目录
摘要I
关键词I
AbstractII
引言
引言1
1绪论1
1.1课题背景 1
1.1.1纳米银的应用领域1
1.1.2纳米银的未来发展展望1
1.1.3纳米银的抗菌性2
1.2纳米银对环境的影响2
1.3纳米银对污水生物处理系统的影响2
1.3.1纳米银对污水厌氧生物处理的影响2
1.3.2纳米银对污水好氧生物处理的影响3
1.3.3纳米银对污水生物处理影响的原因3
1.4课题研究的目的与意义3
1.5研究内容和技术路线4
1.5.1研究内容4
1.5.2技术路线4
2实验仪器与实验方法5
2.1实验仪器5
2.2研究方法5
2.2.1研究方案5
2.2.2分析测定方法6
2.2.3数据统计分析方法6
3结果和讨论分析 7
3.1纳米银和银离子对活性污泥MLSS及SVI的影响7
3.2纳米银和银离子对污水中主要污染物的去除性能的影响8
3.2.1纳米银和银离子对活性污泥去除COD的性能影响8
3.2.2纳米银和银离子对活性污泥去除NH4+N的性能影响9
3.2.3纳米银和银离子对活性污泥去除NO2N、NO3N的性能影响10
3.2.4纳米银和银离子对活性污泥去除PO43的性能影响11
4结论12
致谢13参考文献14
纳米银对模拟城市污水生物处理系统处理性能的影响
摘 要
随着纳米银在人类生产生活中得到了广泛应用，由其引起的环境问题也引起了社会的广泛关注。纳米银对生物活性有一定的抑制作用，而污水生物处理是利用微生物的新陈代谢对污水内污染物进行降解和去除，因此纳米银与污水生物处理系统中的活性污泥之间的相互作用会影响到污水生物处理的效果。为了保证污水处理的平稳运行，研究纳米银对污水生物处理系统的影响具有重要的意义。本文人工配置城市 *51今日免费论文网|www.51jrft.com +Q: &351916072& 
污水，构建序批式反应器（Sequencing batch reactors，SBRs），将不同浓度的nAg（0 mg/L、1.0 mg/L、10 mg/L）与Ag+（0 mg/L、0.3 mg/L、3.0 mg/L)加入模拟污水生物处理系统中，探究纳米银对系统处理性能的影响。进水中添加10 mg/L nAg，活性污泥系统的NH4+N去除率与CK相比，降低了30%。不同浓度nAg及Ag+对活性污泥去除COD的性能有显著影响，对NO2—N去除率均无显著影响，对NO3N去除率短期存在差异、长期无显著差异，对PO43 去除率初期无影响、长期影响逐渐加剧。环境中的纳米银浓度远低于本实验中所用纳米银浓度，纳米银的环境效应需要更加细致地研究。
EFFECT OF NANO SILVER ON THE PERFORMANCE OF SIMULATED URBAN SEWAGE BIOLOGICAL TREATMENT SYSTEM
ABSTRACT
In recent years, with the continuous development of nanotechnology, nanosilver has been widely used in human production and life, but at the same time, it caused a lot of environmental problems, which attracted the widespread concern in society. Nanosilver has a certain inhibitory effect on biological activity, and biological treatment of sewage is the use of microbial metabolism to degrade and remove pollutants from sewage, therefore the interaction between nanosilver and activated sludge in the biological treatment system of sewage will affect the effect of biological treatment of sewage. In order to explore the potential toxic effects of nanosilver materials on microorganisms and to ensure the smooth operation of sewage treatment, it is of great significance to comprehensively and in detail study the impact of nanosilver on sewage biological treatment system. In this paper, the simulated urban sewage biological treatment system is exposed to different concentrations of nAg (0mg / L, 1.0mg / L and 10mg / L) and Ag+ (0mg / L, 0.3mg / L and 3.0mg / L) to explore the entire exposure. With the addition of influent into the simulated wastewater biological treatment system, the effect of nanosilver on the treatment performance of the system is investigated. Adding 10 mg / L nAg to the influent reduces the removal rate of NH4+ N of activated sludge system by 30% compared with control check. Different concentrations of nAg and Ag+ have a significant effect on the removal of COD by activated sludge, and have no significant effect on the NO2N content of the effluent of SBRs. The nAg and Ag+ of different concentrations are different in the short term of effluent NO3N concentration, and there is no significant difference in the long term. The nAg and Ag+ of different concentrations have no effect on the PO43 content of effluent in the initial stage, and the longterm effect increases gradually. The concentration of nanosilver in the environment is much lower than that used in this experiment, and the environmental effects of nanosilver need to be studied in more detail.

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