Fe(Ⅲ)对Anammox污泥脱氮效能长短期影响

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Abstract The effects of Fe(Ⅲ) concentration on nitrogen removal efficiency in Anammox sludge were studied in short-term and long-term. The proper amount of Fe(Ⅲ) could enhance the nitrogen removal efficiency of Anammox bacteria,0.09mol/L was the most suitable concentration, the nitrogen removal rate was 0.238kg/(L·d), compared with the control group increased by 14.2%. The nitrogen removal rate was decreased gradually with the influent Fe(Ⅲ) concentration increased constantly. When the Fe(Ⅲ) concentration increased to 0.18mol/L, the nitrogen removal rate dropped to 0.215kg/(L·d)decreased by 10.75% compare with 0.09mol/L. The half-saturation constant (K_Fe) was 0.012mol/L, the inhibiting kinetic constant (K_I) was 0.449mol/L obtained by Haldane inhibition kinetic model fitting. The long-term experiment results showed that at 0.09mol/L Fe(Ⅲ) concentration, the nitrogen removal rate of Anammox increased the fastest, and gradually decreased with the increase of Fe(Ⅲ) concentration. the conversion ratio of NO₂^--N and NH₄⁺-N was significantly lower than the theoretical value of 1.32, fluctuate between 1.108 and 1.227, and decreased with the increase of concentration of Fe(Ⅲ), presumably due to the addition of Fe(Ⅲ) instead of NO₂^--N as electron acceptor. Scanning electron microscope results showed that the addition of Fe(Ⅲ) could make the Anammox bacteria cell structure more stable.

Key words： Fe(Ⅲ) anammox nitrogen removal performance inhibition kinetics scanning electron microscope

Received: 10 July 2023

PACS:

X703.5

Corresponding Authors: 李祥,副教授,anammox@126.com E-mail: anammox@126.com

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	GUO Jia-wen
	LIN Xin
	LI Xiang
	HUANG Yong
	LIU Tian-qi
	ZHAO Wei-dong

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GUO Jia-wen,LIN Xin,LI Xiang等. The long-term and short-term effect of Fe(Ⅲ) on nitrogen removal efficiency of Anammox sludge[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(3): 1278-1285.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I3/1278

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