電解氧化去除水中亞硝酸鹽氮之探討

On the Study of Toxic Nitrite Removal Using Electrolytic Oxidation

孫志誠(Chih-Cheng Sun) ； 王瑞彥(Jui-Yann Wang) ； 張純萍(Chun-Ping Zhang) ； 林家鍵(Jia-Jian Lin)

《永達學報》 9卷1期 (2008/06) Pp. 75-85

https://doi.org/10.30179/BYTITC.200806.0008

摘要

本研究應用直接電解氧化方式，於陽極進行水中亞硝酸鹽氮之氧化去除。亞硝酸鹽氮為水中氨氮氧化過程中之中間產物，其毒性高過氨氮，水中生物對其容忍量甚低，是養殖用水中急須去除之污染物。實驗顯示，在酸性溶液中僅由曝氣之加入即可進行亞硝酸鹽氮之氧化，此可說明亞硝酸鹽氮在酸性條件下之不穩定性。而在水溶液電解過程中，陽極產生氧氣的同時，亦於陽極附近提供一酸性及好氧之環境，故可提升亞硝酸鹽氮之氧化去除。實驗結果顯示，於0.50A之定電流條件下，當溶液濃度由2.00增加至20.00 ppm（mg NO2 -/l）時，其電解反應30分鐘之平均去除速率由1.20增加至13.26mg NO2 -/hr。而當電解電流由0.10增加至1.00 A且溶液濃度為5.00 ppm時，其電解反應30分鐘之平均去除速率由2.28增加至3.13 mg NO2 -/hr。另外，由反應動力之探討得知，電解氧化亞硝酸鹽氮之反應為一級反應，反應之活化能為3.30 Kcal/mol。

關鍵字

電解 ； 氧化 ； 亞硝酸氮 ； 反應動力

並列摘要

The application of direct electrolytic oxidation reaction was discussed in this study. The nitrite in solution was oxidized on anode. The nitrite was a medium product of ammonium oxidation process, the tolerance of living being in aquaculture was very low. It is a significant pollutant needed to remove. The experimental data indicates that the nitrite can be oxidized in acidic aerobic solution, this fact illustrates the unstable of nitrite in acidic condition. In electrolysis process, the oxygen was generated on anode, and the anodic electrode also provides a acidic and aerobic condition, then the oxidation of nitrite was promoted. The experimental results indicate that the average removal rate was increased from1.20 to 13.26 mg NO2 -/hr, when the nitrite concentration was increased from 2.00 to 20.00 ppm (mg NO2 -/l) during 30 minutes electrolysis under the condition of 0.50 A. when the current was increased from 0.10 to 1.00 A under the condition of 5.00 ppm nitrite concentration, the average removal rate of nitrite was increased from 2.28 to 3.13 mg NO2 -/hr. In addition, the kinetics of nitrite oxidation reaction was also studied. The electrolytic oxidation of nitrite was first order reaction, and the activation energy was 3.30 Kcal/mol.

並列關鍵字

Eelectrolysis ； Oxidation ； Nitrite ； Kinetics