Notice of RetractionChemical Optimization in the Co-Precipitation Phosphorus Removal Process

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.

For short of carbon resource used for denitrification and phosphorus removal, poor biological phosphorous removal is achieved in lower concentration municipal wastewater treatment plants. Chemical addition should be taken into account in these occasions in order to meet the discharge requirement. In this study, 5 different chemicals was added to the co-precipitation treatment process in order to optimize chemical species,namely FeCl₃·6H₂O, FeSO₄·7H₂O, AlCl₃·6H₂O, PAC and PSF. The results showed that ferrous-based chemicals had higher phosphorus removal efficiencies than that of aluminium based chemicals, and ferrous sulfate had the highest phosphorous removal efficiency. The optimal ferrous sulfate dosage is 1.2:1 (molar ratio Fe/TP), and at this chemical dosage more than 85% soluble total phosphorus (DTP) removal efficiency is achived. In addition, while ferrous sulfate dosing ratio was lower than 1.6:1(molar ratio Fe/TP), Fe/TP had significantly positive correlation with TP and PO₄^3- in the effluent.