Notice of RetractionInfluence of C/N Ratio on Nitrogen Removal in Sequencing Batch Biofilm Reactor

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.

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The laboratory-scale fiber thread carrier sequencing batch biofilm reactor (SBBR) was developed to treat municipal wastewater with different C/N ratios. The influence of C/N ratios on nitrogen removal was evaluated under different conditions of T_temperature=(25±1)°C, V_aeration=150 L/h, t_operation=15 d, 20 d, 20 d. When the C/N ratios are 10.0, 5.0, 3.3, the average removal rates of COD were 87.2%, 92.3% and 94.3% those of NH₃-N were 99.3% 99.7% and 78.1% and those of TN were 92.9% 67.3% and 48.2% respectively. The C/N ratios had little effect on the NH₃-N removal, while they had greater effect on the removal of TN. When the C/N ratio was low, the removal efficiency of nitrogen decreased. In the SBBR, simultaneous nitrification and denitrification (SND) occurred throughout the study. Moreover, the level of denitrification creased with the C/N ratio creasing.