Notice of RetractionEnhanced Chemical Coagulation for Coking Wastewater from Effluent A/O Bio-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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Enhance chemical coagulation for coking wastewater was employed as advanced treatment method for A/O biological effluent in this paper. Factors such as solution pH and coagulant dosage that influence the process of coagulation were experimentally tested. The index of A/O biological treatment of coking wastewater was: COD_Cr value was 367mg/L, Turbidity was 44 UNT and Chroma was 75. Results showed that during pH value 4~10 range and the same dosage of coagulation process, turbidity, chroma and COD_Cr removal rate of A/O biological effluent of coking wastewater were the best when pH = 6. The optimum dosage coagulant is 10mg/L when the pH = 6, this dosage is the best for removal rate of chroma, turbidity and COD_Cr. The removal rate of chroma, turbidity and COD_Cr is respectively 66.67%, 50% and 68%.The A/O biological effluent of coking wastewater meets the national emission standards finally.