雨水管道沉积物中典型无机氮的干期粒径分布

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摘要以南京江北新区分流制雨水管道沉积物为研究对象，考察不同粒径沉积物中铵态氮（NH₃-N）和硝态氮（NO₃^--N）干期分布特征，分析其随干期长度的变化关系，并探讨沉积物理化性质及微生物菌群结构对NH₃-N和NO₃^--N干期分布的影响.结果表明：粒径≤0.075mm的沉积物中NH₃-N占比最高（交通区30.8%，商业区36.7%）；交通区粒径≤0.075mm的沉积物中NO₃^--N占比最高（33.0%），而商业区粒径0.075~0.15mm沉积物中NO₃^--N占比最高（34.4%）；干期长度与交通区0.075~0.15mm粒径段的沉积物中NO₃^--N含量及商业区粒径≥0.3mm的沉积物中NH₃-N含量之间的相关性均最显著；雨水管道沉积物中NH₃-N和NO₃^--N的干期分布与O-H和N-H等官能团、表面极性和亲水性、微观形貌等有一定关联；交通区雨水管道沉积物中Gemmobacter等反硝化优势菌种（相对丰度总和为20.15%）对NO₃^--N干期分布影响更显著.

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	索鹏程
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关键词 ：雨水管道沉积物, 铵态氮, 硝态氮, 颗粒粒径, 微生物菌群结构

Abstract：Separate rainwater pipeline sediments from Jiangbei New District, Nanjing, were selected as research objects, in order to the distribution characteristics for both NH₃-N and NO₃^--N attached in sediments with different particle sizes during dry periods, the change of the mentioned distribution with the length of dry periods, and the effect of physicochemical properties and microbial flora structure. The results showed that NH₃-N contents accounted for the highest proportion in sediments with particle size≤0.075mm (traffic area 30.8%, commercial area 36.7%). The proportion of NO₃^--N in sediments with particle size≤0.075mm in the traffic area was the largest (33.0%), while there was the highest (34.4%) in sediments with particle size of 0.075~0.15mm in commercial area. The length of dry periods had the most significant correlation with NO₃^--N content in sediments with particle size 0.075~0.15mm in traffic area, as well as NH₃-N content in sediments with particle size≥0.3mm in commercial area. The distribution of NH₃-N and NO₃^--N in rainwater pipeline sediments during dry periods had a certain degree relation with the functional groups (O-H and N-H), surface polarity, hydrophilicity, and micro-morphology. The dominant denitrification bacteria (the total relative abundance was 20.15%) in rainwater pipeline sediments from the traffic area, like Gemmobacter, had the relatively obvious influence on the distribution of NO₃^--N during dry periods.

Key words： rainwater pipeline sediments ammonium nitrogen nitrate nitrogen particle size microbial flora structure

收稿日期: 2020-04-19

PACS:

X131.2

基金资助:江苏省教育厅“江苏特聘教授”人才计划项目（1421071801005）；无锡市科技发展资金资助项目（N20193002）；江苏省水利科技项目（2019032）

通讯作者: 左晓俊,教授,z850108xj@163.com E-mail: z850108xj@163.com

作者简介: 索鹏程(1996-),男,安徽滁州人,南京信息工程大学,硕士研究生,主要研究方向为水污染控制技术与原理.

引用本文:

索鹏程, 王帮国, 陈春伟, 左晓俊, 徐强强, 孙文龙, 陈斌. 雨水管道沉积物中典型无机氮的干期粒径分布[J]. 中国环境科学, 2020, 40(12): 5352-5360. SUO Peng-cheng, WANG Bang-guo, CHEN Chun-wei, ZUO Xiao-jun, XU Qiang-qiang, SUN Wen-long, Chen Bin. Particle sizes distribution of typical inorganic nitrogen from rainwater pipeline sediments during dry periods. CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(12): 5352-5360.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2020/V40/I12/5352

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