期刊
WASTE MANAGEMENT
卷 60, 期 -, 页码 397-406出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2016.07.025
关键词
Municipal Solid Waste Incinerator fly ash; Sulphuric acid leaching; Bioleaching; S and Fe-oxidizing bacteria; Metal removal; Critical elements
资金
- SPINNER consortium
- Giovanni Gabbianelli (University of Bologna)
- VTT Technical Research Centre of Finland
- MarcoPolo programme
- RFO-Unibo
Bio- and hydrometallurgical experimental setups at 2-1 reactor scale for the processing of fly ash from municipal waste incinerators were explored. We aimed to compare chemical H2SO4 leaching and bioleaching; the latter involved the use of H2SO4 and a mixed culture of acidophilic bacteria. The leaching yields of several elements, including some of those considered as critical (Mg, Co, Ce, Cr, Ga, Nb, Nd, Sb and Sm), are provided. At the end of the experiments, both leaching methods resulted in comparable yields for Mg and Zn (>90%), Al and Mn (>85%),Cr(similar to 65%), Ga (,similar to 60%), and Ce (similar to 50%). Chemical leaching showed the best yields for Cu (95%), Fe (91%), and Ni (93%), whereas bioleaching was effective for Nd (76%), Pb (59%), and Co (55%). The two leaching methods generated solids of different quality with respect to the original material as we removed and significantly reduced the metals amounts, and enriched solutions where metals can be recovered for example as mixed salts for further treatment. Compared to chemical leaching the bioleaching halved the use of H2SO4, i.e., a part of agent costs, as a likely consequence of bio-produced acid and improved metal solubility. (C) 2016 Elsevier Ltd. All rights reserved.
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