Abstract: According to the characteristics of sewage reverse osmosis concentrated water, the high efficiency biological nitrogen removal tank, ABR reaction tank and high density sedimentation tank are selected. Engineering practice indicates that the process has achieved effective removal of ammonia nitrogen, total nitrogen, COD and phosphorus by controlling the amount of carbon source dosing and DO in the high-efficiency biological denitrification tank, ABR reaction tank DO, and the amount of pharmaceutical dosing in the high-density sedimentation tank under the action of nitrification, denitrifying bacteria, special species and flocculants. And the effluent meets the special limit discharge requirements of Water Pollutant Discharge Standards for Heilonggang and Yundong River Basins. And the process has certain impact resistance load. It can adapt to the change of the raw water quality and the effluent quality remains stable. It’s worthwhile to popularize this process with low operation cost, operation safety and so forth.

Key words: RO, concentrated water, design, ABR reaction tank