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Kitchen wastewater degradation using electrochemical reactor.

V S Neeraj1, Shyam Sumant1, Karthikeyan Muthukumar2

  • 1Department of Chemical Engineering, National Institute of Technology, Tiruchirappalli, India.

Environmental Technology
|July 4, 2025
PubMed
Summary

This study treats kitchen wastewater using an e-waste derived electrode in an electrochemical reactor, achieving significant chemical oxygen demand (COD) reduction. Optimized conditions yielded 84% COD removal with high electrode stability.

Keywords:
Electrochemical oxidationPbO2 electrodebipolar reactore-wastekitchen wastewater

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Area of Science:

  • Environmental Science
  • Electrochemistry
  • Materials Science

Background:

  • Kitchen wastewater (KW) presents a significant global challenge due to its bio-refractory organic content.
  • Effective treatment methods are crucial for managing KW and mitigating environmental pollution.

Purpose of the Study:

  • To investigate the electrochemical treatment of KW using novel e-waste derived electrodes.
  • To optimize operating parameters for enhanced chemical oxygen demand (COD) removal efficiency.

Main Methods:

  • Utilized an electrochemical bipolar disk stack reactor with lead dioxide (PbO2)-coated graphite electrodes derived from electronic waste.
  • Employed response surface methodology (RSM) with a central composite design (CCD) to study operating parameters.
  • Developed a theoretical model to predict COD removal efficiency.

Main Results:

  • COD removal efficiency was significantly influenced by applied voltage, electrolyte concentration, and flow rate.
  • Optimized conditions (12 V, 5 g/L NaCl, 0.25 mL/s) achieved 84% COD reduction.
  • Demonstrated superior catalytic activity and stability of the e-waste-derived electrode with low energy consumption (0.0134 kWh/g COD).

Conclusions:

  • Electrochemical treatment using e-waste derived electrodes is a viable and efficient method for KW treatment.
  • The developed electrode material exhibits excellent catalytic properties and long-term stability.
  • Optimized operating parameters and theoretical modeling enhance the practical application of this technology.