請用此 Handle URI 來引用此文件: http://hdl.handle.net/11455/91708
標題: 二氧化氯之電解製備及其應用於改善養殖水體之研究
Chlorine dioxide generation by electrolytic process and its applicability on the improvement of aquaculture water
作者: Yi-Tze Tsai
蔡翼澤
關鍵字: 二氧化氯
隔膜電解
養殖水體
混合性二氧化氯
chlorine dioxide
membrane electrolysis
aquaculture
mixed chlorine dioxide
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摘要: 近數十年來,由於二氧化氯(Chlorine dioxide, ClO2)優異的消毒效能及其相較於氯(Chlorine, Cl2)有較佳的有害消毒副產物控制能力,因而被廣泛的應用到各相關領域,包含如淨水程序、冷卻水系統、廢水處理、室內空品及環境消毒滅菌等。二氧化氯於傳統上之製備方式多以純化學酸化法來進行操作,但其仍舊有產製濃度不易控制及無法連續製備等缺欠,相較於傳統方式,電化學技術可透過電解含特定化學物質之陽極電解液來產製同時具備高純度及高濃度特性之二氧化氯,且該法有用藥簡單、操作容易及現地連續產出等優勢。本研究擬以自行架設之隔膜電解機組做為產製二氧化氯溶液之電解設備,並透過各相關軟硬體參數之調控,以尋求適用於本研究之最佳操作條件,期供未來各相關領域之研究參酌。此外亦同時以養殖水體為試驗目標,進行水質改善之可行性研究,用以探討本研究所自行產製之二氧化氯溶液是否於該應用領域具相對之實用價值。 本研究之實驗內容包含有「以電化學法產製二氧化氯」及「改善養殖水體之可行性」等兩階段試驗。研究結果顯示,由第一階段之試驗成果可知,當以固定操作電壓12 V、陰極電解液0.5 % NaOH、陽極電解液2 % NaCl混合6 % NaClO2及陽極電解液初始溫度30 ℃進行批次電解操作時,可於操作達20分鐘得濃度及純度分別為906.5 mg/L及98.4 %之二氧化氯溶液。若進一步以陽極電解液進流速率120 ml/min及固定操作電流70 A進行連續電解操作時,可於操作達30分鐘後連續且穩定產出濃度大於600 mg/L且純度高於98 %之二氧化氯溶液;由第二階段之試驗成果可知,當以氨氮及亞硝酸根離子為待處理目標污染物,同時亦將硝酸根離子納入質量平衡計算時,其質量平衡之損失與所添加處理藥劑中氯之含量多寡成正相關性。此外本研究所自行產製氯及二氧化氯重量比為1 : 1之混合性溶液,於降解氨氮及亞硝酸根離子之去除效能明顯優於高純度二氧化氯,且亦可有近似於氯降解污染物之能力。
Owing to its higher efficiency and better control of disinfection by-products compared with chlorine (Cl2), chlorine dioxide (ClO2) have been widely applied as disinfectant in public water system, cooling system control and wastewater treatment in the past decades. ClO2 of high purity and high concentration can be electrochemically produced when using anolyte composed of specific chemical compounds. Compared with the traditional process, electrochemical process has the advantages of simple dosing, ease of operation and continuous production onsite. In this study, different parameters of membrane electrolysis are varied to determine the appropriate conditions for ClO2 generation. Moreover, the feasibility on the improvement of aquaculture water by chlorine dioxide are also examined. Experimental results show that the batch membrane electrolysis, conducted at operation voltage of 12 V using anolyte composed of 2 % NaCl and 6 % NaClO2 with initial temperature of 30 ℃ and NaOH catholyte of 0.5 % concentration, can yield ClO2 of 906.5 mg/L concentration and 98.4 % purity. Moreover, the subsequent electrolysis was conducted at operation current of 70 A and anolyte feed rate of 120 ml/min, the concentration and the purity of ClO2 were continuously over 600 mg/L and 98 % after 30 min operation, respectively. The mixture that was composed of chlorine and chlorine dioxide had the better efficiency than pure chlorine dioxide on the removal of ammonia nitrogen and nitrite. The loss of mass balance, dividing ammonium, nitrite and nitrate, is also found to be positively correlated with additional rate of chlorine.
URI: http://hdl.handle.net/11455/91708
文章公開時間: 2013-11-19
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