SO<sub>3</sub><sup>2-</sup>驱动自养短程反硝化工艺亚硝酸盐积累特性研究

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Abstract This study developed a novel process of sulfite-driven autotrophic partial denitrification (SDAPD) to achieve the rapid accumulation of NO₂^--N. Anaerobic sequencing batch biofilm reactors were used to explore the effects on nitrite accumulation under different influent nitrate concentration (25~250mg/L) and different S/N molar ratios (0.8,1.7,2.6). The results show that nitrite accumulation rate (NAR) increased with the increase of influent nitrate concentration, and the S/N can significantly affect the NAR. The NAR was the highest up to (64.7%±3.0%) at S/N of 1.7. Periodic experiments show that nitrate reduction and nitrite accumulation were accompanied by sulfite removal and sulfate production. High S/N could promote the production of protein and polysaccharide in extracellular polymer (EPS) and increase the ratio of PN/PS. Three-dimensional fluorescence spectra shows that the tryptophan was the main component of EPS in SDAPD system, and its fluorescence peak and fluorescence intensity were closely related to S/N. High-throughput sequencing found that Thiobacillus and Thermomonas were key bacteria with the function of sulfur autotrophic denitrification.

Key words： sulfite autotrophic partial denitrification nitrite accumulation sulfur to nitrogen ratio microbial community

Received: 06 April 2023

PACS:

X703

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	NIE Yu-ting
	ZHOU Xin
	PING Cai-xia

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NIE Yu-ting,ZHOU Xin,PING Cai-xia. Nitrite accumulation characteristics in a SO₃^2--driven partial autotrophic denitrification process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(11): 5719-5727.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I11/5719

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