Notice of RetractionComparing of Flotation and Sedimentation Process for Treating Trihalomethanes

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 treatment of prechloridized water by the coagulation-dissolved air flotation process and the coagulation-sedimentation process was examined, the removal of trihalomethanes (THMs) and trihalomethanes formation potential (THMFP) were studied. The results show that the removal rate of THM and THMFP treated with flotation process is 37% and 55% respectively, which is respectively 18% and 21% higher than with sedimentation process (19% and 34%); After flotation process, the value of UV₂₅₄/TOC is decreased significantly, which indicates that the THMFP is decreased significantly, and the formation of THMs during the follow-up chlorination process can be reduced obviously; the removal of THMFP in each molecular weight range treated with flotation is better than with sedimentation, those two processes mainly remove the THMFP of larger molecular weight range and the removal efficiency of THMFP in smaller molecular weight range is poor.