The possibility fo using nanofiltration as treatment method for waste water in the textile industry was investigated. AN effluent form a textile factory ,after bilogical treatment and sand filtration, was taken as feed solution for a lab-scale nanofiltratin unit. The retentio of organic and inorganic ocmpounds was tested for three nanofiltration membranes: NF70, Nittio NTR 7450 and UTC-20. As expected, considerable differences in retention were observed. The highest retentions were obtained for NF70. For UTC-20 and Nitto 7450, retentions were slightly lower. COlour removal was nearly complete for hte three membranes. Depending on the choice of the membrane, the permeate can meet the quality standards for process waters imposed by textile factories nd reused as process water. IF the permeate is recycled, a considerable amount of water can be saved. The experimental rsults were also used to obtain information about the memebranes. COnclusions were made on the shape of the retnetion curves of the different membranes as a function of molecular size.
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