his project is located in Bengbu City, Anhui Province. The treatment object is leachate from the garbage treatment plant. The treatment scale is 300m3/d. It adopts the "pretreatment + primary A/O + secondary A/O + external tubular membrane + RO" treatment process. The treated tail water is used for road washing and greening in the factory area. The designed inlet water quality COD: 10000mg/L, BOD: 5000mg/L, SS: 2000mg/L, ammonia nitrogen: 2100mg/L; the treated effluent reaches the standard of Table 2 of GB16889-2008, and the concentrated liquid is recharged to the treatment site.