Oxidation Of Catalytic Oxidizing Non-biodegradable Organic Wastewater In Heterogeneous UV/Fenton Process

There are many non-biodegradable organic compounds in pesticide, printing and dyeing, pharmaceutical and chemical industry wastewater, such as hydroxybenzene, sodium dodecylbenzene dulfonate, chlorophenols, pesticide, polychlorinated biphenyls, PAHs, nitroaromatic chemicals, dye and humic acid etc. Some of them have serious harm to environment and human being because of their carcinogenic, teratogenic and mutagenic effect. Current technology and process of the treatment of the refractory degradation wastewater are physic-chemical, biological and physic-chemical-biological process etc. Scientific interest of AOPs-biological process has awakened recently. In the various methods of wastewater pre- or after-treatment, the UV/Fenton procedure be of its high activity and efficient, is a relatively novel subject with tremendous potential in the near future in the AOPs. However, there are still many technology and theoretic problem to be settled. The process has aroused the abroad recognition of researchers recently and abundant studies have been carried out. Our research group also has outspread many investigations. We find some drawbacks of the homogeneous UV-Fenton process such as the limited pH range and the operation of iron regeneration etc. Immobilizing iron on certain appropriate carrier to preparation the immobilized catalyst will overcome such drawbacks. Such methods are attracting abroad interesting and recognition. Many correlative studies have been carried out during the last few years.The main problems existed in research of heterogeneous UV/Fenton process are: (1) Many catalyst carriers are too complicated and expensive to extend to industry application. (2) The prepared heterogeneous UV/Fenton catalyst run short of stabilization because of the leakage of effective components. (3) Although most of the catalysts can oxidize contamination efficiently, the efficiency of removal of COD is still under improvising. (4) More research on the deep color dyestuff effluents in the heterogeneous UV/Fenton process should be carried out because of the consanguineous relationship of the concentration, color and the UV intensity. (5) The mechanism of the heterogeneous UV/Fenton process is still not explicit. (6) The dynamic characteristic of the heterogeneous UV/Fenton process is still need moreresearch. (7) There are still many theoretic and practical problems of the industry complication of catalytic oxidation in the heterogeneous UV/Fenton process, such as the UV light, the heterogeneous UV reactor, series heterogeneous UV/Fenton catalysts, the addation amount of HfeCh etc.Account for the problems of the study on the heterogeneous UV/Fenton process, this article focused on the following works: (DThe immobilization of Fe2+. The main aim is to select proper carrier, determine the preparation process of the catalysts and evaluate their performance etc. (2) Optimizing preparation of multi-metal multiple catalyst to improve the catalytic oxidation efficiency, and characterizing and evaluating the multiple catalyst. (3) The process of the treatment of 4BS solution in the multiple catalyst heterogeneous UV/Fenton process. (4) The mechanism of the heterogeneous UV/Fenton process by detecting the immediate. (5) The dynamic characteristic of the heterogeneous UV/Fenton process.Through the research of such aspects, the article obtained following results:(1) Na-Y zeolite is a satisfactory Fe carrier of the heterogeneous UV/Fenton catalyst. Catalytic oxidizing phenol in the heterogeneous UV/Fenton process with optimizing prepared Fe-Y catalyst showed that, there was certain leakage of Fe2+ (6.5%) when the catalyst was used firstly and there almost no more leakage of Fe2+in the next five. Results showed that, the Fe-Y heterogeneous UV/Fenton process could efficiently catalytic oxidize phenol in a wider pH various (2.0-10.0). When added 0.25 Qth FfeOa and 0.20g catalyst in the 1000 mL phenol wastewater whose temperature was 35 and concentration was 200mg-L"1, the phenol removal ratio reached more than 99% after 30 min...