| 周翔,张玉,孙超越,苏志强,孙利剑.脱氮硫杆菌利用FeS自养反硝化过程研究[J].,2019,59(5):455-461 |
| 脱氮硫杆菌利用FeS自养反硝化过程研究 |
| Study of autotrophic denitrification process conducted byThiobacillus denitrificans utilizing FeS |
| |
| DOI：10.7511/dllgxb201905003 |
| 中文关键词: 脱氮硫杆菌 硫化亚铁(FeS) 自养反硝化 反应动力学 |
| 英文关键词: Thiobacillus denitrificans ferrous sulfide (FeS) autotrophic denitrification reaction dynamics |
| 基金项目:国家自然科学基金资助项目(51578106). |
|
| 摘要点击次数: 772 |
| 全文下载次数: 786 |
| 中文摘要: |
| 以硫化亚铁(FeS)为电子供体的自养反硝化反应对水体中硝酸盐的去除有重要贡献．以菌株Thiobacillus (T.) denitrificansATCC 25259为对象，首次研究了脱氮硫杆菌以FeS为底物的自养反硝化过程．结果表明，以FeS作为唯一电子供体时，T. denitrificans可以将NO-3-N(30 mg·L-1)彻底还原为N2．同时，FeS中的硫元素经自养反硝化过程转化为SO2-4，而铁元素与培养基中PO3-4反应生成沉淀物Fe3(PO4)2·8H2O．通过对相关数据拟合发现自养反硝化过程遵循零级反应动力学(R2>0.93)，随着FeS加入量的增大，NO-3和NO-2的还原速率均增大，但NO-3的还原速率增大更多，使中间产物NO-2的累积量增大． |
| 英文摘要: |
| The autotrophic denitrification reaction with ferrous sulfide (FeS) as the electron donor plays a significant role in nitrate removal in water body. The strain Thiobacillus (T.) denitrificans ATCC 25259 is novelly applied to investigate the process of autotrophic denitrification with FeS as substrate. The results exhibit that NO-3-N (30 mg·L-1) is finally reduced to N2 by T. denitrificansutilizing FeS as the sole electron donor. The elemental sulphur in FeS is converted to SO2-4 via autotrophic denitrification, whereas the elemental iron is precipitated with PO3-4 as the form of Fe3(PO4)2·8H2O.Besides, according to the fitted curves, this autotrophic denitrification process is demonstrated to accord with the zero-order kinetics (R2>0.93). As the rising amount of FeS, both the reduction rates of NO-2 and NO-3 increase. Additionally, the reduction rate of NO-3 grows even more sharply, which accounts for the improved accumulation concentration of NO-2 as intermediates. |
|
查看全文
查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|