Feammox污泥快速富集、脱氮特性和微生物群落结构

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Abstract In this study, the effect of pH value on Ferric ammonium oxidation (Feammox) performance was investigated under the micro oxygen environment through short-term experiments. The initial NH₄⁺-N and Fe³⁺concentrations in the batch experiment were 70.0 and 300.0mg/L, respectively. When no ferric iron was added, the activated sludge could use dissolved oxygen for ammonium oxidation, and the removal amount of NH₄⁺-N was 8.8mg/L. After adding ferric iron, the removal amount of NH₄⁺-N increased to 76.9mg/L. Compared with the experiment without adding ferric iron, the removal amount of NH₄⁺-N in activated sludge increased by 7.7times. Moreover, the nitrogen removal performance and functional microorganisms of the activated sludge-Feammox reactor were investigated through long-term experiments. After acclimation, the average NH₄⁺-N removal rate of the Feammox reactor reached 1.6mg N/(g VSS·d). In a typical cycle, the pH value decreased from 9.0 to 7.8, and the NH₄⁺-N concentration decreased from 35.5mg/L to 1.9mg/L. The NO₂^--N concentration increased from 11.2mg/L to 18.1mg/L, and the NO₃^--N concentration increased from 8.1mg/L to 13.4mg/L. The total inorganic nitrogen (TIN) concentration decreased from 54.8mg/L to 33.3mg/L. In mature Feammox sludge, the dominant iron reducing bacteria were unclassified Acidobacter (1.92%) and Pseudomonas (0.22%), which might play an important role in ferric ammonium oxidation.

Key words： activated sludge anaerobic iron ammonium oxidation different pH rapid cultivation strategy microbial community analysis

Received: 03 December 2022

PACS:

X703.5

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	LI Zhe
	LI Jun
	ZHENG Zhao-ming

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LI Zhe,LI Jun,ZHENG Zhao-ming. Research on the rapid cultivation of Feammox sludge, nitrogen removal characteristics and microbial community structure of Feammox process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3464-3471.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I7/3464

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