Study On Oxidation Of Phenol In Waste Water By Heterogeneous Catalytic Wet Hydrogen Peroxide

The toxic properties of phenol are harmful for aquatic life, it can be enriched in plants and animals. Finally, it is passed to mankind along with the food chain. It destroys the function of the human body and affects human health. Therefore, the treatment of wastewater containing phenol has been one of the important and difficult tasks for water treatment research field. Along with the 12th five-year plan "beautiful China"has been put forward, as chemical researchers, we are not only concentrating on the development and utilization of chemical resources, but also studying in the treatment of harmful pollutants.This paper is focus on the heterogeneous catalytic wet peroxide oxidation of phenol wastewater by oxidation treatment technology, using iron as the active component, choosing activated carbon (AC), activated carbon fiber (ACF), γ-Al2O3, SBA-15 as the carrier respectly. We study the preparation and catalytic properties of the catalysts. We choose nano magnetic Fe304 materials and Cu-SBA-15 as catalyst, hydrogen peroxide as oxidant to catalytic oxidation degradation of phenol.Iron oxide as the active component was prepared by impregnation method. The Fe/AC, Fe/ACF, Fe/γ-Al2O3 and Fe/SBA-15 catalysts with hydrogen peroxide as oxidant, the oxidation of phenol experiment, the effect of catalytic oxidation phenol is better when Fe/SBA-15, Fe/γ-Al2O3 Fe/ACF used as catalysts, the phenol removal rate can reach 90% by 2h catalytic oxidation, but the effect of Fe/AC on phenol oxidation is not ideal, it show us that Fe2O3 is not well loaded on AC under the experimental conditions we did.Fe3O4 nano mierospheres are prepared by hydrothermal synthesis method, and it is used as the catalyst, with hydrogen peroxide and air as oxidants. We investigate the effects of processing temperature, solution pH, the catalyst quantity on the effect of phenol oxidation. In the initial phenol concentration of 100rag/L, the processing liquid volume of 150 mL, the dosage of catalyst 0.6g/L, the initial concentration of H2O2 1.1g/L, air flow 300mL/min, processing temperature of 50℃,the processing time of 180min, the phenol removal rate is close to 100%, COD removal rate can reach 62.7%. When the hydrogen peroxide and the air as the oxidant at the same time, the effect of oxidation phenol is better than separate hydrogen peroxide or separate air as the oxidant. The analysis on the used Fe3O4 after recove, it shows that nano microspheres morphology and catalytic activity of Fe3O4 were not changed.Cu-SBA-15 is prepared by hydrothermal crystallization method, and it is used as the catalyst.In the initial phenol concentration of 100mg/L, the processing liquid volume of 150 mL, the dosage of catalyst 0.1 g/L, the initial concentration of H2O2 1.1 g/L, the processing temperature 60℃, the pH value of the aqueous solution 6.8, the processing time of 120min, the phenol removal rate is 94.4%, COD removal rate can reach 59.3%.The same condition is applied in the treatment for petrochemical plant of wastewater(The initial phenol concentration of 181.79mg/L), the phenol removal rate 96.2%, COD removal rate can reach 67.0%.Based on the study of petrochemical plant, the existing treatment process is designed to improve the existing level, namely after the biochemical treatment process, adding an adsorption tower, first by active carbon fiber adsorption of phenol containing wastewater, adsorption saturation after the phenol desorbed, by catalytic wet peroxide oxidation catalysis oxidation of phenol from desorption process, so as to improve the processing efficiency and the processing effect of the actual wastewater. At present, thinking about the cost of adsorbent and catalyst, the application of the methods proposed by this paper can be used in the conditions of wastewater with high content of or amount of wastewater treatment in cases of relatively large.