阴离子对<em>Acidithiobacillus ferrooxidans</em>氧化活性及次生铁矿物形成影响

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Abstract

Acid mine drainage (AMD) is characterized typically by high acidity, soluble Fe, sulfate, and toxic metals. Thus, it is of practical significance to promote the transformation of soluble Fe and sulfate into secondary iron hydroxysulfate minerals by biomineralization of A. ferrooxidans, which is helpful in enhancing subsequent lime neutralization efficiency of AMD due to reducing the production of ferric hydroxide and waste gypsum. In the study, we investigated that the influence of three anions (Cl^-、NO₃^-、PO₄^3-) on the pH value, bio-oxidation rate of Fe²⁺, total Fe deposition efficiency, and phases of secondary iron minerals in simulated AMD containing A. ferrooxidans. The results indicated that a higher concentration of monovalent cations inhibited the biological oxidation of Fe²⁺. The tolerance ability of A. ferrooxidans to the three anions varied significantly (PO₄^3- > NO₃^- > Cl^-). In addition, for anion concentrations lower than those tolerated by A. ferrooxidans, Fe²⁺ oxidation was not affected. However, high concentration of anion can inhibited the hydrolysis and mineralization of Fe³⁺ indirectly by inhibiting the oxidation activity of A. ferrooxidans, resulting in a decrease in the total Fe precipitation rate and a reduction in the secondary iron minerals production. Influenced by the decrease of Fe³⁺ supply rate, the synthetic pathway of secondary iron minerals was biased towards the schwertmannite.

Key words： A. ferrooxidans anions biological oxidation activity secondary iron minerals

Received: 28 June 2017

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	Articles by authors
	SONG Yong-wei
	CHEN Ting
	WANG He-ru
	YANG Jun
	CAO Yan-xiao
	ZHOU Li-xiang

Cite this article:

SONG Yong-wei,CHEN Ting,WANG He-ru等. Effect of anions on the oxidation activity of Acidithiobacillus ferrooxidans and the formation of secondary iron minerals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(2): 574-580.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I2/574

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