摘要
基于DLVO胶体稳定理论和分形理论,通过对絮团中颗粒间相互作用的分析,提出了一种计算絮团极限粒径的方法,在此基础上,分析了絮团的受力情况,从微观的角度提出了一种非均匀沙絮凝形成的清浑界面的初始段沉降速度的计算方法.结合直线段、过渡段和压缩段清浑界面的沉降理论,计算了不加絮凝剂、添加50和100mg/L絮凝剂时清浑界面的沉降速度,利用取自黄河花园口的泥沙样品,进行清浑界面的沉降速度验证试验,试验结果和计算结果较为一致.研究成果对黄河等高浊度细颗粒含沙水流的治理与处理有一定的理论和实际应用价值.
A distributed model based on the limiting diameter for setting velocity of superna- rant sediment interface during sludge flocculation is presented. With DLVO and fractal theory, we proposed a new method to calculate the limiting diameter, in which the balance of hydrody- namic shear stress and inner force, including van der wanls attraction and double electrode lay- er repulsions, are used for explaining the stabilization of the limiting diameter. To simulate the settling velocity of interface, we put forward a method to calculate the accelerating section, af ter which the last three sections＇were simulated. The model proposed in this paper were veri- fied using the data observed from the Huayuankou of Yellow River. A comparison between the calculated results and experimental data with the flocculant concentration series 50 and 100 mg/L were performed to verify our simulation technique, and they coincided well with each other.
出处
《中国矿业大学学报》
EI
CAS
CSCD
北大核心
2012年第5期850-856,共7页
Journal of China University of Mining & Technology
基金
国家重点基础研究发展计划(973)项目(2011CB403300)
关键词
清浑界面
沉降速度
絮团
极限粒径
絮凝剂
settling velocity
interfaee
floc
the limiting diameter
flocculant
