Decomposition of Brilliant Blue FCF in Water by Pulsed Power Discharge in a Water Droplets Spray

Summary form only given. We have been studying a decomposition of an organic compound in water by pulsed power discharge in a water droplets spray. Since sprayed water has a large reaction area and the discharge of gas phase generates uniformly a lot of streamers that generate OH radicals, ozone, high-energy electrons and radiate ultraviolet, decomposition efficiency increases by using this method. In this experiment, the dependence of the decomposition ratio of brilliant blue FCF on treatment time was compared with that of ozone oxidization. The treated brilliant blue FCF solution was 1 liter with concentration of 20 mg/L. An experimental setup consisted of a pulsed power generator and a discharge reactor. A pulsed high voltage was generated by a pulse transformer. The discharge reactor has coaxial electrodes that consist of a stainless wire of 0.28 mm diameter for applying pulse voltages and a cylindrical stainless mesh of 40 mm inner diameter and 300mm length for a ground electrode. The typical pulsed voltage and discharging current at a charging voltage of 25 kV were 25 kV with the pulse width of 70 ns (FWFIM) and 90 A, respectively. A repetition rate of the pulsed voltage was 100 pps. The treated water was sprayed into the reactor by a showerhead. The sprayed water was corrected and circulated into the reactor by a pump continuously. The decomposition ratios were measured by a UV and visible-light absorption spectrometer. A result shows that brilliant blue FCF was decolored by the circulation of 10 minutes.