高浓度COD之废水，若直接用生物处理法加以处理，其效果往往不尽理想。基於如此，以电-芬顿处理程序来处理高浓度COD废水，已备受各產业界瞩目。其主要原理是利用电解氧化还原的方法，将Fenton反应后所產生的铁离子，在阴极上还原成亚铁离子，再继续与过氧化氢反应，而达到连续循环性地破坏污染物之功效，并且在系统阳极上，可因电解氧化反应而直接氧化有机污染物。因此，电-芬顿法是一种能同时產生两种破坏污染物的反应，进而使污染物矿化，达到降低COD浓度之目的。本研究乃採电－芬顿法处理酚醛树脂废水，并且以改变实验条件中的亚铁离子浓度、过氧化氢浓度、通电电流大小及加药方式，来探讨各条件下，系统对COD去除效果的影响。
结果发现，以电-芬顿法可处理COD浓度高达18000mg/L之酚醛废水，在实验起始条件為亚铁离子浓度1004mg/L、过氧化氢浓度39550mg/L、电流2安培通电2小时及调整处理液pH至2.0的情况下，其最后COD去除率可达85%以上。此外，如果在相同条件下，增加过氧化氢的加药量至59325mg/L时，则COD去除率可达95%以上。Removal of COD from wastewaters with high COD by biological processes generally cannot meet the discharge standard. Therefore, applying AOPs, such as electro-Fenton process, in the treatment of high concentration and toxic wastewater has been got much more attention by the industries. In electro-Fenton process, ferrous ions are regenerated from ferric ions on the cathode, which increases the production efficiency of hydroxyl radicals. On the anode, oxidation reaction occurs and organics can be oxidized. In this study, electro-Fenton process was applied to treat the wastewater coming from the phenol formaldehyde resin industry. Experimental parameters, namely ferrous concentration, hydrogen peroxide concentration, current density and addition mode of reagents, were selected to study their effect on the removal of COD from this kind of wastewater.
Results show that electro-Fenton technology can be used to treat the wastewater containing high concentration of phenol and formaldehyde. When the COD of the wastewater was about 18000 mg/l, the removal ratio can be above 85% under the experimental conditions of Fe2+=1004 mg/l, H2O2=39550 mg/l, current=2 A and pH=2.0. Furthermore, the removal ratio can reach 95% with increasing the hydrogen peroxide concentration to 59325 mg/l
