株洲市雨水管道沉积物-水界面污染物交换特性

Pollutants exchange characteristics of sediment-water interface in Zhuzhou rainwater pipeline

为了解株洲市雨水管道沉积物-水界面污染物的交换规律,分析了沉积物中NH_(4)^(+)-N、SCOD、TP的含量及微生物种群的结构,探讨了溶解氧、温度、水力扰动和微生物种类等环境因素对污染物交换特性的影响。结果表明:沉积物中NH_(4)^(+)-N、SCOD和TP的质量分数分别为20.41、2154.99和1200.86 mg∙kg^(−1);微生物以兼性厌氧菌为主,优势菌属为氨化、反硝化及聚磷功能菌属;溶解氧的降低、温度和扰动强度的升高,均可促使污染物交换通量的升高;氮类物质交换特性受环境因素改变的影响较大。在环境温度为25℃、扰动强度为300 r∙min^(−1)时,NH_(4)^(+)-N交换通量为1.630 mg∙(m^(2)∙h)^(−1)、SCOD为36.218 mg∙(m^(2)∙h)^(−1)、DTP为0.049 mg∙(m^(2)∙h)^(−1)。以上研究结果可为株洲市雨水管道沉积物污染控制提供参考。

In order to investigate the exchange characteristics of pollutants at the sediment-water interface in Zhuzhou rainwater pipeline,the contents of NH_(4)^(+)-N,SCOD,TP and the microbial population structure in the sediments were analyzed.The effects of dissolved oxygen,temperature,disturbance and microbial on pollutant exchange flux were discussed.The results showed that the contents of NH_(4)^(+)-N,SCOD and TP were 20.41,2154.99 and 1200.86 mg∙kg^(−1),respectively.The predominant bacteria were ammonifying,denitrifying and phosphorus-accumulating functional bacteria.The decrease of dissolved oxygen,the increase of temperature and disturbance intensity could lead to the increase of pollutant exchange flux.The exchange characteristics of nitrogen were greatly affected by environmental factors.At 25℃and 300 r∙min^(−1),NH_(4)^(+)-N exchange flux was 1.630 mg∙(m^(2)∙h)^(−1),SCOD was 36.218 mg∙(m^(2)∙h)^(−1),and DTP was 0.049 mg∙(m^(2)∙h)^(−1).The research results can provide reference for sediment pollution control in Zhuzhou rainwater pipelines.