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題 名 | 利用臭氧去除養殖水中亞硝酸鹽之研究 |
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作 者 | 洪和結; | 書刊名 | 技術學刊 |
卷 期 | 7:4 1992.12[民81.12] |
頁 次 | 頁373-380 |
分類號 | 439.6 |
關鍵詞 | 亞硝酸鹽; 臭氧; 養殖水; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究乃以批式反應槽及氣液逆向接觸兩種方式,選定不同反應條件,利用臭氧消耗量之測定,計算出養殖海水中亞硝酸根離子之去除率,反應條件之改變:包括pH值之調節(3.8~ 10.2)、改變液體流量、改變亞硝酸鹽濃度、改變臭氧濃度,分別測出亞硝酸根離子之去除率。對養殖海水而言, pH值約為7時,亞硝酸根離子之去除率最佳;Ph值小於6.7時,在相當大之pH值範圍內亞硝酸根離子之去除率隨pH值增加而增加;pH值大於6.7時,由於一部份臭氧分解為OH.自由基, OH.乃成為第二種氧化劑,活性大且無選擇性,因此對海水中亞硝酸根離子氧化為硝酸根離子之特定反應,效率反而降低。由實驗結果顯示,氣相總括質傳係數(Kga)隨液體流量增加而增加。亞硝酸根離子之去除率:(1)隨臭氧濃度增加而增加,(2)隨亞硝酸根離子濃度減少而增加,(3)隨液體流量減少而增加。比較氣液逆向接觸和批式反應槽兩種方式之亞硝酸根離子去除率,前者較後者為佳,此乃困在逆向接觸中氣液接觸面積較批式反應槽為大。 |
英文摘要 | In this research, the different reaction conditions and the efficiency of eliminating nitrite ions in breeding sea water are based on ozone consumption measured by conventional batch-type or continuous-flow methods. By altering reaction conditions, such as adjusting pH (3.8-10.2) value, changing liquid flow rates, changing the nitrite concentration, and changing the concentration of ozone, the efficiency of elimination nitrite ions are measured. The efficiency of eliminating nitrite ions has a maximum at the pH about 7 in breeding sea water. At the pH value below 6.7, the efficiency of eliminating nitrite ions therefore increases proportionally to the pH value over a wide range of pH values. At the pH value above 6.7, during ozonation of water, part of the ozone normally decomposes to OH.radicals, which can act as secondary oxidants. OH.radicals are highly reactive and therefore non-selective. Thus, the efficiency which they oxidize a specified solute (such as nitrite ion) in sea water is decreased. The overall volumetric mass transfer coefficient in gas phase (Kga) is increased with increasing liquid flow rate. The efficiency of eliminating nitrite ions is increased when (1) the concentration of ozone is increased, (2) the concentration of nitrite ion is decreased and (3) the flow rate of liquid is decreased. Comparing the efficiency of eliminating nitrite ions for continuous-flow with batch-type, it reveals that the efficiency of the former is superior to the latter. This is due mainly to ozone has larger gas-liquid contact areas in continous-flow than batch-type, it reveals that the efficiency of the former is superior to the latter. This is due mainly to ozone has larger gas-liquid contact areas in continous-flow than batch-type. |
本系統中英文摘要資訊取自各篇刊載內容。