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Hydrodynamic Unit Processes Involved in the Transportation of Flocculated Suspension

絮凝悬浮液输送涉及的水动力单元过程

基本信息

批准号：
05806031
负责人：
ADACHI Yasuhisa
金额：
$ 1.28万
依托单位：
University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1995
项目状态：
已结题

项目摘要

The transport phenomena of the flocculated suspension has been studied from many viewpoints of practical applications such as solid-liquid separation in the water and wastewater treatments. However, most of the previous investigation has been conducted without definite characterization of the physicochemical properties of used materials which form flocs and hydrodynamic condition of the suspension which surrounds flocs. In the present investigation, series of analyzes into the unit hydrodynamic processes involved in the transportation of flocculated suspension ; the kinetics of flocculation, the sedimentation of a single floc and the rheology of flocculated suspension have been carried out using flocs formed with well-characterized colloidal material in terms of flocculation. The obtained results are summarized as follows :(1) The rate of coagulation was analyzed with an assumption of simple additivity of orthokinetics and perikinetics. The experimental results demonstrated that this a … More ssumption can be used in the practical sense. In addition, the applied mixing oparation was standardized in terms of collision rate between colloidal particle.(2) The standardized mixing opation was applied to analyze the kinetics of bridging flocculation. It was found that the conformation of polymer in the solution state has a direct influence on the rate of bridging flocculation. Consistent result with a picture of kinetically controlled polymer adsorption was also obtained.(3) The sedimentation velocity of a formed floc was measured as a function of floc diameter. The result confirmed the validity of computer simulation to predict the scaling studture of a floc. It was demonstrated that the reported result by Tambo on the settling velocity of a floc is quantitatively misleading.(4) The viscosity of Na-montmorillonite suspension was analyzed flocculated under alkaine condition. It was clarified that the effect of hydrodynamic interaction is significant even in the dilute limit and taht the state of hydration is a important factor to predict the transpor properties of the suspension. Less

絮凝悬浮液的输运现象已从水和废水处理中的固液分离等实际应用的许多观点进行了研究。然而，大多数以前的调查已经进行了没有明确的表征所使用的材料，形成絮凝物和悬浮液的流体动力学条件的絮凝物周围的物理化学性质。在目前的调查中，一系列的分析到单位的水动力学过程中所涉及的运输絮凝悬浮液，絮凝动力学，一个单一的絮凝体的沉降和絮凝悬浮液的流变学进行了使用絮体形成的良好特征的胶体材料在絮凝方面。主要研究结果如下：（1）采用正向动力学和周向动力学简单加和的假设，对混凝速率进行分析。实验结果表明，这是一个 ...更多信息可以在实际意义上使用sumption。此外，还根据胶体颗粒之间的碰撞率对所采用的混合操作进行了标准化。(2)采用标准化混合操作对架桥絮凝动力学进行了分析。结果表明，聚合物在溶液状态下的构象对架桥絮凝的速度有直接影响。还获得了与动力学控制的聚合物吸附的图片一致的结果。(3)测量了形成的絮凝体的沉降速度作为絮凝体直径的函数。实验结果证实了计算机模拟预测絮体结垢规律的有效性。结果表明，Tambo关于絮凝物沉降速度的报告结果在定量上是误导的。(4)分析了钠基蒙脱土悬浮液在碱性条件下絮凝的粘度。结果表明，水动力相互作用的影响即使在稀限下也是显著的，水化状态是预测悬浮液输送特性的一个重要因素。少