益達胺為台灣常見的有機氮殺蟲劑，其廢水使用一般生物處理法及物理處理法無法有效地去除，因此，本研究希望藉由光電化學法在含氯水溶液中礦化益達胺合成廢水(總有機碳濃度為100 ppm、總氮濃度為64.8 ppm)，以電化學法產生次氯酸，並加入紫外光產生氯離子自由基及氫氧自由基，提高整體氧化力，操作變因包含氯離子劑量、初始酸鹼值、控制酸鹼值、電流密度、溫度以及光強度。實驗結果也發現益達胺的降解過程符合一階動力學理論，在最佳條件下：氯離子劑量0.2 M、酸鹼值5.5，電流密度1.24 mA/cm2 、光強度6.4 mW/cm2，並控制溫度在40 oC，最終可得98.4%的總有機碳去除率以及大於99%的總氮去除率，且過程中的無機氮鹽濃度皆低於1 ppm ，終能以氯離子、二氧化碳、氮氣及水為最終成分，無二次汙染之虞。

The pesticides from agricultural and industrial wastewater are recalcitrant to the physical and biological methods. This study aims to examine the removal of imidacloprid (TOC0 = 100 ppm, total nitrogen = 64.8 ppm) which is one of common pesticides through photo-assisted electrochemical treatment in solutions containing sodium chloride. Operating variables included the dosage of chloride ions, initial pH, controlled pH, current density, temperature and light intensity. The experimental results revealed that the degradation of imidacloprid followed a first order kinetic model. Under optimal conditions: [NaCl] = 0.2 M (0.05-0.5 M), pH 5.5 (1.5-9.5), current density = 1.24 mA/cm2 (0-2.48 mA/cm2), 6.4 mW/cm2 (254 nm UVC irradiation) at 40 oC (20-40 oC) for 4 hours, 98.4 % and larger than 99 % of TOC and nitrogen removal were obtained, respectively. Consequently, the concentration of inorganic nitrogen - ammonia, nitrate and nitrite - were lower than 1 ppm without the production of secondary pollutants after treatment.

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