Removal of phenol by activated alumina bed in pulsed high-voltage electric field |
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Authors: | ZHU Li-nan MA Jun and YANG Shi-dong |
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Institution: | School of Municipal and Environmental Engineering,Harbin Institute of Technology,Harbin 150090,China |
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Abstract: | A new process for removing the pollutants in aqueous solution-activated alumina bed in pulsed high-voltage electric field was investigated for the removal of phenol under different conditions. The experimental results indicated the increase in removal rate with increasing applied voltage, increasing pH value of the solution, aeration, and adding Fe2 . The removal rate of phenol could reach 72.1 % when air aeration flow rate was 1200 ml/min, and 88.2 % when 0.05 mmol/L Fe2 was added into the solution under the conditions of applied voltage 25 kV, initial phenol concentration of 5 mg/L, and initial pH value 5.5. The addition of sodium carbonate reduced the phenol removal rate. In the pulsed high-voltage electric field, local discharge occurred at the surface of activated alumina, which promoted phenol degradation in the thin water film. At the same time, the space-time distribution of gas-liquid phases was more uniform and the contact areas of the activated species generated from the discharge and the pollutant molecules were much wider due to the effect of the activated alumina bed. The synthetical effects of the pulsed high-voltage electric field and the activated alumina particles accelerated phenol degradation. |
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Keywords: | pulsed high-voltage electric field hybrid gas-liquid electrical discharge activated alumina phenol Fenton's reaction water treatment electric field activated alumina phenol degradation effects particles distribution contact species pollutant time thin water film local discharge surface addition sodium carbonate initial concentration flow rate |
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