【作者】 尹海龙； 徐祖信；

【Author】 YIN Hai-long,XU Zu-xin Key Laboratory of Yangtze River Water Environment,Ministry of Education,Shanghai,China,200092

【机构】 教育部长江水环境重点实验室；

【摘要】 在原水输水管渠中投加粉末活性炭,对污染原水预处理,已经成为水源地突发污染事故条件下的应急处理技术手段。粉末活性炭在长距离输水管渠中的输移特征成为关注的问题。本研究在开展粉末活性炭自凝聚与沉降机制研究的基础上,建立了反映粉末活性炭动态絮凝过程的输移数学模型。以上海市黄浦江上游的原水输水管渠(>40km)为研究对象;在粉末活性炭投加浓度为30～300 mg/L的范围内,模拟了粉末活性炭在输水管渠的沿程浓度分布及作用范围,总结得出粉末活性炭沿输水管渠沉降速率与水流剪切力、起始投加浓度的经验公式。研究表明,当粉末活性炭的投加浓度升高时,由于自絮凝过程导致的沉降速率随之增加,粉末活性炭沿程沉降速率加大。综合考虑粉末活性炭投加成本和其输移范围,认为,单纯增加粉末活性炭投加浓度,并非较好的应急处置方案。后续研究将建立粉炭—微量有机物吸附的水质模型,进一步分析粉末活性炭的适宜浓度范围。更多还原

【Abstract】 In this paper a modeling to predict PAC transport and deposition in the raw water aqueduct with dynamic flocculation is developed,so as to assess PAC deposition effect along the aqueduct with water supply regime.A study domain of the raw water aqueduct about 40 km length initiated with water sources in upstream Huangpu River,Shanghai,China,was presented as an example to display how the model was used to facilitate the computation of PAC variation along the aqueduct.Modeling results suggest that PAC deposits to the water aqueduct approximately at flows below 40.63 m3/s(e.g.65%peak flow),and PAC settling rate(e.g.PAC concentration decrease along the trunk aqueduct reach divided by trunk length) increases with the increase of initial PAC concentration and decrease of fluid shear as a function of power form,which shows that fluid shear stress as well as initial PAC concentration is a substantive source for PAC deposition,due to its small particle diameter.So,to tackle sudden pollutant discharge incident pollution to water sources, increasing initial PAC concentration solely may not be a good option;it is important that a modeling coupling PAC transport with pollutant removal should be conducted to present a rational range of initial PAC concentration for a given water supply flow and potential water sources pollution levels in the next step.更多还原