NH<sub>4</sub><sup>+</sup>对次生铁矿物形成及重金属去除的影响

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Abstract In this study, the influence of initial pH, Fe²⁺ concentration, molar ratio of Fe/NH₄⁺ on the Fe²⁺ bio-oxidation rate, total Fe deposition efficiency, and phases of secondary iron minerals in simulated AMD containing A. ferrooxidans was investigated. The Cr(VI) and As(Ⅲ) removal efficiency of different iron minerals were compared. The results indicated that under the concentration of NH₄⁺ was lower than that for A. ferrooxidans tolerance value, Fe²⁺ oxidation and total Fe removal through precipitation were not affected, 160, 80, and 20mmol/L of Fe²⁺could be completely oxidized by A. ferrooxidans within 72, 48, and 24h, and the average total Fe removal efficiency was 24.03%, 19.46%, and 8.13% at the end of the experiment (96h), respectively. In addition, in initial 160mmol/L Fe²⁺ system, when the molar ratio of Fe/NH₄⁺=2.0 and pH=2.6, the secondary iron mineral obtained was pure schwertmannite; when the molar ratio of Fe/NH₄⁺ ≤ 1.0 and pH ≤ 2.3, ammonium jarosite began to occur in this system. Additionally, the Cr(VI) and As(Ⅲ) removal efficiency of secondary iron minerals harvested from the Fe/NH₄⁺=2.0systems differed (pH=2.6 > pH=2.3 > pH=2.0). The data obtained from this study demostrated that the removal efficiency of toxic elements was mainly influenced by the apparent structure and specific surface area of secondary iron minerals.

Key words： NH₄⁺ A.ferrooxidans acid mine drainage secondary iron minerals heavy metals

Received: 02 November 2017

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Corresponding Authors: 宋永伟,副教授,syw1984888@sina.com E-mail: syw1984888@sina.com

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	SONG Yong-wei
	WANG He-ru
	CAO Yan-xiao
	ZHU Yi-han
	ZHOU Li-xiang

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SONG Yong-wei,WANG He-ru,CAO Yan-xiao等. Effect of NH₄⁺ on the formation of secondary iron minerals and the removal of heavy metals[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(6): 2116-2123.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I6/2116

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