Oxidation of Fe2+ in simulative adsorption tail solution of leaching uranium through packed bed bioreactor by Acidithiobacillus ferrooxidans

doi:10.3969/j.issn.0438-1157.2012.11.045

CIESC Journal ›› 2012, Vol. 63 ›› Issue (11): 3688-3693.DOI: 10.3969/j.issn.0438-1157.2012.11.045

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Oxidation of Fe²⁺ in simulative adsorption tail solution of leaching uranium through packed bed bioreactor by Acidithiobacillus ferrooxidans

WANG Qingliang^1,2, YANG Yiquan², YANG Jing², CHEN Yongbo², HU Eming², ZHANG Hongcan², YU Runlan¹, QIU Guanzhou¹

1. School of Minerals Processing and Bioengineering, Central South University, Changsha 410083, Hunan, China;
2. School of Nuclear Resource and Nuclear Fuel Engineering, University of South China, Hengyang 421001, Hunan, China

Received:2012-02-10 Revised:2012-06-15 Online:2012-11-05 Published:2012-11-05
Supported by:
supported by the National Natural Science Foundation of China(51154003).

固定床生物反应器模拟溶浸采铀吸附尾液中Fe²⁺的氧化试验

王清良^1,2, 杨懿全², 杨敬², 陈勇博², 胡鄂明², 张洪灿², 余润兰¹, 邱冠周¹

1. 中南大学资源加工与生物工程学院, 湖南长沙 410083;
2. 南华大学核资源与核燃料工程学院, 湖南衡阳 421001

通讯作者: 王清良
作者简介:王清良(1969-),男,硕士,教授。
基金资助:
国家自然科学基金项目(51154003)。

Abstract

Abstract: The packed bed bioreactor was designed and set up,active carbon was selected as carrier to immobilize Acidithiobacillus ferrooxidans(A. f).The process parameters of oxidizing ferrous were investigated by simulating ferrous concentration and solution pH value in uranium mine in bioreactor.The results showed that the ferrous oxidation rate could increase 1.4 times from 0.5 g·L^-1·h^-1 to 1.2 g·L^-1·h^-1 with active carbon carrier. Iron in solution was consumed due to formation of NH₄Fe₃(SO₄)₂(OH)₆ during operation.It’s necessary to add ferrous periodically in order to keep certain iron concentration in solution and clean up NH₄Fe₃(SO₄)₂(OH)₆ in bioreactor.The optimum operation condition of bioreactor was ventilation from bottom,ferrous concentration keeping 5 g·L^-1 and solution flux keeping 1.2-1.4 L·h^-1 or ferrous concentration keeping 1 g·L^-1 and solution flux keeping 5.4 L·h^-1.

Key words: packed bed bioreactor, Acidithiobacillus ferrooxidans, oxidation, solution mining of uranium

摘要： 以活性炭作载体固定嗜酸氧化亚铁硫杆菌,构建固定床生物反应器,模拟溶浸采铀矿山吸附尾液全Fe浓度和溶液pH条件,对生物反应器氧化Fe²⁺工艺参数进行了试验研究。结果表明:活性炭作载体比无载体时生物反应器氧化Fe²⁺速率增加了1.4倍,由0.5 g·L^-1·h^-1增大至1.2 g·L^-1·h^-1;生物反应器运行过程中溶液中全Fe因生成铁钒而不断消耗,需要定期清理反应器中的铁矾和补充FeSO₄以保持溶液中全Fe浓度;生物反应器最优的操作条件是:底部通气,Fe²⁺浓度为5 g·L^-1时,溶液流量为1.2~1.4 L·h^-1;Fe²⁺浓度为1 g·L^-1时,溶液流量为5.4 L·h^-1。

关键词: 固定床生物反应器, 嗜酸氧化亚铁硫杆菌, 氧化, 溶浸采铀

CLC Number:

WANG Qingliang, YANG Yiquan, YANG Jing, CHEN Yongbo, HU Eming, ZHANG Hongcan, YU Runlan, QIU Guanzhou. Oxidation of Fe²⁺ in simulative adsorption tail solution of leaching uranium through packed bed bioreactor by Acidithiobacillus ferrooxidans[J]. CIESC Journal, 2012, 63(11): 3688-3693.

王清良, 杨懿全, 杨敬, 陈勇博, 胡鄂明, 张洪灿, 余润兰, 邱冠周. 固定床生物反应器模拟溶浸采铀吸附尾液中Fe²⁺的氧化试验[J]. 化工学报, 2012, 63(11): 3688-3693.

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Oxidation of Fe²⁺ in simulative adsorption tail solution of leaching uranium through packed bed bioreactor by Acidithiobacillus ferrooxidans

固定床生物反应器模拟溶浸采铀吸附尾液中Fe²⁺的氧化试验

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