Notice of RetractionOptimization of coagulation-flocculation conditions for the treatment of combined sewer overflow wastewater

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.

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The coagulation-flocculation process was used at laboratory bench scale for the removal of chemical oxygen demand (COD), and Turbidity in CSO wastewater. Aluminium Sulphate, Ferric chloride, Polyaluminium Chloride (PAC) and Polyferric sulfate (PFS) were employed in the coagulation flocculation process. Polyaluminium Chloride (PAC) proved most effective on the removal efficiency of COD and Turbidity, comparing the four coagulants employed in this work. The removal efficiency of the COD and Turbidity from CSO wastewater increased at first and decreased at certain dosage of PAC. The optimum dosage is 100, 200mg/L respectively. Taguchi method was employed to optimize the mixing and settling conditions. The optimum process conditions for the treatment of CSO wastewater were chosen as Rapid mixing speed=250rpm, Rapid mixing time =1min, slow mixing speed =50rpm, slow mixing time =20min, Settling time=20min.