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为了解昆明市主城区排水管道沉积物的性质,调研和采集了居住区、综合服务区、文教区、商业区等不同功能区的排水管道沉积物,分析了沉积物的粒径、密度、有机质(VSS/TSS)和污染物含量等指标,结果表明各功能区沉积物理化性质存在明显差异,粒径大小关系为商业区>文教区>居住区>综合服务区,VSS/TSS的关系为居住区>文教区>商业区>综合服务区,与沉积物干密度呈负相关,与含水率呈正相关;对于COD而言,居住区>文教区>综合服务区>商业区,TN的关系为居住区>文教区>商业区>综合服务区,TP呈现居住区>综合服务区>文教区>商业区的关系,由支管至主干管,沉积物中COD、TN无明显规律,TP略有减小,且TP更易赋存在小颗粒沉积物上;对于重金属而言,商业区污染高于其他3区,沉积物中Cu、Zn、Pb和Cd这4种重金属含量分别是背景值的2.2、4.4、2.5和8.6倍,建议优先控制Cd和Zn.
In order to understand the nature of drainage pipes in the main urban area of Kunming, sediment of drainage pipes in residential areas, integrated service areas, cultural and educational areas and commercial areas were investigated and collected. The sediment particle size, density, (VSS / TSS) and contaminant content. The results showed that there were significant differences in physical and chemical properties of sediments in each functional area. The relationship between size and size was commercial area> cultural and educational area> residential area> comprehensive service area. The relationship between VSS / TSS was residential District> culture and education district> commercial district> comprehensive service area, which is negatively correlated with dry density of sediment and positively correlated with moisture content; for COD, residential area> cultural and educational area> integrated service area> District> culture and education district> commercial district> comprehensive service area, TP showed residential area> comprehensive service area> cultural and educational area> commercial district. There was no obvious regularity of COD and TN in the sediment from branch to main pipe, TP slightly decreased , And TP is more likely to be deposited on small sediments. For heavy metals, the commercial area is polluted more than the other three areas. The contents of Cu, Zn, Pb and Cd in sediments are 2.2, 4.4, 2.5 and 8.6 times, we recommend giving priority to Cd and Zn.