DECOMPOSITION OF 4-NITROPHENOL BY OZONATION IN A HOLLOW FIBER MEMBRANE REACTOR |
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Authors: | Hui Zhang Ming Jiang Daobin Zhang Qiang Xia |
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Affiliation: | 1. Department of Environmental Engineering , Wuhan University , Wuhan, China eeng@whu.edu.cn;3. Department of Environmental Engineering , Wuhan University , Wuhan, China;4. Department of Environmental Science , Wuhan University , Wuhan, China |
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Abstract: | The effect of initial pH, liquid flow rate, gas flow rate, and gaseous ozone concentration on the ozonation of 4-nitrophenol in a membrane reactor was investigated. The results showed that the disappearance of 4-nitrophenol increased with the increase of liquid flow rate, gas flow rate, and gaseous ozone concentration. The rise of the initial pH value led to an increase in 4-nitrophenol removal rate, but the increase became negligible after initial pH exceeded 9.5. The highest removal efficiency of 4-nitrophenol achieved was 94% after 100 min reaction when gaseous ozone concentration was 0.51 mmol L?1, gas flow rate was 57 mL min?1, liquid recirculation rate was 72 mL min?1, and initial pH was 10.3. The membrane reaction system could be modeled based on the lumped kinetics of 4-nitrophenol removal, and the corresponding rate constant of 4-nitrophenol removal was determined from the model. |
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Keywords: | 4-Nitrophenol Hollow fiber membrane reactor Lumped model Ozone |
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