Bioleaching of heavy metals from red mud using Aspergillus niger

	Bioleaching of heavy metals from red mud using Aspergillus niger
	Yang Qu; Bin Lian; Binbin Mo; Congqiang Liu
	2013
发表期刊	Hydrometallurgy
卷号	136 期号:1 页码:71-77
摘要	Red mud (bauxite residue) is the main waste product of the alkaline extraction of alumina from bauxite with high amounts of metals. In this study, bioleaching of heavy metals from red mud by using the fungus Aspergillus niger was investigated. Bioleaching experiments were examined in batch cultures with the red mud at various pulp densities (1-5%, w/v) under various bioleaching conditions (one-step, two-step and spent medium bioleaching). It was shown that the main lixiviant excreted by A. niger was citric acid. The highest leaching ratios of most various heavy metals were achieved under spent medium leaching at 1% pulp density. The increase in red mud pulp densities resulted in a general decrease in leaching ratios under all bioleaching conditions. However, in the case of the spent medium leaching the decrease in leaching ratios was lowest. The Toxicity Characteristic Leaching Procedure (TCLP) tests showed that the leaching toxicity of the bioleaching residue was far below the levels of relevant regulations. The micromorphology of the red mud particles were changed by the fungal activity during bioleaching process.
关键词	Red Mud Bioleaching Heavy Metals Aspergillus Niger
学科领域	环境地球化学
收录类别	SCI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.gyig.ac.cn/handle/352002/5061
专题	环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
推荐引用方式 GB/T 7714	Yang Qu,Bin Lian,Binbin Mo,et al. Bioleaching of heavy metals from red mud using Aspergillus niger[J]. Hydrometallurgy,2013,136(1):71-77.
APA	Yang Qu,Bin Lian,Binbin Mo,&Congqiang Liu.(2013).Bioleaching of heavy metals from red mud using Aspergillus niger.Hydrometallurgy,136(1),71-77.
MLA	Yang Qu,et al."Bioleaching of heavy metals from red mud using Aspergillus niger".Hydrometallurgy 136.1(2013):71-77.

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