给水管网生长环特征重金属释放及对水质影响研究

发布时间：2018-01-11 02:27

本文关键词：给水管网生长环特征重金属释放及对水质影响研究　出处：《华侨大学》2013年硕士论文　论文类型：学位论文

【摘要】：饮用水安全保障技术一直是社会关注的热点之一。近年来，给水管网中重金属对水质的影响逐渐引起国际范围的广泛关注。国家“十一五”、“十二五”重大水专项中，针对饮用水中重金属污染的控制技术进行了强调。城市给水管网结构的复杂性以及给水管网生长环引起的重金属释放，涉及饮用水的水质安全。基于先进的GIS技术研究城市给水管网水质变化，重金属的释放规律，对保障城市供水安全有重要意义。给水管线属性资料和空间数据是给水管网管理的关键点和难点之一。本论文针对某市A区域给水管网管线进行了基础性的普查工作，完善了该区的给水管线数据库，并结合GIS开发平台进行了二次开发，进一步建立了A区域给水管网信息管理系统。首先对给水管线信息系统的总体框架进行需求性分析，对其功能模块进行设计，，选择ArcGIS Engine作为二次开发平台。进行管线的普查的外业数据采集和内业资料整理，采用ArcGIS中的Access模型对数据进行组织管理，建立数据库，实现管网图形和属性信息存储的一体化。最后，通过整合数据和二次开发实现管线信息系统的管理功能。基于A区域给水管线信息系统的给水管网图层选取具有代表性的供水路径，并查询该供水路径的管线属性信息，在此基础上设置代表性管网采样点进行给水管网新旧路线现场采样，通过现场实验和小试实验，对该片区内的给水管网水质变化规律、管道内重金属的释放及其影响因素进行了研究。研究结果表明随着供水路线的延长，各个水质指标都有上升的趋势，其中重金属砷浓度达到100μg/L，污染现象较严重。通过对该片区管网生长环的结构成分分析，得出生长环主要构成疏松层，后沉淀层，腐蚀层三种结构，其中的铁、锌、铅含量较高。查阅大量文献选取对管网中重金属释放影响最为显著的影响因素进行研究分析。实验结果表明，管道中的重金属的释放量与停留时间、水中的氯离子含量、硫酸根离子含量、管道的流速呈现正相关关系，与pH值的变化关系较为复杂；当管道中水流速度达1.0~1.3m/s及以上时，出现明显的重金属释放现象。各种重金属中，砷与铁的净释放程度成正相关关系。通过对研究结果的分析，最终提出给水管网的运行条件控制以及控制重金属污染的建议。
[Abstract]:In recent years, the influence of heavy metals in water distribution network on water quality has gradually aroused widespread concern in the international scope. In the "12th Five-Year Plan" major water project, the control technology of heavy metal pollution in drinking water is emphasized. The complexity of urban water supply network structure and the heavy metal release caused by water supply network growth ring are emphasized. Based on the advanced GIS technology, it is of great significance to study the changes of water quality and the release of heavy metals in urban water supply networks. Attribute data and spatial data of water supply pipeline line are the key points and difficulties of water supply network management. In this paper, the basic survey work of water supply network pipeline in A area of a city has been carried out. The database of water supply line in this area is perfected, and the secondary development is carried out on the basis of GIS development platform. The information management system of A area water supply network is further established. Firstly, the overall framework of the water supply line information system is analyzed, and its function module is designed. ArcGIS Engine is chosen as the secondary development platform to collect the data from the field and collate the data of the internal industry in the pipeline survey. The Access model in ArcGIS is used to organize and manage the data, establish the database, and realize the integration of pipeline network graphics and attribute information storage. Finally. The management function of pipeline information system is realized by integrating data and secondary development. The typical water supply path is selected based on the A area water supply pipeline information system, and the pipeline attribute information of the water supply path is queried. On the basis of this, the representative sampling points are set up to sample the new and old routes of the water distribution network on the spot. Through the field experiments and small scale experiments, the water quality of the water distribution network in this area is changed. The release of heavy metals in the pipeline and its influencing factors were studied. The results showed that with the extension of the water supply route, the water quality indexes had an upward trend, and the arsenic concentration of heavy metals reached 100 渭 g / L. The pollution phenomenon is serious. By analyzing the structure composition of the growth ring of the region pipe network, it is concluded that the growth ring mainly consists of loose layer, post-precipitation layer and corrosion layer, among which iron and zinc. A large number of literatures were consulted to select the most significant influence factors on heavy metal release in pipeline network. The experimental results showed that the release of heavy metals and residence time in pipeline. The content of chloride ion, sulfate ion content and the flow rate of the pipe show a positive correlation, and the relationship with the pH value is more complex. When the flow velocity in the pipeline reaches 1.0 ~ 1.3 m / s and above, there is a significant release of heavy metals, especially in all kinds of heavy metals. There is a positive correlation between the net release of arsenic and iron. Through the analysis of the results of the study, the control of the operating conditions of the water supply network and the suggestions for controlling heavy metal pollution are put forward.
【学位授予单位】：华侨大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU991.21

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