Novel strategies of bioleaching metals from printed circuit boards (PCBs) in mixed cultivation of two acidophiles

被引：118

作者：

Liang, Guobin ^{[1
]}

Mo, Yiwei ^{[2
]}

Zhou, Quanfa ^{[1
]}

机构：

[1] Jiangsu Teachers Univ Technol, Sch Chem & Environm Engn, Changzhou 213001, Peoples R China

[2] Chinese Acad Trop Agr Sci, S Subtrop Crop Res Inst, Zhanjiang 524091, Peoples R China

来源：

ENZYME AND MICROBIAL TECHNOLOGY | 2010年 / 47卷 / 07期

关键词：

Bioleaching; Printed circuit boards (PCBs); Metals; Acidithiobacillus thiooxidans; Acidithiobacillus ferrooxidans; THIOBACILLUS-FERROOXIDANS; ELECTRONIC SCRAP; WASTE; RECOVERY; COPPER; SOLUBILIZATION; REMOVAL;

D O I：

10.1016/j.enzmictec.2010.08.002

中图分类号：

Q81 [生物工程学（生物技术）]; Q93 [微生物学];

学科分类号：

071005 ; 0836 ; 090102 ; 100705 ;

摘要：

Effects of two acidophiles on metals recovery in printed circuit boards (PCBs) were investigated. Based on the phenomenon that PCBs addition times and amounts adversely inhibited bacterial growth and thus lowered metals bioleaching capacity, novel strategies of multiple PCBs additions (4 g/l at 48 h, 6 g/l at 96 h and 8 g/l at 144 h) were developed in separated culture of Acidithiobacillus thiooxidans and Acidithiobacillus ferrooxidans. As a result, percentages of Cu, Ni, Zn and Pb leached by A. thiooxidans were 78, 73, 75 and 71%, and corresponding values were 80, 73, 76 and 72% by A. ferrooxidans after 240 h cultivation. Further applying the strategies to mixed culture of two acidophiles, extraction percentages of Cu, Ni, Zn and Pb were 94, 89, 90 and 86%, respectively. Moreover, increased redox potential and lowered pH in filtrate were observed, suggesting the mechanism involved in enhancing metals recovery in mixed culture. (C) 2010 Elsevier Inc. All rights reserved.

引用

页码：322 / 326

页数：5

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