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Integrated copper-containing wastewater treatment using xanthate process.

Yi-Kuo Chang1, Juu-En Chang, Tzong-Tzeng Lin

  • 1Department of Environmental Engineering, National Cheng Kung University, 1 Ta-Hsueh Road, Tainan 701, Taiwan, ROC.

Journal of Hazardous Materials
|July 27, 2002
PubMed
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The xanthate process effectively removes copper from wastewater, creating a stable sludge that meets hazardous waste regulations. This method offers a comprehensive solution for treating copper contamination and managing disposal requirements.

Area of Science:

  • Environmental Chemistry
  • Water Treatment Technologies

Background:

  • Heavy metal contamination in wastewater poses significant environmental risks.
  • Conventional treatment methods often generate hazardous sludge requiring specialized disposal.
  • The xanthate process is recognized for heavy metal removal but sludge management remains a concern.

Purpose of the Study:

  • To evaluate the efficacy of potassium ethyl xanthate (KEX) in removing copper ions from wastewater.
  • To assess the leaching potential and stability of the resulting copper xanthate (Cu-EX) complexes.
  • To determine if the Cu-EX sludge meets Taiwan EPA waste disposal requirements.

Main Methods:

  • Utilized potassium ethyl xanthate (KEX) for copper ion removal from synthetic wastewater.
  • Applied Toxicity Characteristic Leaching Procedure (TCLP) to assess sludge leachability.

Related Experiment Videos

  • Employed Semi-Dynamic Leaching Test (SDLT) to evaluate metal stabilization under acidic conditions.

    • Main Results:

    • KEX effectively reduced copper concentrations to below Taiwan EPA effluent regulations (3 mg/l) across various initial concentrations.
    • TCLP results indicated that Cu-EX complexes meet current regulations, classifying them as non-hazardous.
    • SDLT demonstrated excellent metal stabilization properties of Cu-EX complexes, even under acidic conditions.

    Conclusions:

    • The xanthate process using KEX is a viable and comprehensive strategy for treating copper-contaminated wastewater.
    • The resulting Cu-EX sludge can be managed as non-hazardous waste, simplifying disposal.
    • This process addresses both effluent quality and sludge management challenges effectively.