Using a novel pulsed high-voltage gas-liquid hybrid discharge continuous reactor for removal of organic pollutant in oxygen atmosphere

A novel continuous reactor with gas-liquid hybrid discharge system was designed in order to remove abundant of contaminated water. The effects of pulsed high voltage, repetition frequency, liquid flow rate, initial concentration of 4-CP and oxygen flow rate on 4-CP removal and energy yield were investigated. At the initial concentration of 60 mg/l, the optimum conditions were pulsed high voltage of 16 kV, pulse repetition frequency of 100 Hz, liquid flow rate of 40 ml/min and oxygen flow rate of 0.4 m(3)/h. The removal efficiency of 4-CP was 88.3% and energy yield was 5.39 x 10(-9) mol/J. It was found that this continuous reactor is beneficial to degrading 4-CP efficiently with a high-energy yield. Ozone and hydrogen peroxide were largely formed and utilized efficiently for 4-CP removal. A model was established to predict the degradation of 4-CP and formations of intermediates (hydroquinone and 4-chlorocatechol) within each unit of the reactor. (c) 2007 Elsevier B.V. All rights reserved.