磁场对短程硝化-反硝化工艺运行效果的影响

摘要：短程硝化是一种具有创新意义的生物脱氮工艺，它具有节约成本、工艺流程简单等优点，而合适的磁场已被证明能够强化微生物活性、促进生物脱氮效率。本实验分别在有/无磁场条件下，运行两个短程硝化-反硝化SBR反应器，通过对两个反应器进出水中污染物浓度进行定期监测，分析磁场对反应器污染物去除效果的影响；同时定期进行反应器周期性采样实验，测定运行周期内反应器污染物浓度变化，分析磁场对短程硝化污水生物处理工艺的影响过程；对反应器内污泥胞外聚合物进行提取并定量分析，初步解析磁场对短程硝化过程的影响机理。实验结果表明，磁场作用下，短程硝化工艺能够更快的实现，其亚硝酸盐积累率更高。稳定运行期磁场作用提高了污水脱氮效率。此外，磁场能增强酶活性，提高反应速率,还能促进活性污泥胞外聚合物的分泌，促进微生物的生长和代谢。70716

毕业论文关键词：生物脱氮；SBR；磁场；短程硝化

The Effect of Magnetic Field on the Shortcut Nitrification - denitrification Process

Abstract: Short-cut nitrification process is an advanced bilogical nitrogen removal process due to its advantages of low cost and simple process. Appropriate magnetic field has been proved to enhance the activities of microbies and improve the biological nitrogen removal efficiency. In the present study, two SBRs with or without magnetic fields were conducted to achieve the shortcut nitrification process. The impacts of magnetic fields on the performances of the SBRs were determined by monitoring the influent and effluent nitrogen concentrations. Meanwhile, the transformantion of nitrogen during the running cycle of the reactors were also analyzed to investigate the impacts of magnetic fields on nitrogen removal process. In addition, the extracellular polymeric substance (EPS) of the sludge in both reactors were extracted and analyzed, to analyze the influnce mechanisms of magnetic fields. The results showed that the magnetic fields could shorten the startup period of shortcut nitrification process, and enhance the nitrite accumulation rate. The nitrogen removal efficiency was improved by the magnetic fields during the stable running period. In addition, the magnetic fields could improve the activaties of microbes, and could enhance the production od EPS.

Keywords: Biological nitrogen removal; SBR; Magnetic field; Shortcut nitrification

1.前言 1

1.1研究背景 1

1.2研究目的及意义 2

2.实验材料与方法 2

2.1实验装置 2

2.2接种污泥与实验用水 3

2.3实验内容 4

2.4分析方法 4

2.4.1 常规水质指标的监测 4

2.4.2 污泥胞外聚合物的监测 5

3.实验结果 7

3.1不同反应器污水处理效果分析 7

3.2不同反应器污染物周期变化过程分析 8

3.3不同反应器胞外聚合物组成分析 10

4.结论与展望 10

4.1结论 10

4.2 展望 11

5. 参考文献 11

磁场对短程硝化-反硝化工艺运行效果的影响

1.前言

1.1研究背景磁场对短程硝化-反硝化工艺运行效果的影响:http://www.youerw.com/huaxue/lunwen_80169.html