liquid evaporation, running cost