Dye removal from textile dye wastewater using recycled alum sludge

Wei Chu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

240 Citations (Scopus)


The removal of dyes from textile dying wastewater by recycled alum sludge (RAS) generated by the coagulation process itself was studied and optimized. One hydrophobic and one hydrophilic dye were used as probes to examine the performance of this process. It was found that RAS is a good way of removing hydrophobic dye in wastewater, while simultaneously reducing the fresh alum dosage, of which one third of the fresh alum can be saved. The back-diffusion of residued dye from the recycling sludge is detected but is easily controlled as long as a small amount of fresh alum is added to the system. The use of RAS is not recommended for the removal of hydrophilic dyes, since the high solubility characteristics of such dyes can cause deterioration in the water quality during recycling.
Original languageEnglish
Pages (from-to)3147-3152
Number of pages6
JournalWater Research
Issue number13
Publication statusPublished - 31 Jul 2001


  • Alum
  • Dye
  • Hydrophilic
  • Hydrophobic
  • Recycle
  • Sludge

ASJC Scopus subject areas

  • Earth-Surface Processes


Dive into the research topics of 'Dye removal from textile dye wastewater using recycled alum sludge'. Together they form a unique fingerprint.

Cite this