Notice of RetractionThe Effect of pH on Ammonian Removal in SBR System

Notice of Retraction

After careful and considered review of the content of this paper by a duly constituted expert committee, this paper has been found to be in violation of IEEE´s Publication Principles.

We hereby retract the content of this paper. Reasonable effort should be made to remove all past references to this paper.

The presenting author of this paper has the option to appeal this decision by contacting TPII@ieee.org.

SBR, in which nitrification and denitrification processes took place in one tank, was an ideal process for ammonia nitrogen treatment. In this paper, the influence of pH as an important factor on SBR was studied in order to provide some help for the practical engineering. Firstly, the effect of pH on the nitrification process was studied, the results showed that ammonia removal rate was more than 85% when pH was 7.9 and 8.3, the concentration of nitrite and nitrate reached equilibrium at pH of 7.9, while at pH of 8.3 accumulation of nitrite occurred. Ammonia removal efficiency only was 50%, both nitrite concentration and nitrate concentration were very low when pH was 6.5. Secondly, the effect of pH on the denitrification process was studied, the results indicated that the removal rate of nitrogen oxide increased at first and then decreased with the pH increased, the maximum rate was 79% occurred at pH of 7.0.