バイオフェントン反応を用いた微量有害物質除去に関する研究

研究了异相铁催化剂作为生物fenton工艺铁源的可能性，并在泰国人工湿地中试中进行了应用。因此，非均相铁催化剂在实验室研究中成功应用于生物Fenton （bio-Fenton）工艺；然而，这一过程在中试规模的人工湿地中效果不佳。需要进一步研究以确定实际废水处理的最佳条件。研究采用了胶体水合铁、铁离子交换沸石和磁铁矿颗粒等铁材料。采用荧光探针对生物fenton过程中OH自由基的形成和反应部位进行了鉴定。在植物根系表面观察到强烈的荧光。此外，在实验室批量实验中，添加固体铁材料后，痕量有机污染物被快速去除。在野外实验中，我们选择甲胺酸和N，N ' -二乙基-间甲苯酰胺作为目标化合物，因为它们的检测浓度相对较高。即使将胶体水合铁溶液注入湿地，也无法达到去除效果。此外，植物中过氧化氢的消耗与PPCPs的去除之间没有明确的关系。利用实际废水进行了批量实验，以确认目标PPCPs可以被处理。虽然观察到浓度显著降低，但很难说这一过程是有效的。

The possibility of heterogeneous iron catalysts as iron source in bio-Fenton process was studied as well as the application of the process to a pilot-scale constructed wetland in Thailand. As a result, heterogeneous iron catalysts were successfully applied to biological Fenton (bio-Fenton) process in laboratory study; however, this process did not work well in a pilot-scale constructed wetland. Further study will be needed to investigate the optimum conditions for actual wastewater treatment.Iron materials such as colloidal ferrihydrite, ferric ion-exchanged zeolite and magnetite particles were used for this study. A fluorescence probe was used to identify the formations and reaction sites of OH radicals in bio-Fenton process. Strong fluorescence was observed in surface parts in roots of plants. Moreover, in the laboratory batch experiments, a trace organic pollutant was quickly removed after addition of solid iron materials. In field experiments, mefenamic acid and N,N’-diethyl-m-toluamide were selected as target compound because they have been detected in relatively high concentrations. Even colloidal ferrihydrite solution was injected into the wetland, the removals could not be achieved. In addition, no clear relation between consumption of hydrogen peoxide in plants and removals of PPCPs was obtained. Batch experiments using actual wastewater were conducted to confirm that the target PPCPs could be treated. Although a significant decrease of the concentration was observed, it is hard to say the process was effective.