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Study on α-FeOOH Catalyzed Ozonation for Degradation of Aquatic Organic Pollutants in Water

Author: YangYi
Tutor: MaJun
School: Harbin Institute of Technology
Course: Municipal Engineering
Keywords: Catalytic ozonation FeOOH Continuous Flow Natural organic matter
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 246
Quote: 0
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Abstract


To improve the quality of drinking water, the core issue is the removal of toxic trace organic pollutants, reduce disinfection byproducts. Chemical oxidation is one of the first choice for the removal of trace organic contaminants, the oxidant (ozone) is difficult to efficiently oxidative removal of high stability, large hazardous organic pollutants. As well as the lack of a clear process optimization and design parameters (such as residence time, amount of catalyst, etc.) to guide engineering practice. FeOOH as the main catalyst, OH instructions of chloronitrobenzene (pCNB) as organics. Tert-butanol and carbonate in the water samples, analysis of the reaction mechanism, found that under the experimental conditions, OH plays a major role in the degradation of nitrobenzene process, ozone alone process the OH generated mainly by water, a small amount of OH - induced OH generation in the catalytic ozonation process is mainly triggered by the catalyst surface hydroxyl groups. In addition, the degradation of the initial pH value of the solution, the dosage of the catalyst, the solution temperature, and inorganic anions will pCNB impact which the most significant change of the initial pH value and temperature. Most of the organic matter of natural waters is natural organic matter (NOM) NOM removal is very limited, conventional water treatment processes, the presence of NOM will produce disinfection by-products in the disinfection process, while making the pipe network bacterial secondary breeding seriously affect the quality of drinking water. -Depth study of the role of the law of the different catalytic ozonation water NOM, the test measures the oxidation process UV254 and DOC change, the change of the molecular weight distribution, and fluorescence spectroscopy filtered water oxidation NOM component structure and functional group changes. Ozone alone can effectively reduce filtered water aromatic ring or the number of organic conjugated bonds; FeOOH / O 3 oxidation filtered degree of mineralization of water, FeOOH / O 3 and MgO / O 3 oxide filtered water A type EEM fluorophore intensity was significantly reduced, and the oxidation of humic substances into smaller organic molecules. O 3 -FeOOH / O 3 can effectively reduce the aromaticity of the water, the ozone catalytic oxidation associated with the future development direction. In order to close the project actual continuous flow test the effects of ozone decomposition under different conditions, and the catalyst catalytic ozonation of methyl tert-butyl ether (MTBE). The FeOOH catalytic ozone oxidation of MTBE ability, the process has a strong anti-hydraulic shock load capacity.

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