Hsing Hao-Jan, Chiang Pen-Chi, Chang E-E, Chen Mei-Yin
Graduate Institute of Environmental Engineering, National Taiwan University, 71 Chou-Shan Road, Taipei 106, Taiwan, ROC.
J Hazard Mater. 2007 Mar 6;141(1):8-16. doi: 10.1016/j.jhazmat.2006.05.122. Epub 2006 Nov 7.
The comparison of different advanced oxidation processes (AOPs), i.e. ultraviolet (UV)/TiO(2), O(3), O(3)/UV, O(3)/UV/TiO(2), Fenton and electrocoagulation (EC), is of interest to determine the best removal performance for the destruction of the target compound in an Acid Orange 6 (AO6) solution, exploring the most efficient experimental conditions as well; on the other hand, the results may provide baseline information of the combination of different AOPs in treating industrial wastewater. The following conclusions can be drawn: (1) in the effects of individual and combined ozonation and photocatalytic UV irradiation, both O(3)/UV and O(3)/UV/TiO(2) processes exhibit remarkable TOC removal capability that can achieve a 65% removal efficiency at pH 7 and O(3) dose=45mg/L; (2) the optimum pH and ratio of [H(2)O(2)]/[Fe(2+)] found for the Fenton process, are pH 4 and [H(2)O(2)]/[Fe(2+)]=6.58. The optimum [H(2)O(2)] and [Fe(2+)] under the same HF value are 58.82 and 8.93mM, respectively; (3) the optimum applied voltage found in the EC experiment is 80V, and the initial pH will affect the AO6 and TOC removal rates in that acidic conditions may be favorable for a higher removal rate; (4) the AO6 decolorization rate ranking was obtained in the order of O(3)<O(3)/UV=O(3)/UV/TiO(2)<EC<Fenton; (5) the ranking of TOC removal efficiency of selected AOPs was in the order of O(3)=Fenton<EC<O(3)/UV<O(3)/UV/TiO(2) for 30min of reaction time.
比较不同的高级氧化工艺（AOPs），即紫外线（UV）/二氧化钛（TiO₂）、臭氧（O₃）、臭氧/紫外线（O₃/UV）、臭氧/紫外线/二氧化钛（O₃/UV/TiO₂）、芬顿法和电凝聚法（EC），对于确定在酸性橙6（AO6）溶液中破坏目标化合物的最佳去除性能很有意义，同时也在探索最有效的实验条件；另一方面，这些结果可为不同AOPs组合处理工业废水提供基础信息。可以得出以下结论：（1）在单独和联合臭氧化及光催化紫外线照射的效果方面，臭氧/紫外线（O₃/UV）和臭氧/紫外线/二氧化钛（O₃/UV/TiO₂）工艺均表现出显著的总有机碳（TOC）去除能力，在pH值为7且臭氧剂量为45mg/L时，去除效率可达65%；（2）芬顿法的最佳pH值和[H₂O₂]/[Fe²⁺]比例分别为pH 4和[H₂O₂]/[Fe²⁺]=6.58。在相同的HF值下，最佳的[H₂O₂]和[Fe²⁺]分别为58.82和8.93mM；（3）电凝聚实验中发现的最佳施加电压为80V，初始pH值会影响AO6和TOC的去除率，因为酸性条件可能有利于更高的去除率；（4）AO6脱色率的排序为：臭氧（O₃）＜臭氧/紫外线（O₃/UV）=臭氧/紫外线/二氧化钛（O₃/UV/TiO₂）＜电凝聚法（EC）＜芬顿法；（5）对于30分钟的反应时间，所选AOPs的TOC去除效率排序为：臭氧（O₃）=芬顿法＜电凝聚法（EC）＜臭氧/紫外线（O₃/UV）＜臭氧/紫外线/二氧化钛（O₃/UV/TiO₂）。
