Objective To analyze the effects of ozone-bidogical activated carbon(O₃-BAC) advanced water treatment process to remove ammonia nitrogen and oxygen consumed in source water and to provide scientific basis for the government to develop better water supply plan and promote the use of the advanced water treatment process.

Methods Based on the standard test method for drinking water (GB/T 5750-2006), the source water and finished water samples from a waterworks in Shanghai were collected each year in 2011-2016, and the indexes of ammonia nitrogen and oxygen consumed were measured. The removal rate of ammonia nitrogen and the reducing of oxygen consumed in water samples before and after using O₃-BAC advanced water treatment process in a water plant was compared by t-test; the qualified rate of ammonia nitrogen and oxygen consumed in water before and after O₃-BAC advanced water treatment process was compared by χ² test.

Results The removal rate of ammonia nitrogen from source water was 35.78%±33.45% and that of oxygen consumed was 36.47%±17.97% by using conventional water treatment process; while the removal rate of ammonia nitrogen from source water was 65.78%±17.37% and that of oxygen consumed was 53.75%±16.72% by using O₃-BAC advanced water treatment process. The differences were statistically significant (P < 0.01). The qualified rate of ammonia nitrogen and oxygen consumed in treated water was 37.5% and 25.0% respectively by using conventional water treatment process; while the qualified rate of both ammonia nitrogen and oxygen consumed in treated water was 100% by using O₃-BAC advanced water treatment process. The difference was statistically significant (P < 0.05).

Conclusions The effect of O₃-BAC advanced water treatment process on the removal of ammonia nitrogen and oxygen consumed in source water was remarkable, which could effectively increase the qualified rate of treated water. It is important to improve the quality of drinking water.