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題名 | Effects of Oxygen on the Nitrogen Transformations in a Slow-Flowing Open Channel=在淺慢渠逆流中溶氧量對氮化物轉變的影響 |
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作者 | 李錦地; 呂鴻光; 歐陽嶠暉; Lee, Chin-dee; Leu, Horng-guang; Ouyang, Chaio-fuei; |
期刊 | 中國工程學刊 |
出版日期 | 19990700 |
卷期 | 22:4 1999.07[民88.07] |
頁次 | 頁391-399 |
分類號 | 460.02 |
語文 | eng |
關鍵詞 | 開渠; 氮轉化; 溶氧濃度; 轉化率; 混合膜; Open channel; Nitrogen conversion; Dissolved oxygen concentration; Conversion rate; Mixed-films; |
中文摘要 | 本研究探討在渠道流中,溶氧及流速變化對水中氮化合物轉化路徑及速率之影響 。在實驗中使用硫酸銨及葡萄糖為外加基質。實驗結果顯示,在定流速下,當溶氧量大於 1 mg/L 時,總氮去除速率和氨氮去除速率成線性相關,在這種情況之下, 氮化合物之去除速 率比較如下:氨氮>總氮>硝酸氮>亞硝酸氮;同時在所有試驗中亞硝酸氮濃度累積,而硝 酸氮濃度只在溶氧量在 3-5 mg/L 時增高,相對地當水中溶氧量少於 1 mg/L, 所有的氮氧 化物都可被去除,其去除速率比較如下:總氮>硝酸氮>亞硝酸氮>氨氮。依上述實驗結果 顯示,由水中含氧量高低,可判定其氮氧量化物的轉化路徑。另外,流速率變化也很明顯地 影響氮化合物的轉化速率,當溶氮量小於 1.5 mg/L 時,總氮去除速率和雷諾量的關係曲線 如 v 字型;當溶氧量大於 5 mg/L 時,兩者的關係曲線如倒 v 字型。 |
英文摘要 | This study investigated the effects of dissolved oxygen (DO) concentration and flow conditions on the conversion rates and pathways of nitrogenous compounds in an pilot open channel. Ammonium sulfate and glucose were added externally as the substrates in the investigation. The experimental results showed that under conditions of constant flow velocity and DO concentration above I mg/L the removal rates of total nitrogen (including nitrite, nitrate and ammonium nitrogens) varied linearly with the removal rates of ammonium nitrogen. Comparison of the removal rate for each individual nitrogenous component reveals the following order of removal rates: ammonium nitrogen>total nitrogen>nitrate nitrogen> nitrite nitrogen. Moreover. the nitrite concentration was found to increase in all tests and the nitrate concentration was increased only when the DO concentration was within the range of 3 to 5 mg/l. In contrast, when the DO concentration was less than 1 mg/l. all nitrogenous compounds were removed and the following order of removal rates of nitrogenous compounds was observed: total nitrogen>nitrate nitrogen> nitrite nitrogen>ammonium nitrogen. The results indicated that the conversion pathways of nitrogenous compounds can be divided into four different types depending on the DO concentration level. The test results also revealed that an increase in the flow velocity significantly influenced the conversion rates of nitrogenous compounds. While a V-shaped relation of the removal rates of total nitrogen vs the Reynolds numbers was observed for low DO below 1.5 mg/l, an inverted V-shaped relation occurred at high DO above 5 mg/l. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。