Enhanced COD Reduction of Olefin Plant Spent Caustic Wastewater using Easily Recyclable Cu(BDC)/MgO Nanocomposites

Articles in Press

Document Type : Research Paper

Authors

1 Department of Gas and Petroleum, Yasouj University, Gachsaran 75918-74831, Iran

2 Department of Chemical Engineering, University of Science and Technology of Mazandaran, Behshahr, Iran

Abstract

This study explored the photocatalytic degradation process for treating industrial spent caustic wastewater, focusing on reducing chemical oxygen demand (COD). Cu(BDC)/MgO nanocomposites were synthesized using a microwave-assisted technique, serving as efficient photocatalysts. An artificial neural network (ANN) model was established to estimate COD concentrations and optimize treatment parameters, with a target of achieving a superior COD reduction. The research aimed to minimize the hydrogen peroxide to COD ratio and optimize other factors influencing COD removal. The synthesized nanocomposites were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and energy-dispersive X-ray spectroscopy (EDS) elemental mapping. Optimal parameters for achieving a 97.55% COD removal efficiency were identified as a nanocomposite dose of 1.30 g/L, an H2O2/Spent caustic wastewater ratio of 1.50 ml/L, a pH of 3.0, a treatment time of 35 min, and an aeration flow rate of 2.50 L/min. Catalyst recycling studies demonstrated the exceptional recyclability and stability of the Cu(BDC)/MgO nanocomposites, showing they could be reused as catalysts even after five treatment cycles. This highlights the potential for prolonged and sustainable use of these nanocomposites in wastewater treatment processes, effectively reducing COD levels in spent caustic effluents.

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Main Subjects

Journal of Chemical and Petroleum Engineering

Articles in Press, Accepted Manuscript
Available Online from 12 April 2026

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History

  • Receive Date: 08 March 2025
  • Revise Date: 16 February 2026
  • Accept Date: 12 April 2026

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