城市排水系统沉积物特性及清淤方式研究进展

存在于排水系统中的沉积物随排水进入受纳水体后,将严重污染水体的水质;同时也对排水系统的的管理和运行带来许多问题。该文综述了我国部分城市的排水管道沉积物的沉积状况,重点阐述了沉积物的来源和组成,沉积物的颗粒粒径、有机物含量(VSS/SS)、颗粒粘性和颗粒密度等物化性质,以及附着于沉积物上的金属污染物的相关特征。其粒度分布范围是D10为1.89-223.21μm,D50为12.38-437.30μm,D90为39.06-1572.52μm;VSS/SS的范围是1%-38%;密度范围是1.80-2.47g/cm3。金属污染物主要的附着对象是沉积物中的细小颗粒如生物膜上。该文还介绍了排水管道和雨水调蓄池中常用的清淤方式。

Study on Characteristics of Sediments in Urban Sewer System and Its Desilting Mode

The sediments in urban sewer systems will seriously pollute the water quality after it comes into the receiving water with the drainage,and at the same time,will bring many problems to the management and operation of sewer system.This paper summarizes the situation of sewer sediments in some cities of China,focuses setting forth on the source and components of sediments,its particle sizes,organics content(VSS/SS),particle viscosity and particle density etc.as well as the relevant characteristics of metal pollutants adhering to sediments.Its particle size distribution range is that D10 1.89μm ~ 223.21μm,D50 is 12.38μm ~ 437.30μm,D90 is 39.06μm ~ 1572.52μm,VSS/SS is 1% ~ 38% and the density is 1.80 ~ 2.47g/cm3.The metal pollutants mostly adhere to fine particles such as bio-film in sediments.The paper introduces the common desilting methods in sewers and rainwater storage tanks.