耐冷嗜酸硫杆菌快速氧化地浸采铀吸附尾液中Fe^(2+)  

Rapid oxidation of Fe^(2+) in adsorption tail liquid of in-situ uranium leaching by Acidithiobacillus ferrivorans

作　　者：王清良[1,2] 陈鹏 胡鄂明[1] 李乾[1] 王红强[3] 阳奕汉[4] 李德 徐屹群 WANG Qingliang;CHEN Peng;HU Eming;LI Qiang;WANG Hongqiang;YANG Yihan;LI De;XU Yiqun(Nuclear Resources Engineering College,University of South China,Hengyang 42100,Hunan,China;Coorperative Innovation Center of Hunan Province for Nuclear Fuel Cycle Technology&Equipment,Hengyang 421001,Hunan,China;Environmental and Safety Engineering College,University of south China,Hengyang 421001,Hunan,China;CNNC Tianshan Uranium Industry Co.,Ltd.,Yining 835000,Xinjiang,China)

机构地区：[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

出　　处：《化工进展》2018年第10期3995-4005,共11页Chemical Industry and Engineering Progress

基　　金：国家自然科学基金(11675072);南华大学博士科研启动基金(2016XQD03)项目

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Fe^(2+)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Fe^(2+)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Fe^(2+)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Fe^(2+)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。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.

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 

分 类 号：TF18[冶金工程—冶金物理化学]