耐冷嗜酸硫杆菌快速氧化地浸采铀吸附尾液中Fe2+

doi:10.16085/j.issn.1000-6613.2017-2356

化工进展 ›› 2018, Vol. 37 ›› Issue (10): 3995-4005.DOI: 10.16085/j.issn.1000-6613.2017-2356

耐冷嗜酸硫杆菌快速氧化地浸采铀吸附尾液中Fe²⁺

王清良^1,2, 陈鹏¹, 胡鄂明¹, 李乾¹, 王红强³, 阳奕汉⁴, 李德⁴, 徐屹群⁴

1 南华大学核资源工程学院, 湖南衡阳 421001;
2 核燃料循环技术与装备协同创新中心, 湖南衡阳 421001;
3 南华大学环境与安全工程学院, 湖南衡阳 421001;
4 新疆中核天山铀业有限公司, 新疆伊宁 835000

收稿日期:2017-11-15 修回日期:2018-01-29 出版日期:2018-10-05 发布日期:2018-10-05
通讯作者: 王清良(1969-),男,教授,博士生导师,主要从事铀及其他有色金属的溶浸采矿、生物冶金以及生物废水处理。
作者简介:王清良(1969-),男,教授,博士生导师,主要从事铀及其他有色金属的溶浸采矿、生物冶金以及生物废水处理。E-mail:nhwql@sina.com。
基金资助:
国家自然科学基金（11675072）及南华大学博士科研启动基金（2016XQD03）项目。

Rapid oxidation of Fe²⁺ in adsorption tail liquid of in-situ uranium leaching by Acidithiobacillus ferrivorans

WANG Qingliang^1,2, CHEN Peng¹, HU Eming¹, LI Qiang¹, WANG Hongqiang³, YANG Yihan⁴, LI De⁴, XU Yiqun⁴

1 Nuclear Resources Engineering College, University of South China, Hengyang 42100, Hunan, China;
2 Coorperative Innovation Center of Hunan Province for Nuclear Fuel Cycle Technology & Equipment, Hengyang 421001, Hunan, China;
3 Environmental and Safety Engineering College, University of south China, Hengyang 421001, Hunan, China;
4 CNNC Tianshan Uranium Industry Co., Ltd., Yining 835000, Xinjiang, China

Received:2017-11-15 Revised:2018-01-29 Online:2018-10-05 Published:2018-10-05

摘要/Abstract

摘要： 为解决中温菌在低温吸附尾液中作氧化剂时生长繁殖慢、氧化Fe²⁺速率低等问题，实验结合新疆某酸法地浸采铀现场生产实际，选取耐冷嗜酸硫杆菌作为氧化剂，以生物陶粒为挂膜载体，在生物反应器内对细菌进行固定化培养，研究了细菌快速氧化吸附尾液中Fe²⁺规律。实验结果表明，选用的生物陶粒具有高孔隙率、高透水性、高吸附性和高比表面积等特点，对细菌有较好的吸附固着效果，有利于细菌的生长繁殖，提高了细菌氧化Fe²⁺速率；生物陶粒在pH 1.6~1.7的吸附尾液中具有较强的耐酸性和稳定性；当通气量为20L/h、吸附尾液温度为17~19℃、流量为500L/h时，生物反应器连续氧化Fe²⁺速率达到0.85g/（L·h）；与H₂O₂作氧化剂相比，可以节约费用约72.6%，为实现细菌作氧化剂的工业化应用提供了有力依据。

关键词: 耐冷嗜酸硫杆菌, 生物反应器, 生物陶粒, 地浸采铀, 氧化剂, 吸附尾液

Abstract: To solve these problems, such as the slow growth and reproduction of mesophilic bacteria, slow oxidation rate of Fe²⁺ in the low temperature adsorption tail liquid, based on the field production practice of in-situ leaching uranium by acid method in Xinjiang, Acidithiobacillus ferrivorans was used as the oxidant and the bio-ceramsite was employed as the bio-carrier. Bacteria were immobilized on the surface of bio-ceramsite in the bioreactor. The law of rapid oxidation of Fe²⁺ in the tail fluid was also studied. The results showed that the selected bio-ceramsite had these characteristics of high porosity, high water permeability, high adsorption, and high specific surface area; and the bio-ceramsite had good adsorption and fixation effect on bacteria. These characteristics were beneficial to the growth and reproduction of bacteria. Therefore, the oxidation rate of bacteria on Fe²⁺ was also enhanced. Bio-ceramsite had strong acid-fastness and stability in the adsorption tail fluid with pH 1.6-1.7. When the aeration volume and temperature, flow rate of adsorption tail were 20L/h and 17-19℃, 500L/h, respectively, the continuous oxidation rate of Fe²⁺ in bioreactor could reach 0.85 g/(L·h). Compared to H₂O₂, Acidithiobacillus ferrivorans as the oxidant can save about 72.6% of the cost, which provides a powerful basis for the industrial application of bacteria as oxidant.

Key words: Acidithiobacillus ferrivorans, bioreactor, bio-ceramic, in-situ uranium leaching, oxidant, adsorption tail liquid

中图分类号:

TF18

王清良, 陈鹏, 胡鄂明, 李乾, 王红强, 阳奕汉, 李德, 徐屹群. 耐冷嗜酸硫杆菌快速氧化地浸采铀吸附尾液中Fe²⁺[J]. 化工进展, 2018, 37(10): 3995-4005.

WANG Qingliang, CHEN Peng, HU Eming, LI Qiang, WANG Hongqiang, YANG Yihan, LI De, XU Yiqun. Rapid oxidation of Fe²⁺ in adsorption tail liquid of in-situ uranium leaching by Acidithiobacillus ferrivorans[J]. Chemical Industry and Engineering Progress, 2018, 37(10): 3995-4005.

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耐冷嗜酸硫杆菌快速氧化地浸采铀吸附尾液中Fe²⁺

Rapid oxidation of Fe²⁺ in adsorption tail liquid of in-situ uranium leaching by Acidithiobacillus ferrivorans

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