Notice of RetractionDeeply Treatment of Dyeing 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.

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 characteristics of Dyeing wastewater is high in colourity, high in COD concentration, difficult in degradation, difficult in biological-treatment. Conventional biological process hardly meets environmental discharge standards that are more and more stringent. In this paper, a integraded treatment process that include MgSO₄-FeSO₄ two-stage flocculation, 03 oxidation, membrane bioreactor and Nanofiltration was studied by experiments. The results showed that COD total removal rate was 85% by MgSO₄-FeSO₄ two-stage flocculation when MgSO₄ and FeSO₄ was congtrol at 300mg/L and 250 mg/L respectively. Ozone oxidation could not further decrease COD, but obviously rise B/C from 0.22 to 0.46 within 40 min, which very benefited biological treatment, wastewate was further treated by membrane bioreactor and COD was further down to less than 60mg/L when Hydraulic Retention Time(HRT) was 6h. Finally, the COD, colourity and colourity of water treated deeply by nanofiltration were less than 20mg/L, 5 times and 50 us/cm, which completely meets the requirement of reuse for dyeing.