水钠锰矿对沉积物反硝化过程的影响机制

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Abstract The effect mechanism of K-Birnessite on denitrification were investigated by exposing the sediments of Qingshuixi Section, a tributary of Jialing River, Chongqing, to different contents of δ-MnO₂ (0,2,4,7g/kg). The findings revealed that δ-MnO₂ inhibited the activity of microbial electron transport system (ETS) in the sediment, resulting in a decrease in key enzyme activities in the denitrification process [nitrate reductase (NAR): 9.62%~43.64%; nitrite reductase (NiRs): 29.13%~69.39%; nitric oxide reductase (NOR): 22.55%~44.87%; nitrous oxide reductase (NOS): 20.48%~68.80%, whereas inhibited the entire denitrification process, specially significantly decreased the sediment NO₃^--N reduction rate (23.47%~89.30%) in each experimental group during 0to 3h. Additionally, δ-MnO₂ significantly decreased the ratio of NiRs/NOS, which may have contributed to the N₂O release reduction (2.65%~28.55%) observed. The results of the microbiological investigation showed that δ-MnO₂ alters the makeup of the microbial community, causing it to evolve towards an environment adapted to high Mn content. Manganese redox-related species were enriched, including Exiguobacterium_sibiricum_255-15 of Firmicutes, Bacillus simplex of Firmicutes and Pseudomonadales of Proteobacteria. However, the abundance of Trichococcus linked to sediment heterotrophic denitrification decreased, which may be the underlying cause for the deterioration of sediment denitrification performance after δ-MnO₂ exposure.

Key words： δ-MnO₂ sediments denitrification N₂O

Received: 08 December 2022

PACS:

X703

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	Articles by authors
	XU Wei-mo
	ZHANG Long
	LI Run-jia
	CAO Li
	LONG Dan
	LIU Dan-yang
	ZHANG Li-pan
	AI Hai-nan

Cite this article:

XU Wei-mo,ZHANG Long,LI Run-jia等. The effect mechanism of K-Birnessite on denitrification in sediments[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3704-3712.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3704

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