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

研究了非均相铁催化剂在生物Fenton工艺中作为铁源的可能性，并将该工艺应用于泰国的一个中试人工湿地。因此，在实验室研究中，多相铁催化剂被成功地应用于生物Fenton(BIO-Fenton)工艺，但该工艺在中试规模的人工湿地中效果不佳。实际废水处理的最佳条件还有待进一步研究。本研究使用了胶体水合铁、铁离子交换沸石和磁铁矿颗粒等铁质材料。利用荧光探针研究了生物Fenton过程中羟基自由基的形成和反应部位。植物根的表面部有较强的荧光。此外，在实验室批量实验中，加入固体铁材料后，微量有机污染物被迅速去除。在现场试验中，甲氰菊酸和N，N‘-二乙基-间甲苯甲酰胺被选为目标化合物，因为它们在较高浓度下被检测到。即使向湿地中注入胶体铁水溶液，也无法达到去除效果。此外，工厂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，证实了目标PPCPs是可以处理的。虽然观察到浓度显著下降，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.