Optimization of Precious Metals Recovery from Electronic Waste by Chromobacterium violaceum Using Response Surface Methodology (RSM)

Wan Nur Fazlina Abdol Jani; Fatihah Suja'; Sharifah Iziuna Sayed Jamaludin; Nor Fadilah Mohamad; Noor Hidayu Abdul Rani

doi:10.1155/2023/4011670

Optimization of Precious Metals Recovery from Electronic Waste by Chromobacterium violaceum Using Response Surface Methodology (RSM)

Bioinorg Chem Appl. 2023 Mar 30:2023:4011670. doi: 10.1155/2023/4011670. eCollection 2023.

Authors

Wan Nur Fazlina Abdol Jani¹, Fatihah Suja'², Sharifah Iziuna Sayed Jamaludin¹, Nor Fadilah Mohamad¹, Noor Hidayu Abdul Rani¹

Affiliations

¹ School of Chemical Engineering, College of Engineering, Universiti Teknologi MARA Johor Branch, Pasir Gudang Campus, 81750 Bandar Seri Alam, Masai, Johor, Malaysia.
² Department of Civil & Structural Engineering, Faculty of Engineering & Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

Abstract

An effective recovery technology will be valuable in the future because the concentration of the precious metal contained in the source can be a key driver in recycling technology. This study aims to use response surface methodology (RSM) through Minitab software to discover the optimum oxygen level (mgL^-1), e-waste pulp density (% w/v), and glycine concentration (mgL^-1) for the maximum recovery of gold (Au) and silver (Ag). The method of precious metals recovery used for this study was taken from the bioleaching using 2 L of batch stirred tank reactor (BSTR). A Box-Behnken of RSM experimental statistical designs was used to optimize the experimental procedure. The result of the RSM optimization showed that the highest recovery was achieved at an oxygen concentration of 0.56 mgL^-1, a pulp density of 1.95%, and a glycine concentration of 2.49 mgL^-1, which resulted in the recovery of 62.40% of Au. The pulp density and glycine concentration greatly impact how much Au is bioleached by C. violaceum. As a result, not all of the variables analyzed seem crucial for getting the best precious metals recovery, and some adjustments may be useful in the future.