拔风管对CANON型人工湿地脱氮性能的影响

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Abstract This study was conducted to explore the effects of air duct on nitrogen transformation mechanisms and the associated microbiological characteristics in a tidal flow constructed wetland (TFCW) with CANON process when treating digested swine wastewater. The results showed that, the air duct number significantly affected quantities and activities of the functional microbes in the TFCWs. Correspondingly, nitrogen transformation rates in the systems fluctuated at the different five numbers of air duct. On the premise that the hydraulic loading rate (HLR) was no more than 0.18m³/(m²·d), the redox microenvironment gradually optimized in the bed of the TFCW as the air duct number increased from 0 to 6, which was conductive to the enhancement of nitritation and the enrichment of ANAMMOX bacteria (AnAOB). Subsequently, the simultaneous nitrification, ANAMMOX, and denitrification (SNAD) processes occurred in the TFCW, resulting in the improvement of nitrogen removal in the system. However, as the air duct number was more than 6, the stabilization of nitritation in the TFCW was impaired partly owing to the proliferation and increased activities of nitrite oxidizing bacteria (NOB), and then the ANAMMOX process and the denitrification process were both inhibited with the nitrogen removal performance of the system declined. Regarding to the TFCW operating with HLR of 0.18m³/(m²·d), as the air duct number was 6, the relative abundances of Nitrosomomas (the major bacteria of AOB) and Candidutus Brocadia (the major bacteria of AnAOB) could respectively reach up to 20.05% and 18.38% in the system, while the relative abundances of Nitrospira (the major bacteria of NOB) was at a low level of 1.92%. Correspondingly, the CANON process was enhanced effectively in the system, and this process could be coupled with the denitrification process dominated by Denitratisoma (the major bacteria of denitrifiers) with the relative abundance of 15.18%, resulting that the TN and NH₄⁺-N removal rates of the TFCW were (90.29±3.70)% and (93.30±2.97)%, respectively.

Key words： tidal flow constructed wetland(TFCW) air duct complete autotrophic nitrogen removal over nitrite(CANON) partial nitrification nitrogen transformation

Received: 12 July 2021

PACS:

X703.1

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	Articles by authors
	ZHAO Zi-jian
	CHENG Rui
	HE Kai-wen
	HU Jing-jing
	HU Ying-ying
	WANG Zhen

Cite this article:

ZHAO Zi-jian,CHENG Rui,HE Kai-wen等. Effect of air duct on nitrogen removal performance of a constructed wetland system with CANON process[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(3): 1191-1201.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I3/1191

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