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城镇化和城市化通常是在河流流域内向前推进的,这导致人类活动对河流的污染越来越严重。防治这类河流污染的主要措施是截污沟修建以实现污水、雨水分离。那么截污沟修建后的效能如何?截污沟修建后中心城区水质如何变化?是否真的好转?为了回答这个问题,我们于2008年10月、2009年1月、4月、7月对贵阳市南明河主城区河段的8个断面进行了4次采样,获得了水温(T)、pH、电导(EC)、溶解氧(DO)、主要阳离子(K+、Na+、Ca2+、Mg2+)和主要阴离子(Cl-、NO3-、SO24-、HCO3-)含量的空间变化情况。相对于城区边缘,主城区河段主要离子含量和电导显著性升高,这种升高不是支流汇入的结果,而是人类活动导致。这说明了3种可能性:截污沟收集废水的不完全性、截污沟渗漏的可能性和非点源污染源存在的可能性。水化学分析提供了简单易行的评估截污沟效能的方法。
Urbanization and urbanization are often advanced within river basins, leading to increased river pollution by human activities. The main measure to prevent such river pollution is the construction of sewer ditches to achieve separation of sewage and rainwater. So how is the performance of interception ditch after construction? How to change the water quality after the construction of interception ditch? Is it really better? In order to answer this question, we asked Guiyang in October 2008, January, April and July 2009 The four sections of 8 sections in the main section of Nanming River were sampled and the water temperature (T), pH, electric conductivity (EC), dissolved oxygen (DO), main cations (K +, Na +, Ca2 +, Mg2 +) and main Anion (Cl-, NO3-, SO24-, HCO3-) content of the spatial changes. Relative to the edge of the urban area, the major ion content and conductance of the main urban area reach a significant increase. This increase is not the result of tributary flow in, but is caused by human activities. This shows three possibilities: the incompleteness of sewer collection waste water, the possibility of seepage sewer leakage and the possibility of non-point source pollution. Chemical analysis of water provides a simple and easy way to assess the effectiveness of the sewer.