期刊
JOURNAL OF BIOSCIENCE AND BIOENGINEERING
卷 126, 期 1, 页码 78-87出版社
SOC BIOSCIENCE BIOENGINEERING JAPAN
DOI: 10.1016/j.jbiosc.2018.02.001
关键词
Penicillium chrysogenum; Parameter optimization; Bioleaching processes; Waste printed circuit boards; Transmission electron microscope
资金
- National Natural Science Foundation of China [31470230, 51320105006, 51604308]
- Fundamental Research Funds for the Central University of Central South University [2017zzts369]
- Youth Talent Foundation of Hunan Province of China [2017RS3003]
Biohydrometallurgy is generally considered as a green technology for the recycling of industrial solid waste. In this study, an indigenous fungal strain named Y5 with the ability of high-yielding organic acids was isolated and applied in bioleaching of waste printed circuit boards (PCBs). The strain Y5 was identified as Penidilium chrysogenum by morphological and molecular identification. Meanwhile, we investigated that an optimal set of culturing conditions for the fungal growth and acids secretion was 15 g/L glucose with initial pH 5.0, temperature 25 degrees C and shaking speed 120 rpm in shaken flasks culture. Moreover, three bioleaching processes such as one-step, two-step and spent medium processes were conducted to extract copper from waste PCBs. Spent medium bioleaching showed higher copper extraction percentage and it was 47% under 5%(w/v) pulp density. Transmission electron microscope (TEM) observation combining with energy dispersive analysis of X-rays (EDAX) showed that the leached metal ions did not obviously damage the hypha cells. All above results indicated that P. chrysogenum strain Y5 has the tolerance to metal ions, suggesting its potential in recycling of metals from waste PCBs in industry. (C) 2018, The Society for Biotechnology, Japan. All rights reserved.
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