• 作者： Hsu, Jyh-Ping; Lin, Der-Po
• 中文摘要： 在探討受高分子所引發的絮聚現象時,傳統分析皆假設高分子對膠體粒子之吸附速率比膠體粒子間之碰撞速率快得多。換言之,絮聚在吸附未達穩態前可以忽略。本文中探討了當該假設不成立時膠體粒子之碰撞效率的時變關係。數量級上的分析顯示,傳統分析中的假設在一般條件下是不切實際的。我們發現,碰撞效率與粒子表面上之總吸附位置數與高分子分子數之比值有密切的關係。視該比值之大小,傳統方法將低估或高估碰撞效率。因此,在評估受高分子所引發的絮聚中之碰撞效率時必須謹慎。
• 英文摘要： The fundamental assumption of the collision efficiency analysis for a polymer induced flocculation is that the rate of adsorption of polymer molecules on the surfaces of colloid particles is much faster than the rate of flocculation. In other words, the flocculation process does not start until the adsorption process reaches equilibrium. On the basis of a dynamic analysis, we have examined the temporal variation of the mean collision efficiency. An order of magnitude analysis reveals that the assumption made in the conventional collision efficiency analysis is unrealistic. Depending on the ratio (total number of sites on the surfaces of particles/number of polymer molecules) and the relative magnitude of the adsorption rate constant and desorption rate constant, the collision efficiency calculated by the conventional analysis may be either underestimated or overestimated. Thus, care must be taken in predicting the rate of polymer induced flocculation through the collision efficiency approach.
• 中文關鍵字： 碰撞效率; 高分子; 吸附; 絮凝; 膠體
• 英文關鍵字： Collision Efficiency; Adsorption; Polymer; Flocculation; Colloid