Aquatic environment

Removal of phenol by activated alumina bed in pulsed high-voltage electric field


ZHU Li-nan , MA Jun , YANG Shi-dong

DOI:

Received May 22, 2006,Revised September 30, 2006, Accepted , Available online

Volume 19,2007,Pages 409-415

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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 di erent 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 e ect of the activated alumina bed. The synthetical e ects of the pulsed high-voltage electric field and the activated alumina particles accelerated phenol degradation.

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