| Owing to high colored, high COD, high salt load and lowbiodegradability, the dying effluents become difficult to treat in bothdomestic and overseas. In recent years, how to treat the textile wastewaterand recycle water in a more effective way has been always an importantitem of investigation by domestic and overseas experts. Amoung variouswastewater treatment technologies, membrane technology is beingconcerned because of the low energy consuming, high efficiency, nosecondary pollution.This paper aims to provide the references for the application andselection of membrane in advanced dying wastewater treatment.Microfiltration(MF), ultrafiltration(UF)and nanofiltration(NF)membranes with different materials were used to treat dying wastewater.The performance of these membranes in treating dying wastewater wasanalyzed including the removal of color, COD, ion and turbidity, etc. At thesame time, membrane fouling in the wastewater treatment was alsoinvestigated, and membrane regeneration experiments were carried out. The results showed that MF membranes held good performance in removalof turbidity. The removal rate of N6 MF membrane was higher than that ofCN-CA. UF membranes which were suitable for the removal of organicmaters with large moleculer, had middle efficiency of removing COD. Itwas found that CTA UF membrane had the highest removal rate of COD upto 52.41% among the six UF membranes with different materials.Compared with MF and UF membranes, NF membrane showed thesuperiority in advanced dyeing wastewater treatment not only because ofits high rejection for color, ions and organic matters, but also due to its highquality of permeate which can meet the requirement of water reutilization.Further more, the membrane regeneration experiment showed that therecovery rate of membrane flux can be up to 82.16% by 25-30 min pipelineflushing, which indicated the wide application prospects of membranetechnology in dyeing wastewater treatment. |
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