本研究利用紫外線/過氧化氫程序處理水溶液中含氮之物質，包含氨氮以及尿素，並分別探討初始溶液pH值、光源強度、初始過氧化氫濃度與初始反應物濃度等變因對反應物去除之影響。
以紫外線/過氧化氫程序處理氨氮水溶液之系統中，溶液pH值為影響反應之重要因素。由於氨氮及過氧化氫的酸解離常數(pKa)分別為9.3及11.6，因此溶液pH值的改變會分別影響水溶液中氨氮及過氧化氫之物種分布情形，本研究之實驗結果顯示，在酸性及中性條件下並沒有氨氮被降解；然而在鹼性條件下，隨著初始pH值上升，氨氮降解之效率隨之增加，但當pH值大於11時，其氨氮降解之效率卻明顯的下降。
光源強度及初始過氧化氫濃度亦會對系統中氨氮降解之效率產生影響，實驗結果中指出隨著光源強度的增加，單位時間單位面積提供之光能量增加，有較好的氨氮降解效率。另外，隨著過氧化氫濃度的增加，提供較多的氫氧自由基，有助於氨氮降解效率之提升，但添加過量的過氧化氫，過氧化氫及其生成的超氧化氫自由基會與氫氧自由基反應，造成氨氮降解效率下降。
本研究初步認為，以紫外線/過氧化氫程序降解水溶液中之氨氮物質，其最適操作條件為：初始溶液pH=10，光源強度=8.93 mW/cm2，初始過氧化氫濃度=480 mg/L。在此操作條件下，反應120分鐘後，水溶液中氨氮去除率可達45.33%。
最後，本研究亦發現，使用紫外線/過氧化氫程序處理水溶液之尿素物質，不具有顯著之效果，可能原因是尿素具有共振結構，穩定地存在於水溶液中，因此不利於紫外線/過氧化氫程序中所產生的親電性氫氧自由基進行反應。

Degradation of nitrogenous substances, including ammonia and urea, in aqueous solution by UV/H2O2 process was studied under various initial solution pH, light intensity, initial hydrogen peroxide concentration and initial reactant concentration to evaluate the removal efficiencies of ammonia and urea.
In the UV/H2O2 system, the initial solution pH was a significant factor to affect the degradation of ammonia. It is attributed to ammonia and hydrogen peroxide could decompose in aqueous solution with the pKa values of 9.3 and 11.6, respectively. Results showed that the degradation of ammonia was found to be enhanced with the increase of initial solution pH under alkaline condition, whereas there was no ammonia degradation under acidic and neutral conditions. However, the removal efficiency would decrease when the pH value above 11.
On the other hand, the light intensity and initial hydrogen peroxide would also influence the removal efficiency of ammonia. Results showed that the degradation of ammonia increased with increasing light intensity and hydrogen peroxide dosage. However, further addition of hydrogen peroxide would decrease the removal efficiency of ammonia because of the excessive of hydrogen peroxide could become scavengers of hydroxyl radicals.
In this study, the optimum operating conditions for degradation of ammonia in the UV/H2O2 system was as follows: initial solution pH 10, light intensity 8.93 mW/cm2, and initial hydrogen peroxide concentration 480 mg/L. according to the conditions, the maximum removal efficiency of ammonia is 45.33% after 120 minutes.
Finally, it was no significant effect to remove urea in aqueous solution by UV/H2O2 process. This result would be explained by the property of urea in the aqueous solution. In the aqueous solution, urea is a stable compound due to resonance structures, which is hardly attacked by electrophile of hydroxyl radical.

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