Abstract: The sewage treatment station project of the second phase of domestic waste incineration power generation project in the central urban area of Dalian city was designed to partially reuse the effluent and partially discharge it. Among them, the water quality of the recycled part met supplementary water quality requirements of the open circulating cooling water system in the GB/T 19923—2005 Reuse of Urban Recycling Water-Water Quality Standard for Industrial Uses, and the discharge part should comply with the first level A standard of GB 18918—2002 Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant. The main process of leachate treatment is “pretreatment + anaerobic + external MBR+ nanofiltration + reverse osmosis”, and the concentrated solution treatment adopts the process of “material film reduction+reinjection”. The overall operation of the project is good, and the effluent quality is stable and up-to-standard.

Key words: waste leachate, membrane bioreactor, reduction treatment, first level A standard