小微黑臭水体修复过程中温室气体排放特征

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Abstract In order to analyze the greenhouse gases emissions in high polluted water, three experimental enclosures were set as:pollution intercepted and ecological restoration treated enclosure (W1), pollution intercepted enclosure (W2) and no treatment enclosure (W3). The CO₂, CH₄ and N₂O diffusion fluxes in W1 were (5671.9±1189.5) μmol/(m²·h), (39.2±10.1) μmol/(m²·h) and (4.2±2.2) μmol/(m²·h), respectively, and contributed for 76.51%, 6.54% and 16.95% of the total CO₂ equivalent emission. In the pollution intercepted enclosure W2, the CO₂, CH₄ and N₂O diffusion fluxes were (1139.3±1169.6) μmol/(m²·h), (102.1±35.6) μmol/(m²·h) and (20.0±14.1) μmol/(m²·h), and contributed for 13.64%, 15.12% and 71.24% of the total CO₂ equivalent emission. In no treatment enclosure W3, the CO₂, CH₄ and N₂O diffusion fluxes were (9140.3±256.4) μmol/(m²·h), (1126.8±215.1) μmol/(m²·h) and (1.8±1.7) μmol/(m²·h), and contributed for 38.74%, 59.04% and 2.22% of the total CO₂ equivalent emission. The total greenhouse gases emission in the experimental enclosures sorted as:no treatment high polluted water > pollution intercepted enclosure > pollution intercepted and ecological restoration treated enclosure. Organic matter degradation in no treatment enclosure W3 resulted in anoxic and high CH₄ and CO₂ emission. In pollution intercepted enclosure W2, eutrophication and algal bloom occurred. Algae photosynthesis consumed CO₂ and released N₂O, therefor N₂O was the main contributor (71.24%) to the total emission. The high DO in the pollution intercepted and ecological restoration enclosure (W1) inhibited the production of CH₄ and accelerated its oxidation, and the inhibition of denitrification resulted in low N₂O, which reduced the total greenhouse gases emissions to the atmosphere.

Key words： high polluted water greenhouse gases emissions CO₂, CH₄ and N₂O contribution ecological restoration

Received: 19 January 2023

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	CHEN Cheng
	YANG Zheng-jian
	WANG Cong-feng
	GUO Xiao-juan
	TANG Jin-yun

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CHEN Cheng,YANG Zheng-jian,WANG Cong-feng等. Greenhouse gases emissions in high polluted water and its restoration[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4211-4218.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4211

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