Hybrid Treatment of Wastewater Containing Persistent Organic Compounds Using Photo-oxidation and Sonication

光催化-超声（混合）工艺是一种新型的无氧化废水处理工艺。以酸性橙52 （AO52）为模型染料，研究了无机离子、各种曝气气体和双组分混合物对AO52分解的影响。在AO52溶液中加入氯离子作为无机离子，降低了AO52对总有机碳（TOC）的分解效率。从暗条件下的吸附实验结果来看，氯离子在光催化剂表面的吸附抑制了催化剂的活性。在双组分混合物的情况下，混合工艺的分解效率高于单独使用光催化和声溶工艺的分解效率。混合工艺对于多组分溶液的处理更为有效。氩气、氧气、氮气和空气被用作曝气气体。混合工艺的A、More O52和TOC在氧气条件下分解效率最高。这是由于氧促进了自由基反应。因此，AO52和中间产物被有效分解。疏水和亲水物质主要分别通过自由基反应和热分解进行分解，使得杂化过程中的分解效率高于光催化和声解过程。但是，根据加工条件选择曝气气体是很重要的，因为有效气体因分解机理和物质的物理性质不同而不同。发现除氮气体在处理前为除去溶解的氮而鼓泡，阻碍了硝酸盐离子的产生。利用斑马鱼生发囊泡的衰变活性，对杂交工艺处理后的溶液进行生物活性检测。该溶液无生物活性。这说明光催化与声催化的混合工艺是安全的、对环境友好的

Photo-catalysis with sonication (Hybrid) process is a new wastewater treatment process without oxidizing reagents. In this study, the effects of inorganic ions, kinds of aeration gas, and two-component mixture on the decomposition of acid orange 52 (AO52) used as a model dye have been investigated.When chloride ion used as inorganic ion was added into AO52 solution, the decomposition efficiency of total organic carbon (TOC) was decreased. From the result of the adsorption experiment under the dark condition, it was found that the adsorption of chloride ion on the surface of photocatalyst inhibits the catalyst activity.In the case of two-component mixture, the decomposition efficiency for the Hybrid process was higher than those for the processes Photocatalysis and Sonolysis processes were used separately. The Hybrid process is more effective for the treatment of multi-component solutions.Argon, oxygen, nitrogen, and air were used as the aeration gas. The decomposition efficiencies of A … More O52 and TOC for the Hybrid process were the highest when the oxygen gas was used. This is attributed to the promotion of radical reaction by oxygen. Therefore, AO52 and intermediate products were effectively decomposed. The hydrophobic and hydrophilic substance are mainly decomposed by radical reaction and thermal decomposition, respectively so that the decomposition efficiency in the Hybrid process become higher than those in the Photocatalysis and the Sonolysis processes. However, the selection of the aeration gas according to the processing conditions is important because the effective gas is different by the decomposition mechanism and the physical properties of the substanceThe nitrate ion is produced by using the ultrasound. It is found that the bubbling of gas except nitrogen in order to remove the dissolved nitrogen before the treatment prevent the nitrate ion production.The examination of bioactivity of the solution after the treatment using Hybrid process was conducted by using the decay activity of the germinal vesicle of zebrafish. The solution showed no bioactivity. This indicats that the Hybrid process, that is, Photo-catalysis with sonication process, is safe and friendly to the environment Less