纳滤膜深度处理棉针织品印染废水

采用芳香聚酰胺膜(NF-1#)、复合膜(NF-2#)和聚酰胺复合膜(NF-3#)深度处理棉针织品印染废水，考察了膜分离性能及膜污染情况的影响因素。实验结果表明，在操作压力为0.5MPa、废水温度为25~35℃、废水pH为7的条件下，NF-1#膜处理效果最佳，COD去除率最高，为76.0%~85.0%;脱盐率也最高，达90.0%。膜过滤后浓水送污水厂处理，产水回用于车间生产。操作压力增高、废水温度升高和废水pH增大均导致滤饼层阻力(Rc)和膜过滤过程中的总阻力(Rt)增加，Rc是Rt的主要组成部分，同时也是导致膜透过通量下降的主要因素。

Advanced Treatment of Cotton Knit Goods Dyeing Wastewater by Nanofiltration Membrane

Aromatic polyamide membrane (NF-1#),composite membrane (NF-2#) and polyamide composite membrane (NF-3#) were used in the advanced treatment of cotton knit goods dyeing wastewater. The factors affecting the separation performance and fouling of the membranes were studied. The experimental results show that under the optimum process conditions of operation pressure 0.5 MPa,wastewater temperature 25-30℃ and wastewater pH 7,the treatment effect on membrane NF-1# is the best with 76.0%-85.0% of COD removal rate and 90.0% of desalinization rate. After nanofiltration,the concentrated water is transferred into sewage treatment plant,while the product water is reused for cotton knit goods production. With the increasing of operation pressure,wastewater temperature and wastewater pH,the cake resistance (Rc) and the total resistance (Rt) of membrane are both increased. Rc is the main component of Rt,and is the main factor causing the decline of membrane permeation flux.