小微黑臭水体修复过程中温室气体排放特征

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摘要为分析小微黑臭水体修复过程中温室气体释放规律,选择典型小微黑臭水体分别设置污染拦截并生态修复(W1)、污染拦截(W2)和污染直排(W3)3组围隔进行对比实验研究.结果表明,在实验期内,污染拦截并生态修复围隔中CO₂、CH₄和N₂O扩散通量分别为(5671.9±1189.5)、(39.2±10.1)和(4.2±2.2)μmol/(m²·h),其CO₂当量贡献率分别为76.51%、6.54%和16.95%;仅污染拦截围隔中CO₂、CH₄和N₂O扩散通量分别为(1139.3±1169.6)、(102.1±35.6)和(20.0±14.1)μmol/(m²·h),其CO₂当量贡献率分别为13.64%、15.12%和71.24%;污染直排围隔中CO₂、CH₄和N₂O扩散通量分别为(9140.3±256.4)、(1126.8±215.1)和(1.8±1.7)μmol/(m²·h),其CO₂当量贡献率分别为38.74%、59.04%和2.22%.实验围隔中三大温室气体释放CO₂总当量大小表现为:污染直排>污染拦截>生态修复.污染直排围隔(W3)中缺氧且沉积物有机质含量较高,有机质降解过程中消耗大量O₂并释放CH₄和CO₂,导致其释放通量及当量贡献率较高;污染拦截围隔(W2)发生了水体富营养化及藻类水华,藻类光合作用产氧消耗CO₂并释放N₂O,导致N₂O较高、CO₂较低,N₂O是其当量最主要贡献者;污染拦截并生态修复围隔(W1)中DO较高,抑制CH₄产生并加速氧化,同时抑制反硝化作用导致N₂O较低,减少了向大气的总温室气体排放.

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关键词 ：小微黑臭水体, 温室气体排放, CO₂、CH₄和N₂O当量贡献, 生态修复

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

收稿日期: 2023-01-19

PACS:

X52

基金资助:国家自然科学基金资助项目(52079075,U2040220,52079074)；湖北省杰出青年基金资助项目(2021CFA097)

通讯作者: 杨正健,教授,yangzj1984@ctgu.edu.cn E-mail: yangzj1984@ctgu.edu.cn

作者简介: 陈成(1998-),男,安徽安庆人,三峡大学硕士研究生,主要从事河湖生态修复方向研究.745052483@qq.com

引用本文:

陈成, 杨正健, 王从锋, 郭小娟, 唐金云. 小微黑臭水体修复过程中温室气体排放特征[J]. 中国环境科学, 2023, 43(8): 4211-4218. CHEN Cheng, YANG Zheng-jian, WANG Cong-feng, GUO Xiao-juan, TANG Jin-yun. Greenhouse gases emissions in high polluted water and its restoration. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4211-4218.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2023/V43/I8/4211

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