title: Immobilization of Acidithiobacillus ferrooxidans on Cotton Gauze for the Bioleaching of Waste Printed Circuit Boards.
abstract: The bioleaching parameters of metal concentrates from waste printed circuit boards by Acidithiobacillus ferrooxidans immobilized on cotton gauze in a two-step reactor were investigated in this study. The results indicated that an average ferrous iron oxidation rate of 0.54 g/(L·h) and a ferrous iron oxidation ratio of 96.90 % were obtained after 12 h at aeration rate of 1 L/min in bio-oxidation reactor. After 96 h, the highest leaching efficiency of copper reached 91.68 % under the conditions of the content of the metal powder 12 g/L, the retention time 6 h, and the aeration rate 1 L/min. The bioleaching efficiency of copper could be above 91.12 % under repeated continuous batch operation. Meanwhile, 95.32 % of zinc, 90.32 % of magnesium, 86.31 % of aluminum, and 59.07 % of nickel were extracted after 96 h. All the findings suggested that the recovery of metal concentrates from waste printed circuit boards via immobilization of A. ferrooxidans on cotton gauze was feasible.
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Hongyan
authors.initials: H
authors.lastname: Nie
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China. nwzhu@scut.edu.cn.|The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, China. nwzhu@scut.edu.cn.|The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, 510006, China. nwzhu@scut.edu.cn.
authors.forename: Nengwu
authors.initials: N
authors.lastname: Zhu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Yanlan
authors.initials: Y
authors.lastname: Cao
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.
authors.forename: Zhiguo
authors.initials: Z
authors.lastname: Xu
authors.affiliation: School of Environment and Energy, South China University of Technology, Guangzhou, 510006, China.|The Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou, 510006, China.|The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou, 510006, China.
authors.forename: Pingxiao
authors.initials: P
authors.lastname: Wu
mesh_terms: D042763:Acidithiobacillus / Q000166:cytology* / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D018914:Cells, Immobilized / Q000378:metabolism; D032561:Cotton Fiber; D055615:Electrical Equipment and Supplies; D008670:Metals / Q000302:isolation & purification / Q000378:metabolism; D010084:Oxidation-Reduction; D011327:Printing; D014866:Waste Products
chemical_list: D008670:Metals; D014866:Waste Products
keywords: A. ferrooxidans; Bioleaching; Cotton gauze; Immobilization; Waste printed circuit boards