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Study on Microwave-Enhanced ClO2 Catalytic Oxidation of Phenol in Water

Author: JiaoChunYan
Tutor: WangPeng
School: Harbin Institute of Technology
Course: Environmental Science and Engineering
Keywords: microwave-enhanced advanced oxidation process (MAOP) MnO_x/ACF ClO2 phenol wastewater treatment
CLC: X703.1
Type: Master's thesis
Year: 2008
Downloads: 71
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Abstract


In order to resolve the problems of nonbiodegradable wastewater treatment, micirowave-enhanced advanced oxidation process （MAOP） is founded in this paper. The preparing of heterogeneous catalysts with high activity and stability is one of key techniques in MAOP. In this paper, MnOx/ACF catalyst was prepared. The catalytic activity of MnOx/ACF catalyst was investigated in microwave enhanced ClO2 catatlytic oxidation process by using phenol as model pollutants. The related basic research was deeply vestigated.Firstly, the process of homogenous ClO2/Mn（Ⅱ） system catalytic oxidation of phenol-containing wastewater under microwave irradiation was studied. The relationships between removal percentage and catalyst dosage, microwave power, contact time and pH were irregular.The research suggested that the optimum conditions for the phenol removal percentage approaching 90.39% were as follows: the oxidant dosage was 80mg/L, the contact time was 5min, microwave power was 50W.MnOx/ACF was prepared by impregnation method using ACF as a carrier The catalytic activity and stability were investigated in MAOP. According to the structure analysis, Mn exists as MnO、MnO2 and Mn2O3 in MnOx/ACF with the loading amount of 1.13%.The process of microwave enhanced chlorine dioxide oxidation treating phenol wastewater was investigated by adding MnOx/ACF as a catalyst. 50mL synthetic wastewater containing 200 mg/L phenol was treated in MAOP and 80.91% of phenol and 67.23% of total organic carbon （TOC） could be removed under the optimum process conditions: ClO2 concentration 80 mg/L, microwave power 50W, contact time 6min, catalyst dosage 3 g/L, pH=6.The reaction kinetics in microwave enhanced ClO2 catatlytic oxidation process, microwave enhanced ClO2 oxidation process, traditional waterbath ClO2 catatlytic oxidation process and traditional waterbath ClO2 oxidation process were studied. Results suggested that the process between phenol and ClO2 oxidation reaction accords to pseudo first order reaction for phenol, rate constants of reaction kinetics were 0.1642、0.0756、0.0725、0.0417min-1 separately.Comparision of reaction constant in different treatments, it could be concluded in microwave enhanced ClO2 catatlytic oxidation process microwave irradiation and catalyst work together to improve the reaction rate.The fluorescence technology was applied to detect the regulation of hydroxyl radicals （·OH） created in microwave enhanced ClO2 catalytic oxidation process. The results showed that a lot of hydroxyl radicals were created in microwave enhanced ClO2 catalytic oxidation process. The mechanisms of organic pollutant degraded in microwave enhanced ClO2 catalytic oxidation process could be conluded: organic pollutant were absorbed on the surface of the catalyst, at the same time; microwave was focused on the surface of the catalyst which can absorb microwave. And microwave was transferred heat energy. So the catalyst was heated to very high temperature, which is called hot spot. Then organic pollutant were degraded by OH which produced by microwave enhanced ClO2 and high temperature of the hot spot formed on the surfaced of catalyst in the microwave field.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization > Technology and methods
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