Bridging Flocculation by Polymers
Bridging Flocculation by Polymers
复制标题
通过聚合物桥接絮凝
DOI：
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发表时间：
2013
期刊：
影响因子：
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通讯作者：
R. Hogg
中科院分区：
文献类型：
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作者：
R. Hogg
对絮凝过程进行了全面评估，重点是物理和工程方面。聚合物桥联絮凝涉及三个基本子过程：聚合物与颗粒悬浮液的混合、聚合物在颗粒表面上的吸附以及絮凝体的形成和生长。其中每一个主要通过悬浮液的搅拌来控制。同时，搅拌也促进絮体破碎。由于聚合物吸附往往不可逆地发生，因此絮凝是一个非平衡过程，子过程的相对速率起着至关重要的作用。回顾了这些过程的动力学，并评估了它们对过程设计的影响。控制相对速率的程序为间歇系统中高效絮凝过程的设计提供了基础。提供了有关扩大规模标准的一些信息。讨论了基本概念对连续过程的设计和操作的扩展。
A comprehensive evaluation of flocculation processes is presented with emphasis on physical and engineering aspects. Flocculation by polymer bridging involves three basic sub-processes: mixing of the polymer with the particle suspension, adsorption of the polymer on particle surfaces and the formation and growth of flocs. Each of these is primarily controlled by agitation of the suspension. At the same time, agitation also promotes floc breakage. Since polymer adsorption tends to occur irreversibly, flocculation is a non-equilibrium process and the relative rates of the sub-processes play a critical role. The kinetics of these processes are reviewed and their implications with respect to process design are evaluated. Procedures for controlling the relative rates are shown to provide a basis for the design of efficient flocculation processes in batch systems. Some information on scale-up criteria is presented. Extension of the basic concepts to the design and operation of continuous processes is discussed.