脱氮硫杆菌利用FeS自养反硝化过程研究

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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 byThiobacillus 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).

作者	单位
周翔,张玉,孙超越,苏志强,孙利剑

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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.) denitrificansATCC 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. denitrificansutilizing 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.

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