Notice of RetractionResearch on Treatment of Harbor Oily Wastewater by Coagulation-Sedimentation 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.

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In this study, coagulation-sedimentation process was adopted to treat harbor oily wastewater. Single-factor experiments showed that the optimum parameters were dosage of poly-aluminum chloride (PAC) of 150 mg L^-1 and polyaerylamide (PAM) of 2.5 mg L^-1; pH of 7.5. The mixture was stirred vigorously for 1 min at the rotational speed of 300 r min^-1, then stirred for 10 min at 100 r min^-1, and 10 min at 50 r min^-1, then settled for 30 min. Under these conditions, COD concentration was reduced from 481~510 mg L^-1 to around 200 mg L^-1, oil content from 21~36 mg L^-1 to 10~15 mg L^-1, and SS from 153~197 mg L^-1 to 21~34 mg L^-1. Meanwhile, it was observed a linear relationship between removals of suspended solid (SS) and oil content, indicating the oil pollutant was mainly absorbed on the suspended solid.