Abstract: Three leachate treatment facilities were equipped in a domestic wastelandfillin North China. The processes were regulating reservoir + anaerobic reactor + two stage nitrification and denitrification + ultrafiltration + nanofiltration + reverse osmosis, regulating reservoir + two stage nitrification and denitrification + ultrafiltration + high pressure reverse osmosis + reverse osmosis and regulating reservoir+pretreatment rotating biologicalcontactor + nitrification, and denitrification + ultrafiltration + high pressure reverse osmosis. By comparing the operation data, it was found that the three leachate treatment facilities all had good removal effects on the main pollutants under different water quality. The average removal rates of COD, ammonia nitrogen and total nitrogen were above 99.0%, and the electrical conductivity of the facility decreased by more than 95.0%. Comprehensively considering the factors such as energy consumption, operating costs and treatment effect, the process of MBR+high pressure reverse osmosis+reverso osmosis had better effect than the process of MBR+nanofiltration + reverse osmosis in the treatment of aged leachate.

Key words: leachate, two-stage nitrification and denitrification, rotating biological disc, total nitrogen