Microfiltration/ultrafiltration as pretreatment for reclamation of rinsing waters of indigo dyeing

Uzal N., YILMAZ L., YETİŞ Ü.

DESALINATION, vol.240, pp.198-208, 2009 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 240
  • Publication Date: 2009
  • Doi Number: 10.1016/j.desal.2007.10.092
  • Journal Name: DESALINATION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.198-208
  • Keywords: Textile wastewater, Microfiltration, Ultrafiltration, Indigo dyeing, WASTE-WATER, MANUFACTURING-INDUSTRY, TEXTILE-INDUSTRY, UF MEMBRANES, ULTRAFILTRATION, NANOFILTRATION, EFFLUENTS, REUSE, TECHNOLOGIES, REMOVAL
  • Middle East Technical University Affiliated: Yes

Abstract

This paper focuses Oil the applicability of microfiltration (MF)/ultrafiltration (UF) as a pretreatment to nanofiltration (NF) for the reclamation of rinsing waters of indigo dyeing process. Two different MF alternatives, single 5 mu m MF and sequential 5 mu m + 0.45 mu m MF, were evaluated as prefiltration to improve the performance of the proceeding UF stage. UF tests performed after 5 pin MF Using 100 kDa, 50 kDa, 20 kDa, 2 kDa and 1 kDa membranes have indicated that all the UF membranes provided the same cumulative color retention of 98-99%. However, in terms of COD retention, UF membranes presented different performances and the highest retentions were by both 50 kDa (56%) and 100 kDa (59%) membranes. As regards permeation rate, 100 kDa and 50 kDa UF membranes appeared to have the highest flux decline chic to fouling. When sequential MF (5 mu m + 0.45 mu m) was adopted to decrease this fouling, 0.45 mu m MF before UF was found not to provide any significant improvement. Thus. single stage 5 mu m MF followed by 100 kDa UF was selected as the best prefiltration train to NF that permits the textile producer to reclaim indigo dyeing wastewater.