以電-芬頓程序處理有機廢水的成效已受肯定，不僅能有效地解決傳統芬頓系統中，所產生的污泥問題，更能提高系統處理的效率。本研究採用電-芬頓程序，來處理含有機酸之廢水。一般而言，含有比較高碳數有機污染物在傳統高級氧化程序中，因氧化作用而分解成碳數較低的有機酸，但是低碳數有機酸繼續礦化成二氧化碳及水的效率不高， 因此這些有機酸往往才是處理的重點。基於如此， 本研究將以醋酸(CH3COOH)、檸檬酸(C6H8O7)及草酸(COOH)2三種有機酸，做為電-芬頓程序處理系統中的去除對象。結果顯示，在實驗起始條件為亞鐵離子濃度0.0036 M、過氧化氫濃度0.2326 M、電流2安培通電120分鐘和調整處理液pH至2.0之情形下，以電-芬頓程序分別處理0.01M醋酸、0.01 M檸檬酸及0.01 M草酸的溶液，在反應時間120分鐘後三者最佳的COD去除效率分別可達100%、90%及80%。若是以電-芬頓程序來去除有機污染物的話，即使有氯離子的抑制作用存在，但其影響程度不明顯。故電-芬頓程序確實能有效地處理含有機酸之廢水。 The efficiency of electro-Fenton process in the treatment of organic wastewaters has been confirmed. This technology can reduce the amount of sludge produced in traditional Fenton process and also can promote the treatment efficiency due to the reduction of ferric to ferrous ions on the cathode. By the reduction reaction, the ferrous ions can react with hydrogen peroxide and then reduce the applied ferrous ion concentration. In addition, the oxidation reaction occurs on the anode, leading to the direct oxidation of chemicals. In general, the organics with high carbon content are easy to be oxidized to form lower carbon–containing chemicals. However, the mineralization efficiency of these intermediates is low. Therefore, three organic acids, namely acetic, citric and oxalic acids, were selected as the target compounds to simulate the wastewater treated by electro-Fenton process. Results show that the COD removal by the electro-Fenton process were 100, 90 and 80 % for acetic, citric and oxalic acids, respectively when the experimental conditions are: (1) [Fe2+]=0.0036 M, (2) [H2O2]=0.2326 M, (3) current=2 A, (4) initial pH= 2.0, (5) concentration of organic acid= 0.01 M. Additionally, chloride ions have no obvious effect on the electro-Fenton reaction.
