首页|曝气位置对铁碳-沸石人工湿地污染物去除和温室气体排放的影响及微生物群落分析

曝气位置对铁碳-沸石人工湿地污染物去除和温室气体排放的影响及微生物群落分析

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  • 国家科技期刊平台
  • NETL
  • NSTL
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为探究曝气位置与铁碳-沸石填充体积比对人工湿地污水净化及温室气体排放的影响,根据曝气位置和铁碳-沸石填料体积比不同构建了 8个人工湿地,其中全程曝气处理分别为:F8T2(80％沸石+20％铁碳)、F6T4(60％沸石+40％铁碳)、F4T6(40％沸石+60％铁碳)、以及对照组F(100％沸石);半程曝气人工湿地分别对应为:F8T2-P、F6T4-P、F4T6-P和F-P.对人工湿地系统出水水质、温室气体和微生物群落进行分析测定.结果表明,与全程曝气相比,半程曝气显著提升了各人工湿地上层水中DO的含量(P＜0.05),COD和NO3--N去除率均达到94.5％以上,F8T2-P、F6T4-P和F4T6-P出水中NH4+-N平均质量浓度分别显著降低了 50.40％、54.18％和51.00％(P＜0.05).曝气位置对铁碳-沸石人工湿地CH4排放影响并不显著,但显著减少了 N2O的排放(P＜0.05).相较于全程曝气人工湿地,F8T2-P、F6T4-P和F4T6-P中N2O排放通量分别显著降低了 44.03％、35.62％和44.54％(P＜0.05).添加铁碳增加了 pmoA、nosZ、nir和nirK基因丰度,降低了mcrA基因丰度,这些基因与反硝化过程和温室气体排放有关;同时,F8T2-P、F6T4-P 和 F4T6-P 中优势菌属 Micropruina、Propionicicella、Nitrospria,Thauera、Denitratisoma、Dechloromonas 有利于硝化和反硝化反应的进行.半程曝气且铁碳与沸石体积比为2∶8的人工湿地,具备最佳的污染物去除和温室气体减排潜能.
Effects of aeration location on water purification and greenhouse gas emission of iron-carbon-zeolite constructed wetland and its microbial community
In order to explore the effects of aeration position and volume ratio of Fe-C to zeolite on pollutant removal and greenhouse gas(GHG)emissions in Fe-C-zeolite constructed wetlands,eight constructed wetlands with different aeration positions and Fe-C zeolite filling ratios were constructed as follows:(1)whole-way aeration constructed wetlands included F8T2(80％zeolite+20％Fe-C),F6T4(60％zeolite+40％Fe-C),F4T6(40％zeolite+60％Fe-C),and control group F(100％zeolite);(2)half-way aeration constructed wetlands included F8T2-P,F6T4-P,F4T6-P and F-P.The changes in effluent quality and fluxes of CH4 and N2O were tested,then microbial communities in half-aerated constructed wetlands were analyzed.The results showed that comparing with whole-way aeration constructed wetlands,half-way aeration constructed wetlands significantly increased DO concentration in upper water layer of the constructed wetland(P＜0.05),and the COD and NO3--N removal rates reached over 94.5％in both groups,the average concentrations of NH4+-N in effluent of F8T2-P,F6T4-P,and F4T6-P decreased significantly by 50.40％,54.18％,and 51.00％,respectively(P＜0.05).Aeration position had no significant effect on CH4 emission from Fe-C-zeolite constructed wetlands,but significantly reduced N2O emission(P＜0.05).The N2O fluxes of F8T2-P,F6T4-P,and F4T6-P were significantly reduced by 44.03％,35.62％and 44.54％,respectively(P＜0.05),compared with the whole-way aeration constructed wetlands.The presence of Fe-C increased the abundances of pmoA,nosZ,nirS,and nirK genes and decreased the abundances of the mcrA gene,which were involved in denitrification and GHG emissions.Meanwhile,the dominant genera Micropruina,Propionicicella,Nitrospria,Thauera,Denitratisoma,and Dechloromonas in F8T2-P,F6T4-P,and F4T6-P favored the nitrification and denitrification reactions.The constructed wetland with half-way aeration and a 2:8 volume ratio of Fe-C to zeolite had the best potential for high pollutant removal and low greenhouse gas emissions.

constructed wetlandiron-carbon micro-electrolysisaeration locationgreenhouse gas emissionsmicrobial communities

王珣郦、郝庆菊、王晓静、苟永祥、陈芳慧、贺阳剑、江长胜

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西南大学资源环境学院,三峡库区生态环境教育部重点实验室,重庆 400715

西南大学创新创业学院,重庆 400715

人工湿地 铁碳微电解 曝气位置 温室气体排放 微生物群落

国家自然科学基金面上项目重庆市大学生创新训练项目

41977186S202310635022

2024

10.12030/j.cjee.202404024

环境工程学报
中国科学院生态环境研究中心

环境工程学报

CSTPCD北大核心
影响因子：0.804
ISSN：1673-9108
年,卷(期)：2024.18(8)