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題 名 | Transient Behavior of Polymer-Induced Flocculation: Effect of Dosing Mechanism=高分子誘發之絮聚現象: 助凝劑加入方式的影響 |
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作 者 | 徐治平; 林德波; | 書刊名 | Journal of the Chinese Institute of Chemical Engineers |
卷 期 | 29:3 1998.05[民87.05] |
頁 次 | 頁219-228 |
分類號 | 467 |
關鍵詞 | 高分子; 誘發; 絮聚現象; 助凝劑; 加入方式; Flocculation; Adsorption of polymer; Dosing mechanism; Floc size distribution; Collision efficiency; Transient behavior; |
語 文 | 英文(English) |
中文摘要 | 本文探討由高分子所誘發之非穩態膠體絮聚現象,特別針對高分子助凝劑的加入 方式對於整個操作的影響。我們考慮兩種方式:括連續性的加入與間歇性的加入。數值模擬 的結果顯示, 對於前者而言,助凝劑加入的時間愈長,碰撞效率 E 對時間變化的分佈愈廣 ;這有利於膠羽的形成。一般而言,以間歇性方式加入助凝劑時的分佈較以連續方式加入者 為廣。前者所得的平均膠羽粒徑較後者為大。如果加入助凝劑的總劑量固定,以連續方式加 入遠優於於開始時一次加入。不過,如果絮聚對於表面積覆蓋率的影響可以忽略,則有相反 的趨勢。 |
英文摘要 | The aggregation of dispersed colloidal particles induced by the introduction of polymer is modeled theoretically. In particular, the effect of the dosing mechanism of polymer on the transient behavior of the system under consideration is examined. Both continuous dosing in a certain time interval and intermittent dosing mechanisms are considered. We conclude that the longer the dosing period for the former, the broader the distribution of collision efficiency E as a function of time. This is advantageous to floc formation. The distribution of E for the case of an intermittent dosing is broader than that for the case of a continuous dosing. The former yields a larger mean floc size. For a fixed amount of polymer added, a continuous dosing is superior than an impulse dosing initially. However, if the contribution of aggregation to the mean fractional surface coverage of particles is negligible, the reverse is true. |
本系統中英文摘要資訊取自各篇刊載內容。