重庆市主城区排水管道沉积物性质研究

Study on characteristics of sewer sediments in a mountainous city

为了解重庆市主城区排水管道沉积物的性质,调研和采集了生活区、交通区、文教区、商业广场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、有机物含量(VSS/TSS)和污染物含量等指标,研究了不同功能区沉积物的差异.结果表明:不同功能区排水管道沉积有不同的理化性质,沉积物的粒径,交通区>文教区>商业广场>居住区.沉积物的密度与有机物含量(VSS/TSS)呈负相关(R2=0.998).沉积物污染物含量空间分异性显著,COD含量,文教区>居住区>商业广场>交通区.TN和TP含量,文教区>商业广场>居住区>交通区,与街尘相比,TP呈现显著富集特点.对于重金属含量,交通区显著高于其他3个功能区,Cu、Zn、Pb、Cd最大值分别为303.5、539、104、1.14mg/kg.

In order to get the characteristics of the sewer sediments in a mountainous city, the sewer sediments in Chongqing urban zones were selected. There were different characteristics for the sediments located in different areas. The size of the sediments was traffic area 〉cultural district〉 business forum 〉residential area. The density and sediment organic content（VSS/TSS） were positively correlated（R^2 = 0.998）. The content of sediment showed significantly differences in different functional areas. The size of COD was cultural district residential area 〉business forum 〉traffic area. The sizes of TN and TP were cultural district 〉business forum〉 residential area 〉traffic area. The content of TP, which was compared with street dust, showed significantly enrichment characteristic. The content of heavy metals in traffic area was the biggest in all functional areas, and the max value of Cu、Zn、Pb、Cd was 303.5、539、104、1.14mg/kg respectively.