One-step cleaning method for flux recovery of an ultrafiltration membrane fouled by banknote printing works wastewater

G. J. Zhang, Z. Z. Liu, L. F. Song, J. Y. Hu, S. L. Ong, W. J. Ng

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

A method was developed to clean ultrafiltration (UF) membranes fouled by banknote printing works wastewater.The cleaning agent was comprised of 0.7 wt.% NaOH, 0.8 wt.% Na2EDTA, 0.3 wt.% Turkey red oil and 98.2 wt.% de-ionized water. Membrane flux recovered adequately when the cleaning agent was circulated for 20-30 min at 1.5 m/s and 50-60°C. The membrane surfaces before and after cleaning were characterized by SEM/EDX. The spent cleaning agent was analyzed by TOC and ICP. The results showed foulants were removed from the fouled membrane by the cleaning. Pilot-scale experiments were also conducted to validate the efficiency of the cleaning method. This one-step cleaning method replaced an existing four-step cleaning method and was employed to clean OF units in banknote printing works wastewater plants.

Original languageEnglish
Pages (from-to)271-280
Number of pages10
JournalDesalination
Volume170
Issue number3
DOIs
StatePublished - Nov 5 2004

Keywords

  • Banknote printing works wastewater
  • Membrane fouling
  • Ultrafiltration (UF) cleaning method

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