进水氮素组成对表面流人工湿地脱氮及N<sub>2</sub>O排放的影响

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Abstract To investigate the influence of influent nitrogen composition on nitrogen removal and N₂O emissions in free water surface constructed wetland with micro-polluted water, four systems were constructed with influent nitrogen compositions of ρ(NH₄⁺-N)/ρ(NO₃^--N)=0:1(CW-A), ρ(NH₄⁺-N)/ρ(NO₃^--N)=0.7:1(CW-B), ρ(NH₄⁺-N)/ρ(NO₃^--N)=4:1(CW-C), and Yanlong Lake surface flow constructed wetland average influent concentration (CW-D), respectively. The characteristics of nitrogen removal and N₂O emission were analyzed, and a method to evaluate the synergistic effect of nitrogen removal and N₂O emission in constructed wetlands was proposed. The results showed that:The average removal rate of total nitrogen (TN) in CW-C with high influent ammonia nitrogen (NH₄⁺-N) ratio was (68.31±14.56)%, which was significantly higher than that of other treatment treatments (P<0.05). Treatment CW-D with the average influent concentration of Yanlong Lake also showed a better nitrogen removal of (41.06±17.55)% with the extension of operation time. The NH₄⁺-N removal rate of treatment CW-A with high influent nitrate nitrogen (NO₃^--N) ratio (-110.12%) was significantly lower than that of other treatment treatments, which was possibly be related to plant absorption characteristics. The NO₃^--N removal rate increased with increasing NO₃^--N concentration. The NO₃^--N removal rate of CW-A with high influent NO₃^--N ratio (87.60%) was significantly higher than that of CW-C with low influent NO₃^--N ratio (39.96%, P<0.05). The N₂O release fluxes for all treatments were (8.73±7.64), (36.68±6.43), (-0.02±7.43) and (15.08±10.77) μg/(m²·h).Treatment CW-C had the lowest N₂O release flux, which was the N₂O absorption sink. Considering the amount and rate of reduction of nitrogen removal and N₂O emission, the synergistic effect of nitrogen removal and N₂O reduction is stronger for high influent NH₄⁺-N ratio ρ(NH₄⁺-N)/ρ(NO₃^--N)=4:1(CW-C).

Key words： nitrogen composition free water surface constructed wetland micro-polluted water nitrogen removal N₂O emission

Received: 26 December 2022

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X524

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	SUN Wei
	LI Yi-ping
	ZHU Li-qin
	ZHANG Hai-kuo
	YAN Chun-min
	SHANG He-qin
	SONG Cong-qing
	LI Da-sheng
	WANG Ling
	SUN Jia-xin

Cite this article:

SUN Wei,LI Yi-ping,ZHU Li-qin等. Effects of influent nitrogen composition on nitrogen removal and N₂O emissions in surface flow constructed wetland with micro-polluted water[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4013-4023.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4013

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