• 王能,张瑞雪,吴攀,张世鸿,安丽,张予豪,傅渝然.碳酸盐岩对Fe2+生物氧化及铁矿物合成的影响[J].环境科学学报,2021,41(9):3555-3562

  • 碳酸盐岩对Fe2+生物氧化及铁矿物合成的影响
  • The influence of carbonate rock on Fe2+ biological oxidation and iron mineral synthesis
  • 基金项目:国家重点研发计划(No.2019YFC1805300);国家自然科学基金委员会-贵州省人民政府喀斯特科学研究中心项目(No.U1612442);贵州省学科建设项目(No.黔学位合字ZDXK[2016]11)
  • 作者
  • 单位
  • 王能
  • 贵州大学资源与环境工程学院, 贵阳 550025
  • 张瑞雪
  • 1. 贵州大学资源与环境工程学院, 贵阳 550025;2. 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025
  • 吴攀
  • 1. 贵州大学资源与环境工程学院, 贵阳 550025;2. 喀斯特地质资源与环境教育部重点实验室, 贵阳 550025
  • 张世鸿
  • 贵州大学资源与环境工程学院, 贵阳 550025
  • 安丽
  • 贵州大学资源与环境工程学院, 贵阳 550025
  • 张予豪
  • 贵州大学资源与环境工程学院, 贵阳 550025
  • 傅渝然
  • 贵州大学资源与环境工程学院, 贵阳 550025
  • 摘要:利用从高硫煤矸石堆场浸出液中培养驯化获得的氧化亚铁硫杆菌(Acidithiobacillus ferrooxidansA.f),通过静态实验,探讨添加不同量的碳酸盐岩对酸性硫酸盐体系中Fe2+生物氧化速率及次生铁矿物合成的影响.结果表明:添加10 g和30 g碳酸盐岩不会对体系中pH、氧化还原电位(ORP)和Fe2+生物氧化速率产生明显影响,但总铁(TFe)的去除率可从37%分别提高到55%和62%,矿物生成量也从8.17 g·L-1分别增加到12.03 g·L-1和13.69 g·L-1;同时,体系中合成的次生铁矿物相与不加碳酸盐岩时无明显变化,主要为黄铁矾和施氏矿物的混合物.随着碳酸盐岩添加量增至50、70和90 g时,体系pH快速上升,Fe2+生物氧化速率受到抑制,并产生大量结晶程度较好的硫酸钙,形成的铁矿物主要为纤铁矿或针铁矿.而适量的碳酸盐岩添加可使体系中产生Ca2+和Mg2+,从而影响次生铁矿物的合成.因此,在以碳酸盐岩为反应介质的酸性矿山废水处理工艺设计中,可通过添加A.f菌并控制碳酸盐岩投加量,强化系统中Fe2+生物氧化及次生矿物的合成,从而进一步提高反应系统对TFe的去除效果.
  • Abstract:In this study, Acidithiobacillus ferrooxidans (A.f) was incubated and domesticated from the leaching solution of high-sulfur coal gangue yard. Through static experiments, the effects of adding different amounts of carbonate rocks on the biological oxidation rate of Fe2+ and the synthesis of secondary iron minerals in sulfate-rich acidic environment were discussed. The results showed that the addition of 10 g and 30 g carbonate rocks did not have a significant effect on pH, ORP and Fe2+ biological oxidation rate, but the removal rate of TFe increased from 37% to 55% and 62% respectively, and the mineral production also increased from 8.17 g·L-1 to 12.03 g·L-1 and 13.69 g·L-1, respectively. Meanwhile, the secondary iron mineral phase synthesized in the system had no obvious change compared with that without carbonate rocks, and it was mainly a mixture of schwertmannite and jarosite minerals. With the addition of carbonate rocks to 50 g, 70 g and 90 g, the pH in the system increased rapidly, the biological oxidation rate of Fe2+ was inhibited, and a large amount of calcium sulfate with good crystallinity was produced. The iron minerals are mainly lepidocrocite and goethite. The addition of an appropriate amount of carbonate rocks could produce Ca2+ and Mg2+ in the system, thus affecting the synthesis of secondary iron minerals. Therefore, when using carbonate rocks as a reaction medium to treat acid coal mine wastewater, adding A.f. bacteria and controlling the dosage of carbonate rock could strengthen the biological oxidation of Fe2+ and the synthesis of secondary minerals in the system, further improve the removal effect of TFe in the reaction system.

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