期刊
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
卷 18, 期 4, 页码 742-751出版社
SPRINGER
DOI: 10.1007/s10163-015-0375-x
关键词
Bioleaching efficiency; Printed circuit boards (PCBs); Ferrous ion (Fe2+); Dissolved oxygen (DO); Copper; Acidithiobacillus ferrooxidans
资金
- science and technology department in Jiangsu province [BK20131133]
- program of applied and basic research [CY20120020]
- science and technology of social development in Changzhou city [CE20145050]
Acidithiobacillus ferrooxidans, as chemolithotrophic aerobic bacterium, can obtain energy by oxidation of ferrous ions (Fe2+) to ferric ions (Fe3+) and use molecular oxygen (O-2) as terminal electron acceptor. In this study, the effects of dissolved oxygen (DO) levels in culture medium on cell growth and copper extraction from waste printed circuit boards (PCBs) were investigated in A. ferrooxidans. The whole culture period was divided into two stages of cell growth and copper extraction. At the former stage, relatively lower DO level was adopted to satisfy bacterial growth while avoiding excessive Fe2+ oxidation. At the later stage, higher DO was used to promote copper extraction. Moreover, shift time of DO from lower to higher level was determined via simulating Gauss function. By controlling DO at 10 % for initial 64 h and switching to 20 % afterwards and with 18 g/l PCBs addition at 64 h, final copper recovery reached 94.1 %, increased by 37.6 and 48.3 % compared to constant DO of 10 and 20 % operations. More importantly, copper leaching periods were shortened from 108 to 60 h. It was suggested that application of DO-shifted strategy to enhancing copper extraction from PCBs with reduced leaching periods is being feasible.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据