Value-Addition to Paper Waste

Waghmode, Meghmala; Gunjal, Aparna

doi:10.1007/978-981-16-4921-9_280-1

Cited by 1 publication

(1 citation statement)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Indigenous processes, such as pyrometallurgy and hydrometallurgy, have been previously used to recover metals from e-waste, but the use of these methods has been disadvantageous due to their severe environmental impact and the production of secondary pollutants, such as brominated and chlorinated di-benzo furans and dioxins, and higher energy inputs and chemical reagent consumption [2,3,7,8]. Bio-hydrometallurgy has gained tremendous attention from researchers as a prominent process to recover metals from e-waste because this process has been deemed to be ecofriendly, has a lower operational cost, and requires lower energy inputs [9]. To date, two different bioleaching approaches have been employed, i.e., direct and indirect approaches (one-step and two-step) [10].…”

Section: Introductionmentioning

confidence: 99%

Two-Step Bio-Dissolution of Metals from Printed Circuit Boards Using Acidophilic Iron- and Sulfur-Oxidizing Mesophiles

Magoda,

Nomngongo,

Mekuto

2024

Recycling

View full text Add to dashboard Cite

To date, electronic waste (e-waste) is the fastest-growing waste stream worldwide due to technological advancement and the advent of the Fourth Industrial Revolution. Although e-waste is an environmental hazard, these materials are considered good secondary sources of metals. This study examined the bioleaching of metals from printed circuit boards, where a two-step bioleaching approach was used with iron–sulfur-oxidizing microorganisms at different e-waste particle sizes. The metal analysis from the different particle sizes (PSs) showed that copper (Cu), tin (Sn), and lead (Pb) were predominantly deposited in the coarser fraction, ranging from 500 to 710 µm at 28.7, 20.5, and 11.1 wt.%, respectively. On the other hand, metals such as iron (Fe), zinc (Zn), manganese (Mn), nickel (Ni), and aluminum (Al) were mostly deposited in the finer fraction, which ranged from 38 to 150 µm at 37.3, 5.9, 8.8, 1.3, and 4.2 wt.%, respectively. After the bioleaching process, it was observed that higher metal extraction occurred at a PS ranging from 38 to 150 µm, which achieved recovery efficiency rates of 62.9%, 68.2%, 95.3%, 86.1%, 61.9%, 47.2%, 21.2%, and 63.6% for Al, Cu, Fe, Mn, Ni, Pb, Sn, and Zn, respectively, over 10 days.

show abstract