Research On Depth Treatment In Heterogeneous Fenton Method For Biochemical Tailwater Of Vitamin C Pharmaceutical Wastewater

As the industrial development, water shortages and pollution has been a serious obstacle to the sustainable economic and social development in China. Deep treatment and reuse of industrial wastewater is a must. The wastewater that produced in the production process of Vitamin C is with high COD concentration, complex, large changes in water quality&quantity, high chroma as well as true color. There are large amounts of hard-biodegraded and toxicant substances in the water. Through anaerobic and aerobic two-stage biological treatment, most of pollutants from wastewater is hard-biodegraded organics with the low BOD/COD. The text expounds the characteristics of the wastewater in the production process of vitamin C and summaries the treatment of the vitamin C wasterwater and the research progress of the heterogeneous Fenton technology at home and board. In this subject, we made the related experiment research on the vitamin C pharmaceutical wastewater passed biochemical treatment, which is from one production enterprise of vitamin C in Henan.In the experiment, we fistly study active ingredient of the solid catalyst for the heterogeneous Fenton technology, separately studying the adsorption of the Goethite, Magnetite and Pyrite cinder and the catalytic oxidation performance in heterogeneous Fenton technolog. Compared with the heterogeneous catalytic oxidation performance, source, cost and so on, we determine pyrite cinder as supported catalyst in the the heterogeneous Fenton technology at last. At the same time, we also study the adsorption and the catalytic oxidation performance of some metals and metal oxides in heterogeneous Fenton technolog. We choose CuO、AL2o3、TiO2、Nio、Cr2O3and Ag2O as the raw material of heterogeneous catalysts separately. At last, we made pyrite cinder and these metal oxide using high temperature micro-hole technology into the filler particle size3cm. The filler is the heterogeneous catalyst in the experiment. Then, we explore the optimum conditions of the heterogeneous Fenton technology of vitamin C pharmaceutical wastewater with the fillers as catalyst. The concludes as follows:H2O24.9mmol/L, FeSO43.9mmol/L, Mixing reaction time20min, aeration time20min, PAM4mg/L as the optimum condition. In this condition, the removal efficiency of COD in vitamin C pharmaceutical wastewater reached62.42%using the heterogeneous Fenton technology; the highest cost of pharmaceutical operating is only0.98Yuan/m3, if the heterogeneous Fenton technology is applied to engineeringThis experiment provides a certain theoretical basis for practical engineering of Vitamin C production wastewater deep treatment. Meanwhile, it has a certain guiding significance for the stability and catalytic performance of the catalyst in heterogeneous Fenton technology.