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題名 | 以實驗設計法比較鐵鹽對高、低濁度混凝去除之影響=The Comparison of Igh/Low Turbidity Removal by Ferric Salt Using Experimental Design |
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作者姓名(中文) | 賴文亮; 邱俊彥; 周瑋陞; 吳鴻祥; 周曉莉; 謝玉蓮; | 書刊名 | 大仁學報 |
卷期 | 18 2000.05[民89.05] |
頁次 | 頁145-157 |
分類號 | 445.462 |
關鍵詞 | 2[fee2]部分因素法; 中心組合法; 核心; 2[fee2]Fractional factorial design; Central composition design; Nucleus; |
語文 | 中文(Chinese) |
中文摘要 | 在傳統的水處理廠中常以瓶杯試驗決定最佳之混凝劑量及pH值,然由文獻得知,攪拌強度及時間等物理參數也有某程度之影響,故對實廠操作說言,一套快速及有效之評估方法更突顯其重要。故本研究擬利用2K部分因素法(2k Fractional Factorial Design)找出攪拌速度、時間、鐵鹽劑量及pH值等參數,在配製原水高、低濁度下,決定混凝去除濁度最重要之參數,並再利用中心組合法(Central Composition Design)找出最佳混凝去濁度之操作範圍。 依部分因素法分析發,高、低之kaolin濃度之實驗配製水樣,兩者主要均受混凝劑量及pH之影響,對於高kaolin濃度之水樣而言,濁度去除率與混凝劑量呈負相關,與pH值呈正相關;至於低kaolin之水樣,混凝劑量與pH兩參數對濁度去除率之相關性恰與高濁度相反。 對於高、低kaolin濁度之水樣,以鐵鹽混凝去除濁度最佳之操作範圍,依中心組合法得知均有兩個區域,前者之pH及混凝劑量分別為9.2~10、4.9~6.8及15~30 mg/L及85 mg/L以上,而後者之pH及混凝劑量分別為8.05~9.8、4.3~5.2及2~26 mg/L及74~90 mg/L。至於兩配製原水在其它pH及混凝劑量下,高濁度原水之濁度去除率較底濁度高出約7~10%,顯示高濁度可充分提供鐵鹽形成鐵之氫氧化物所需之核心(nucleus),故其濁度去除明顯優於低濁度原水。 |
英文摘要 | The optimum operation conditions in conventional coagulation process were mainly conducted by jar-testing as the relevant parameters was controlled. However, many parameters, for example, the intensity and time of agitation etc., have some significant effects on jar-testing. Consequently, a convenient and effective method was so important for water treatment to evaluate efficiency of coagulation. In his research, 2k Fractional Factorial Design was applied to find the important factors from four parameters, including intensity of agitation, time, coagulant dosage and pH in high/low turbidity. Then, the range of optimum operation could be found by Central Composition Design. From the results of 2k Fractional Factorial Design, the coagulant and pH both were dominant parameters in turbidity removal of high/low kaolin concentration by ferric coagulant. Moreover, the turbidity removal had negatively relationship with coagulant in high kaolin concentration, and positively with pH. However, the above result mentioned was exactly opposite to low tkuolin concentration. For high and low kaolin concentration, the range of optimum operation for pH and coagulant dosage had two region in this experiment. The former was 9.2~10, 4.9~6.8 for pH and 15~30 mg/L, 85 mg/L for coagulant, respectively. The latter was 8.05~9.8, 4.3~5.2 for pH and 2~26 mg/L, larger tan 74~90 mg/L for coagulant, respectively. And the turbidity removal in high kaolin concentration was higher about 7~10% than low kaolin. It could be predicted than high kaolin could serve more nucleus than low kaolin while ferric salt hydrolyzed to form ferric hydroxide. |
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