Notice of RetractionThe Performance of Anoxic-Biostyr® (BAF) after Backwashing during a Filter Run

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.

The performance of the anoxic-Biostyr^® biological aerated filter (A-BAF) and the headloss development of BAF after backwashing during a filter run were investigated by a bench-scale experiment. The results showed that the headloss of BAF generally increased in the operation time, and reached the maximum level at 84 h. There was no significant change in the effluent COD during the operation time, the average COD concentration of A-BAF effluent was about 34.7 mg/L, and the removal of SCOD took place mainly at the lower part of the BAF reactor. The removal rate of BAF decreased a little, and the NH₄⁺-N of the effluent increased gradually from 0.5 mg/L to 2 mg/L. The effluent SS concentration was often blew 10 mg/L, except at the beginning of the filter run.