村落无序排放污水污染特征及其影响因素解析

发布时间：2018-03-17 03:11

本文选题：村落降雨径流　切入点：污染特征　出处：《东南大学》2015年硕士论文　论文类型：学位论文

【摘要】：村落无序排放污水对受纳水体造成的污染越来越受到人们重视,为给村落无序排放污水控制技术提供理论基础,将探讨村落无序排放污水污染特征及其影响因素。本研究主要针对丁蜀镇典型村落屋面、庭院、道路和自留地四种下垫面降雨径流中污染物浓度进行监测、分析和研究,并结合周铁镇典型村落研究数据,考察村落无序排放污水污染特征及其影响因素。选取一块具有代表性的汇水区为研究对象,构建了研究区域基于SWMM模型的降雨径流面源污染的水质水量模型。最后考察村落降雨径流对一处受纳水体的影响。主要结论如下：(1)在4种下垫面条件下,自留地的各污染物事件平均浓度值都最高,其SS、COD、TN、TP事件平均浓度分别为373.21mg/L、84.65mg/L、8.94mg/L、2.48mg/L,降雨量、最大降雨强度、前期晴天数和下垫面都是影响村落降雨径流水质EMC值的重要因素。村落降雨径流的氮磷分布中,TN是溶解态为主；TP以颗粒态为主。村落降雨径流整体上存在中度初期冲刷效应,初期冲刷程度与降雨量、最大降雨强度、前期晴天数和下垫面有关。(2)2014年进入该受纳水体的SS、COD、TN、 TP污染负荷分别约为104.6kg、35.3kg、3.2kg, 0.47kg。降雨径流对受纳水体水质产生明显的影响,降雨后,受纳水体污染物浓度升高41.7%～155.6%,其中SS升高最明显。(3)根据降雨监测的水量、水质数据率定了SWMM模型的水文、水力参数和水质参数,包括子集水区漫流宽度、曼宁系数、累计模型和冲刷模型等参数,构建了基于SWMM模型的村落降雨径流水质水量模型。模型校验结果表明：SWMM模型在此类村落小区域的降雨径流水量、水质模拟NS效率系数都处于0.36到0.75之间,可认为模拟结果令人满意。
[Abstract]:People pay more and more attention to the pollution caused by the disorderly discharge of village sewage to the receiving water, which provides a theoretical basis for the control technology of village disorderly discharge of sewage. The pollution characteristics and influencing factors of disorderly discharge of sewage from villages will be discussed. In this study, the concentration of pollutants in rainfall runoff of typical villages in Dingshu town was monitored, analyzed and studied, including roof, courtyard, road and self-reserved land. Combined with the research data of typical villages in Zhoutiezhen, the characteristics and influencing factors of disorderly sewage discharge in villages were investigated. A representative catchment area was selected as the research object. A water quality and quantity model based on SWMM model for rainfall runoff non-point source pollution was constructed. Finally, the effects of village rainfall runoff on a receiving water body were investigated. The main conclusions are as follows: 1) under four underlying surface conditions, The average concentration of each pollutant event in the self-retained area was the highest, and the average concentration of the SSO / COD / TNTP event was 373.21 mg / L = 84.65 mg / L = 8.94 mg / L = 2.48 mg / L, rainfall, maximum rainfall intensity, respectively. The number of sunny days and the underlying surface are the important factors that affect the EMC value of the village rainfall runoff. In the distribution of nitrogen and phosphorus in the village rainfall runoff, the TN is mainly dissolved and the TP is mainly granular. There is a moderate initial scour effect in the village rainfall runoff as a whole. The initial scour degree is related to the rainfall, the maximum rainfall intensity, the number of sunny days in the early period and the underlying surface. (2) on 2014, the SS CODN entered the water body, the TP pollution load was about 104.6 kg ~ 35.3 kg ~ (3.2 kg) and 0.47 kg 路g ~ (2), respectively. The rainfall runoff had a significant effect on the water quality of the receiving water, and after the rainfall, The concentration of pollutants in the receiving water was increased by 41.7 and 155.6, of which SS was the most obvious.) according to the quantity monitored by rainfall, the water quality data rate determined the hydrological, hydraulic and water quality parameters of the SWMM model, including the overflow width of the sub-catchment area, Manning coefficient, The accumulative model and scour model are used to construct the village rainfall runoff water quantity model based on SWMM model. The NS efficiency coefficient of water quality simulation is between 0.36 and 0.75, which can be considered as satisfactory.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X703;X52

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