引用本文:
邢贝米, 王湧, 刘鹤蒙, 金鹏康. 城市污水管网中有机与无机氮源对水质转化的影响作用[J]. 环境化学, 2018, 37(9): 1978-1986
XING Beimi, WANG Yong, LIU Hemeng, JIN Pengkang. The influence of organic and inorganic nitrogen sources on water quality transformation in urban sewer pipe[J]. Environmental Chemistry, 2018, 37(9): 1978-1986

城市污水管网中有机与无机氮源对水质转化的影响作用
邢贝米, 王湧, 刘鹤蒙, 金鹏康
西安建筑科技大学, 西安, 710055
摘要:
全文通过建立两套长度为1200 m的城市污水管道收集系统,系统对比研究了城市污水管网中有机氮、无机氮对城市污水水质的转化规律与影响机制.结果表明,两种条件下污水中COD含量均随沿程逐渐降低,总磷含量基本保持不变,但以有机氮作为氮源,管道系统中蛋白质含量随沿程减少,NH3-N由最初的零逐渐增加,NO2-N含量低于0.05 mg·L-1,NO3-N基本没有;以无机氮作为氮源,管道系统中NH3-N含量随沿程逐渐减少,蛋白质由最初的零逐渐增加,NO2-N含量低于0.05 mg·L-1,NO3-N未检测出.通过测定两系统中分子量分布和三维荧光光谱随沿程的变化以及出水氨基酸的种类,研究了造成水质变化的原因.结果表明,两系统中主要有机物均为蛋白类和腐殖质类物质,相对分子质量主要集中在小分子区间,大分子区间响应值较小,但以有机氮作为氮源,系统内荧光强度减弱,主要以组氨酸、精氨酸、苏氨酸为主,共12种氨基酸;以无机氮作为氮源,系统内荧光强度增加,主要以丝氨酸、精氨酸、异亮氨酸为主,共8种氨基酸.为了更深程度的了解系统内氮类物质的转化原因,对两系统内生物膜进行FISH分析,发现系统内存在发酵菌、水解酸化菌等说明在微生物的作用下使得氮类营养物质发生改变,进而引起系统内水质发生改变.
关键词:    城市污水管网    水质转化    有机氮    无机氮    荧光特性    生物膜   
The influence of organic and inorganic nitrogen sources on water quality transformation in urban sewer pipe
XING Beimi, WANG Yong, LIU Hemeng, JIN Pengkang
Xi'an University of Architecture and Technology, Xi'an, 710055, China
Abstract:
In this study, transformation and mechanisms of organic nitrogen and inorganic nitrogen on water quality were studied in two 1200 m pilot experimental sewer systems. The results showed that COD concentration declined and the TP content remained stable along the sewer whether organic nitrogen or inorganic nitrogen was the prime nitrogen source. When organic nitrogen was the prime source of nitrogen, protein content decreased while NH3-N increased gradually along the sewer pipe. On the contrary, NH3-N content decreased and protein increased gradually when inorganic nitrogen was the prime source of nitrogen. Meanwhile, NO2-N content was less than 0.05 mg·L-1, and NO3-N was not detected in each system. To further investigate the reasons of water quality change, molecular weight distribution, three-dimensional fluorescence and the concentration of amino acids in two sewer systems were analysed. The findings showed that low molecular weight substances such as proteins and humic were dominated in the sewer pipe. In addition, when organic nitrogen was the prime nitrogen source, fluorescence intensity decreased along the sewer, and the amino acids mainly consisted of histidine, arginine, threonine and so on. When inorganic nitrogen was the prime nitrogen source, the fluorescence intensity increase and there were eight major amino acids such as serine, arginine and isoleucine et al. FISH was applied to reveal the transformation pattern of nitrogen compounds in the system. The results indicated that the bacterias such as fermentation bacteria, hydrogen-producing acetogen, methanogens, lead to the changes of water quality in the two sewer pipes.
Key words:    urban sewer system    water quality transformation    organic nitrogen    inorganic nitrogen    fluorescence characteristics    biofilm   
收稿日期: 2017-10-25
基金项目: 国家水体污染控制与治理科技重大专项(2012zx07313001)和陕西省科技统筹创新工程计划项目(2016TZC-S-19-3)资助.
金鹏康,Tel:13379217572,E-mail:pkjin@hotmail.com
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