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題名 | 可提升水域上下對流之多規格間歇式湧升柱設計與應用=Design and Application of the Adapted Intermittent Air-lift Columns for Up Welling Water |
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作者 | 侯文祥; 鄧德慧; 潘泰斗; |
期刊 | 臺灣水利 |
出版日期 | 20100900 |
卷期 | 58:3=231 2010.09[民99.09] |
頁次 | 頁76-86 |
分類號 | 445.25 |
語文 | chi |
關鍵詞 | 湧升柱; 溶氧; 優養化; 水質改善; Air-lift column; Dissolved oxygen; Eutrophication; Water treatment; |
中文摘要 | 本研究彙整自24至28年研發的Ⅰ至Ⅲ型文獻成果,並設計Ⅳ至Ⅵ型的多規格湧升柱,分析各類型湧升柱效能。以上六種規格的湧升柱,主要改變包括空氣室截面積、出水口方式、內管體積等設計因子。 研究結果得知,Ⅰ至Ⅵ型湧升柱的標準曝氣效率(Standard Aeration Efficiency,SAE)分別為0.56、0.72、1.5、1.46、1.52、1.56 kg O2 / hr / kw,顯示Ⅲ至Ⅵ型的增氧效率為Ⅰ、Ⅱ型的兩倍以上。Ⅰ至Ⅵ型湧升柱的一次交換水量分別為0.41、0.82、0.61、0.08、0.82、2.86公升。湧升柱的設計因子中,內管體積比、內管徑高比並非影響增氧效率的主要因子;空氣室徑高比應設計大於1,空氣室截面積比與空氣室體積比均需提高至約7,可以有效增加湧升柱的標準曝氣效率至約1.5,提升增氧效率。 再依不同之設備放置深度,利用流場分佈判斷湧升柱的攪動水體擴散半徑,Ⅲ型湧升柱為3 m,Ⅴ型湧升柱為3.5 m,Ⅵ型湧升柱為5 m。選用效率最佳之Ⅵ型湧升柱,其出水口增氧能力,20分鐘約提高水體溶氧1 mg/L。Ⅵ型湧升柱於1 m水深水域運作時,單位耗電成本的交換水量最高,約178.8 m3/元。得知湧升柱的間歇湧升時間隨入氣速度變大而減小,隨配置水深增加而增大,可利用內插法得到各類型湧升柱在不同配置水深、不同入氣速度的間歇湧升時間。根據本研究成果,日後可依不同水域的水質環境特性與不同改善目的,選擇適當的湧升柱規格進行配置。 |
英文摘要 | This study analyzes the efficiency of six types of intermittent air-lift column (IALC) byboth of references from 24 to 28. The main design factors of IALC includes cross-sectionarea of air chamber, types of water outlet, volume of inner tube, et al. Standard aeration efficiency of type I to VI IALC was .56, .72, 1.5, 1.46, 1.52, 1.56 kg O2/ hr / kw, respectively. It means that the aeration efficiency of type III to Ⅵ IALC were overtwo times better than type I to II. Water exchange volume of type I to Ⅵ IALC was .41, .82,.61, .8, .82, 2.86 liters, respectively. Comparing with the design factors, ratio of inner tubevolume, ratio of diameter and height of inner tube were not main factors which affect aeration efficiency. Ratio of diameter and height of air chamber should be larger than 1. Ratio of crosssectionarea and ratio of air chamber volume should be over to 7 for advancing the standardaeration efficiency to 1.5. By the result of flow field distribution to determine the water mixing efficiency for IALC,type III is 3 meter radius, type V is 3.5 meter and type VI was 5 meter radius. Choose type VI,the best aeration efficiency of IALC, increase 1 mg/L of dissolved oxygen near water outletabout 2 minutes at 1 m water depth. The max water exchange cost of type VI was 178.8 m3per NT dollar. Otherwise, increasing the pumping velocity and water depth, intermittent timeof IALC was decreased. We can use interpolation to get the optimum intermittent time of different types of IALC at different water depth with different pumping velocities. Accordingto the achievement of this study, we suggest a suitable standard of IALC to treat water throughdifferent water qualities and environment. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。