CO_(2)对A.ferrooxidans活性和次生铁矿物形成的影响  

Effect of CO_(2) on the activity and formation of secondary iron minerals by Acidithiobacillus ferrooxidans

作　　者：黄海涛[1,2] 耿康慧 伍贤辉 王崇 魏彩春[1,2] HUANG Hai-tao;GENG Kang-hui;WU Xian-hui;WANG Chong;WEI Cai-chun(College of Environmental Science and Engineering,Guilin University of Technology,Guilin 541004,China;Guilin University of Technology,Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin 541004,China;Modern Industry College of Ecology and Environmental Protection,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学,环境科学与工程学院,广西桂林541004 [2]桂林理工大学,广西环境污染控制理论与技术重点实验室,岩溶地区水污染控制与用水安全保障协同创新中心,广西桂林541004 [3]桂林理工大学生态环保现代产业学院,广西桂林541004

出　　处：《中国环境科学》2024年第5期2652-2659,共8页China Environmental Science

基　　金：广西环境污染控制理论与技术重点实验室科教结合科技创新基地项目;广西环境污染控制理论与技术重点实验室研究基金资助项目(1601Z005);桂林理工大学科研启动基金资助项目(GUTQDJJ 2005020)。

摘　　要：通过摇瓶试验模拟富铁富硫酸盐环境,研究了在0.03%(空气中CO_(2)含量),3%,6%,9%和12%浓度的CO_(2)条件下对Acidithiobacillus ferrooxidans活性及次生铁矿物形成的影响,并分析了pH值,Fe^(2+)氧化率及氧化速率,总Fe沉淀率以及次生铁矿物矿相等相关指标.结果表明,CO_(2)浓度为3%时,菌氧化Fe^(2+)能力最强,72h时Fe^(2+)氧化率达到100%,试验结束时总Fe沉淀率最高,为42.8%.随着CO_(2)浓度增加,各体系A.ferrooxidans活性受到抑制.不同CO_(2)浓度体系最终获得矿物均为黄铁矾类矿物混合少量施氏矿物.适当提高CO_(2)浓度,有助于提高A.ferrooxidans活性,并促进水解成矿增加矿物产量.本研究为酸性矿山废水的治理提供理论依据.The effects of 0.03%(CO_(2) content in air),3%,6%,9%and 12%CO_(2) concentrations on the activity of Acidithiobacillus ferrooxidans and the formation of secondary iron minerals were studied using shaking flask experiments to simulate the iron-rich and sulfate-rich environment.The pH,Fe^(2+)oxidation rate and oxidation rate,total Fe precipitation rate and secondary iron mineral phase-related indicators were analysed.The results showed that when the concentration of CO_(2) was 3%,the ability of bacteria to oxidise Fe^(2+)was the strongest and the oxidation efficiency of Fe^(2+)reached 100%at 72h.At the end of the experiment,the total Fe precipitation rate was the highest,at 42.8%.With the increase in CO_(2) concentration,the activity of A.ferrooxidans in each system was inhibited.The final minerals obtained in different CO_(2) concentration systems were all jarosite minerals mixed with a small amount of schwertmannite.An appropriate increase in CO_(2) concentration is therefore helpful to improve the activity of A.ferrooxidans and promote hydrolysis mineralisation,thus increasing mineral yield.This study provides a theoretical basis for the treatment of acid mine wastewater.

关 键 词：CO_(2) 嗜酸性氧化亚铁硫杆菌 生物氧化 次生铁矿物 

分 类 号：X172[环境科学与工程—环境科学]