雨水管道沉积物沉淀特性及主要污染物含量分布  

Sedimentation Characteristics and Pollutant Content Distribution of Storm Drainage Sediments

作　　者：尚宇 周毅[1,2] 廖安意 方正 SHANG Yu;ZHOU Yi;LIAO An-yi;FANG Zheng(School of Civil Engineering,Wuhan University,Wuhan 430072,China;Engineering Research Center of Urban Disasters Prevention and Fire Reseue Technology of Hubei Province,Wuhan 430072,China)

机构地区：[1]武汉大学土木建筑工程学院,武汉430072 [2]湖北省城市综合防灾与消防救援工程技术研究中心,武汉430072

出　　处：《环境科学》2018年第8期3696-3703,共8页Environmental Science

基　　金：国家水体污染控制与治理科技重大专项(2014ZX07104-005);广东省水利科技创新项目(2017-33)

摘　　要：为研究雨水管道沉积物的沉淀特性和污染物含量特征,在武汉市对建筑(包括住宅小区)、道路和绿地3种用地类型的雨水管道沉积物进行采样和分析.沉速测试结果表明,高沉速颗粒在沉积物中所占比例较大,建筑和道路中沉积物的沉速分布相对稳定,建筑、道路和绿地中沉速大于3.00 cm·s-1的颗粒占比依次递减.粒径分析结果显示,沉积物粒径分布范围较广,大多集中在13~628μm范围内,且同种用地类型沉积物粒径分布差别很大.按沉降速度将每份沉积物样品分为7组,分析化学需氧量(COD)、总氮(TN)和总磷(TP)含量与沉降速度之间的联系.结果表明,沉速大于3.00 cm·s-1和小于0.025cm·s-1的沉积物中污染物含量较低,但高沉速沉积物中污染物总量较多.对沉积物样品整体而言,各用地类型COD含量从高到低依次为:绿地>道路>建筑;道路雨水管道沉积物中氮含量较低,其余两种用地中含量接近;建筑区雨水管道沉积物中磷含量较高,其余两种用地中含量接近;COD∶TN在(51~89)∶1之间,COD∶TP的值在(102~186)∶1之间.To determine the characteristics of precipitation and pollutant content in storm drainage sediments, samples of sediment from building areas （including residential areas） , roads, and green spaces in Wuhan were collected and analyzed. The settling velocity results show that particles with high settling velocity weight occupied a larger proportion in the sediment; the settling velocity distribution of sediments in building areas and roads was more stable than that in green spaces; and the proportion of particles with settling velocity over 3.00 cm· s -1 in building areas, roads, and green spaces decreased in turn. The particle size distribution indicated sediment size had a wide variation range, with most particles concentrated in the range 13-628 μm, and that the particle size distribution in sediment from the same land type could differ greatly. Each sample was divided into seven groups according to settling velocity. The contents of chemical oxygen demand （COD） , total nitrogen （TN） , and total phosphorus （TP） were tested. The results indicate that pollutant contents in groups containing particles with settling velocity over 3.00 cm·s -1 or below 0. 025 cm· s -1 were lower than those in other groups. Most pollutants were concentrated in particles with high settling velocity. The COD concentration declined in green spaces, roads, and building areas, in turn, for most cases. The nitrogen content in the drainage sediment of roads was lower than those in the two other kinds of land, whereas the phosphorus content in the drainage sediment of building areas was higher than those in the two other kinds of land. In the storm drainage sediment, the ratio of COD： TN was between （51-89） ： 1 and that of COD： TP was between （102-186）： 1.

关 键 词：雨水管道 沉积物 沉降速度 粒径分布 污染物含量 

分 类 号：X52[环境科学与工程—环境工程]