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

光催化-超声复合工艺是一种新型的无氧化剂废水处理工艺。以酸性橙子52（AO 52）为模型染料，研究了无机离子、曝气气体种类及双组分混合物对AO 52降解的影响，结果表明，氯离子作为无机离子加入到AO 52溶液中，降低了AO 52对总有机碳（TOC）的降解效率。在黑暗条件下的吸附实验结果表明，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，混合过程的分解效率高于光催化和声分解过程。混合工艺对于处理多组分溶液更有效，采用氩气、氧气、氮气和空气作为曝气气体。A的分解效率 关于我们 当使用氧气时，混合工艺的O 52和TOC最高。这是由于氧促进了自由基反应。因此，AO 52和中间产物被有效地分解。疏水和亲水物质主要分别通过自由基反应和热分解来分解，因此杂化过程中的分解效率比光催化和声分解过程中的分解效率高。然而，根据处理条件选择通气气体是重要的，因为有效气体因物质的分解机理和物理性质而不同。硝酸根离子是通过使用超声波产生的。结果表明，除氮气外，在处理前鼓泡去除水中溶解的氮，可抑制硝酸根离子的产生。利用斑马鱼生殖囊泡的衰变活性，对Hybrid工艺处理后的溶液进行了生物活性检测。该溶液未显示出生物活性。这表明光催化-超声复合工艺是一种安全、环境友好的工艺

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