纳米零价铁强化克雷伯氏菌的反硝化影响研究
Study on impact of nano zero-valent iron enhanced Klebsiella oxytoca on denitrification
Anaerobic denitrification by Klebsiella sp.-LJB2 in the presence of nanoscale zero-valent iron (nZVI) and its mechanism are investigated.In this experiment,a serum bottle device is employed to inoculate Klebsiella sp.-LJB2 for rapid initiation of the short-range denitrification process,to which a closed device for the short-range denitrification reaction with the addition of iron is constructed by adding nanoscale zero-valent iron (nZVI).The interaction between nZVI and Klebsiella sp.-LJB2 as well as their nitrogen removal contribution are elucidated.The influencing mechanism of nitrogen removal efficacy,and microbial population response characteristics at different C/N ratios and pH values are investigated.It is verified that nZVI accelerates the removal of nitrogen in nitrate and ammoniacal nitrogen,and reduces the accumulation of nitrogen in nitrite.The dosage of nZVI is a key factor influencing the effect of anaerobic denitrification.The results show that nZVI can effectively increase the nitrogen removal rate in wastewater.The electron transfer efficiency of Klebsiella sp.-LJB2 is enhanced by ZVI.In addition,nZVI promotes the activity of denitrifying enzymes,and stimulates the expression of denitrifying enzyme and related genes in anaerobic denitrification.
biological denitrification of wastewater / nano zero-valent iron / nitrate reduction / denitrification mechanism
| [1] |
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| [2] |
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| [3] |
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| [4] |
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| [5] |
|
| [6] |
|
| [7] |
|
| [8] |
|
| [9] |
|
| [10] |
|
| [11] |
|
| [12] |
|
| [13] |
|
| [14] |
|
| [15] |
|
| [16] |
|
| [17] |
|
| [18] |
|
| [19] |
|
| [20] |
|
| [21] |
|
| [22] |
|
| [23] |
|
| [24] |
|
| [25] |
|
| [26] |
|
| [27] |
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国家自然科学基金(202302090301012)
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