污水泵站恶臭气体扩散规律研究

发布时间：2018-05-03 00:14

本文选题：恶臭 + H_2S　；参考：《南京师范大学》2017年硕士论文

【摘要】：在密闭的城市污水排水管道中,一些物质发生化学反应使得污水泵站在运行中产生恶臭气体,严重时会影响周边居民生活环境质量。如今,人们的公共环境意识越来越强,污水泵站的恶臭问题日益得到重视。本课题选取常州市某污水泵站为研究对象,探讨污水泵站中恶臭气体的扩散规律,为治理同类型的污水泵站提供理论基础。本课题首先简要介绍了恶臭的分类、危害以及相关的法律法规;之后分析污水泵站污染物浓度现场实测数据,得出污染物扩散规律;然后运用模拟软件对污水泵站原有除臭系统下恶臭扩散分布进行模拟,分析模拟结果,对除臭系统进行必要的调整优化;最后运用Screen3计算该污水泵站厂界浓度、大气环境防护距离以及卫生防护距离,分析泵站对厂界环境的影响。本文通过研究污水泵站主要恶臭污染物H_2S的扩散分布情况来研究恶臭的分布扩散规律,最终得出以下结论:1、分析实测数据得出:夏季温度较高时,污水泵站排放更多的恶臭气体;恶臭气体扩散量与污水量、污水流速成正比;不同的气流组织结构影响恶臭气体的扩散;2、现有除臭系统存在格栅处污染气体浓度较高,新风稀释能力低,恶臭气体无法及时排出的问题;3、调整后的除臭系统增强了抑制恶臭气体扩散的能力和新风稀释恶臭气体的能力,可明显改善工作环境,且对污染物源强较大的情况可起到更加有效的控制效果;4、该污水泵站厂界污染物排放执行二级标准,但计算结果显示下风向恶臭污染物最大落地点在13m处,可将最小厂界距离扩大至13m;5、位于污水泵站西北方向的居民区与泵站最短距离超过大气防护距离,但小于卫生防护距离;6、污水泵站废气排放口位于东南向,西北风可抑制恶臭气体向西北方向扩散,考虑到常州年主导风向为西北风,建议污水泵站管理用房建在泵站西北方向。
[Abstract]:In the closed sewer pipe, chemical reaction of some substances makes the sewage pumping station produce stench gas in operation, which will seriously affect the living environment quality of the surrounding residents. Nowadays, people's public environmental consciousness is stronger and more and more attention is paid to the stench problem of sewage pumping station. In this paper, a sewage pumping station in Changzhou City is selected as the research object, and the diffusion law of odor gas in the sewage pumping station is discussed, which provides a theoretical basis for the treatment of the same type sewage pumping station. Firstly, the classification, harm and related laws and regulations of odor are briefly introduced, and then the field measured data of pollutant concentration in sewage pump station are analyzed, and the diffusion law of pollutants is obtained. Then the distribution of stench diffusion under the original deodorization system of the sewage pump station is simulated by using the simulation software, and the simulation results are analyzed, and the necessary adjustment and optimization of the deodorization system are carried out. Finally, the boundary concentration of the sewage pumping station is calculated by using Screen3. Air environmental protection distance and sanitary protection distance are analyzed, and the influence of pump station on plant boundary environment is analyzed. In this paper, by studying the distribution of the main malodorous pollutant H2S in the sewage pump station, the distribution and diffusion law of the malodorous pollutant is studied. Finally, the following conclusion is drawn: 1. By analyzing the measured data, it is concluded that when the temperature is high in summer, More odor gases are discharged from sewage pumping stations; the amount of odor gas diffusing is proportional to the amount of sewage water and the flow rate of sewage is proportional to the flow rate of sewage; different airflow organization structure affects the diffusion of stench gas and the existing deodorization system has a high concentration of polluted gas at the grid. The low dilution capacity of fresh air and the problem that the odor gas cannot be discharged in time. The adjusted deodorization system enhances the ability to restrain the diffusion of the odor gas and the ability of the fresh air to dilute the odor gas, which can obviously improve the working environment. Moreover, the more effective control effect can be obtained for the situation where the pollutant source is larger. The discharge of pollutants in the boundary of the sewage pump station is carried out in the second class standard. However, the calculation results show that the maximum location of the downwind malodorous pollutants is at 13m. The minimum factory boundary distance can be extended to 13mt0. The shortest distance between residential area and pumping station located in the northwest direction of sewage pumping station exceeds the air protection distance, but less than that of sanitary protection. The exhaust gas outlet of the sewage pumping station is located in the southeast direction. The northwest wind can restrain the malodorous gas from spreading to the northwest. Considering that the main wind direction in Changzhou is the northwest wind, it is suggested that the management room of the sewage pumping station should be built in the northwest direction of the pumping station.
【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：X512;TU992.25

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