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Efficient Cu removal from CuEDTA complex-containing wastewater using electrochemically controlled sacrificial iron

Vinh Ya1, Natacha Martin2, Yi-Hsuan Chou2

  • 1Department of Water Resources and Environmental Engineering, Tamkang University, 151 Yingzhuan Road Tamsui District, New Taipei City, 25137, Taiwan; Faculty of Chemistry and Environment, Dalat University, Dalat, Viet Nam.

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This study introduces an electro-replacement/precipitation/deposition/direct reduction (ERPDD) process using scrap iron to remove copper from wastewater. The ERPDD method achieved complete copper removal and significantly reduced operational costs compared to traditional methods.

Keywords:
Copper removalDirect reductionElectro-depositionElectro-replacementScrap iron

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Area of Science:

  • Environmental Chemistry
  • Electrochemistry
  • Wastewater Treatment

Background:

  • Copper ethylenediaminetetraacetic acid (CuEDTA) complexes are persistent pollutants in wastewater.
  • Conventional chemical treatment methods for CuEDTA are often costly and less effective.

Purpose of the Study:

  • To investigate the efficacy of an electro-replacement/precipitation/deposition/direct reduction (ERPDD) process for removing copper from CuEDTA complexes in wastewater.
  • To compare the ERPDD process with chemical replacement/precipitation (CRP) and evaluate its cost-effectiveness.

Main Methods:

  • Utilized scrap iron in a Ti mesh cage as a sacrificial anode in an ERPDD system.
  • Conducted experiments with varying electrical current densities and controlled dissolved oxygen (DO) levels.
  • Verified removal mechanisms using iron or carbon anodes in solutions with and without EDTA.

Main Results:

  • Complete copper removal from CuEDTA complexes was achieved under applied electrical current density (1.18-2.36 mA/cm²).
  • Dissolved oxygen negatively impacted copper removal; complete removal occurred with negligible DO under N₂ purging.
  • The ERPDD process demonstrated significant cost savings (60-75%) compared to CRP.

Conclusions:

  • The ERPDD process is a highly effective and cost-efficient method for treating wastewater containing CuEDTA complexes.
  • Electrochemical control and optimized conditions (low DO) are crucial for maximizing copper removal efficiency.
  • This technology offers a sustainable alternative to conventional wastewater treatment methods for chelated metals.