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Electrochemical coagulation for textile effluent decolorization.

Chen-Lu Yang1, Jared McGarrahan

  • 1University of Massachusetts-Dartmouth, Advanced Technology and Manufacturing Center, Fall River, USA. cyang@umassd.edu

Journal of Hazardous Materials
|August 23, 2005
PubMed
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This study demonstrates electrochemical coagulation effectively removes over 98% of common textile dyes like reactive, acid, and disperse dyes. Process efficiency is significantly influenced by sodium chloride concentration, voltage, current density, and pH.

Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies
  • Textile Dye Chemistry

Background:

  • Textile industry widely uses reactive, acid, and disperse dyes.
  • Anthraquinone and azo dye structures are prevalent.
  • Effective and efficient dye removal methods are crucial for environmental protection.

Purpose of the Study:

  • To investigate the feasibility of electrochemical coagulation for removing common textile dyes.
  • To evaluate the removal efficiency of C.I. Reactive Blue-19, C.I. Acid Red-266, and C.I. Disperse Yellow-218.
  • To understand the influence of operational parameters on dye removal.

Main Methods:

  • Dye color intensity measured using a Hach spectrophotometer (absorbance).
  • Aluminum and ferric coagulants generated electrochemically.

Related Experiment Videos

  • Removal efficiencies determined by absorbance measurements at specific wavelengths (592 nm, 498 nm, 428 nm).
  • Laboratory-scale electrochemical reactor used for coagulant generation and dye treatment.

    • Main Results:

    • Achieved over 98% removal efficiency for the studied dyes under laboratory conditions.
    • Dye removal efficiency was highly dependent on NaCl concentration, applied voltage, current density, and pH.
    • Sodium chloride addition reduced power consumption and enhanced coagulant generation.

    Conclusions:

    • Electrochemical coagulation is a highly effective method for removing common textile dyes.
    • Optimizing parameters like NaCl concentration, voltage, current density, and pH is key for efficient dye removal.
    • The study proposed a mechanism for the liquid-phase chemistry involved in the process.