山地城市合流污水特细砂粒径特征及分布  

Characteristics and disturbution of ultra-fine grit in combined sewer system of moutainous urban

作　　者：何强[1] 胡澄[1] 徐志恒 李华 

机构地区：[1]重庆大学三峡库区生态环境教育部重点实验室,重庆400045 [2]中铁四院昆明楚云交通工程设计有限公司,昆明650214 [3]重庆水务集团股份有限公司涪陵污水处理厂,重庆408000

出　　处：《环境工程学报》2013年第1期72-78,共7页Chinese Journal of Environmental Engineering

基　　金：国家"水体污染控制与治理"科技重大专项(2008ZX07315-003)

摘　　要：对山地城市合流污水特细砂粒径特征参数及分布研究的结果表明,晴、雨天合流污水细砂平均粒径D(3,4)均小于250μm,且含量高,属于特细砂;新旧城区排水体制、山地地貌、降雨强度、雨前晴天数、用地性质、水土流失等因素均会对山地城市合流污水特细砂粒径特征和分布等造成影响。涪陵污水处理厂进水含砂量高达183.9 mg/L,平均粒径为182.6μm,粒径偏小,超出沉砂池有效去除范围;大量特细砂进入曝气池后,堵塞管道、磨损设备等,给污水处理厂运行带来一系列不利影响。The study on the particle size distribution, feature parameters of ultra-fine grit in combines sewer system of mourainous urban in Three Gorges Reserboir Region was processed. The results show that the average particle size of grit is less than 250 μm in combines sewer system of Fuling area in dry-weather and wet-weather. It is belong to ultra-fine grit. The characteristics and gradation of ultra-fine grit vary depending on a number of factors. These include the type of collection system （ combined or separate） , the physical condition, mountain landscape, rainfall intensity, dry days before rain, the primary activities （ commercial, residential, etc） and soil and water loss etc. The ultra-fine grit content is up to 183.9 mg/L and the average particle size is only 182.6 μm in influent of Fuling Wastewater Treatment Plant. The ultra-fine grit is too fine to be removed by grit trap. When lots of ultra-fine grit into the aeration tank,it brings a series of operational issues such as attrition of pump and mechanical equipment, blockages resulting from grit deposition etc.

关 键 词：山地城市 合流制 特细砂 粒径分布 

分 类 号：X703[环境科学与工程—环境工程]