{"title":"Utilization of industrial by-products as nutrients for gold bioleaching from waste random access memory.","authors":"Ngoc Tu Trinh Tran, Duy Tho Tran, Thi Phuong Thuy Pham, Yeoung-Sang Yun","doi":"10.1016/j.biortech.2025.132938","DOIUrl":null,"url":null,"abstract":"<p><p>Gold (Au) recovery from waste random access memory (WRAM) was successfully achieved through a bioleaching process utilizing Chromobacterium violaceum. In this study, condensed distiller solubles (CDS), a by-product of industrial ethanol fermentation, was used to stimulate cyanide production, thereby enhancing Au dissolution. Prior to bioleaching, selective removal of base metals was conducted using 100 mM Fe<sub>2</sub> (SO<sub>4</sub>)<sub>3</sub>, achieving 99.7 % copper removal without impacting Au content and effectively minimizing competition for cyanide ions. Subsequently, the treated material was used for the Au bioleaching. Bioleaching parameters, including pulp density, CDS concentration, glycine dosage, and pH, were optimized. The highest Au leaching efficiency of 98.6 % was achieved at WRAM pulp density of 10 g/L, CDS concentration of 8 %, glycine concentration of 3 g/L, and pH of 7.0. This integrated strategy, combining selective chemical pretreatment with CDS-enhanced bioleaching, presents a simple, cost-effective, and environmentally sustainable method for efficient Au recovery from electronic waste.</p>","PeriodicalId":258,"journal":{"name":"Bioresource Technology","volume":" ","pages":"132938"},"PeriodicalIF":9.7000,"publicationDate":"2025-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Bioresource Technology","FirstCategoryId":"5","ListUrlMain":"https://doi.org/10.1016/j.biortech.2025.132938","RegionNum":1,"RegionCategory":"环境科学与生态学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"AGRICULTURAL ENGINEERING","Score":null,"Total":0}
引用次数: 0
Abstract
Gold (Au) recovery from waste random access memory (WRAM) was successfully achieved through a bioleaching process utilizing Chromobacterium violaceum. In this study, condensed distiller solubles (CDS), a by-product of industrial ethanol fermentation, was used to stimulate cyanide production, thereby enhancing Au dissolution. Prior to bioleaching, selective removal of base metals was conducted using 100 mM Fe2 (SO4)3, achieving 99.7 % copper removal without impacting Au content and effectively minimizing competition for cyanide ions. Subsequently, the treated material was used for the Au bioleaching. Bioleaching parameters, including pulp density, CDS concentration, glycine dosage, and pH, were optimized. The highest Au leaching efficiency of 98.6 % was achieved at WRAM pulp density of 10 g/L, CDS concentration of 8 %, glycine concentration of 3 g/L, and pH of 7.0. This integrated strategy, combining selective chemical pretreatment with CDS-enhanced bioleaching, presents a simple, cost-effective, and environmentally sustainable method for efficient Au recovery from electronic waste.
期刊介绍:
Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies.
Topics include:
• Biofuels: liquid and gaseous biofuels production, modeling and economics
• Bioprocesses and bioproducts: biocatalysis and fermentations
• Biomass and feedstocks utilization: bioconversion of agro-industrial residues
• Environmental protection: biological waste treatment
• Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.