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OPTIMIZATION OF COPPER RECOVERY FROM WEEE BY BIO-METALLURGICAL PROCESS

  • Angel Sneha John - School of Biosciences and Technology, Vellore Institute of Technology, India
  • Kalaichelvan Gurumurthy - VIT School of Agricultural Innovations and Advanced Learning, Vellore Institute of Technology, India

DOI 10.31025/2611-4135/2025.19463

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Copyright: © 2023 CISA Publisher

Abstract

Bioleaching of metals from Waste Printed Circuit Board (WPCB) is an alternative path for metal mining. Metallic composition of processed PCB at different size were estimated in this study. Acidithiobacillus ferrooxidans was used as a biomining agent to recover copper. Recovery of copper using this organism can be affected with several factors like pH, temperature, pulp density, sample quantity, sample size, inoculum load etc., It is pertinent to screen and optimize the influencing variables to maximize recovery. Four factors viz. particle size, temperature, FeSO4 concentration and sample quantity were screened using Plackett-Burmann design. The process variables, temperature, FeSO4 concentration and sample quantity were optimized using Box-Behnken design at 30ºc temperature, 40.08 g/L FeSO4 concentration and sample quantity of 5 g/L with a recovery rate of 80.56%. Using the optimized values, the influence of inoculum load and treatment duration were assessed. Inoculum of 50 ml/L and treatment period of 20 days produced a recovery rate of copper of 86.9%. Redox potential curve and pH variation of the bioleaching system also supports the findings of optimization as well as enhancement.

Keywords

Editorial History

  • Received: 23 Sep 2023
  • Revised: 10 Nov 2024
  • Accepted: 18 Nov 2024
  • Available online: 11 Jan 2025

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