The Effect of Scale-Up of Pulsed Corona Discharge for Treatment of Pollution Water Sprayed in Discharge Gap

We have studied the water treatment by spraying into a pulsed discharge space in air, to decompose refractory organic compounds included in industrial waste water. In practical application, a large quantity of water must be treated. Hence, we made a reactor with seven electrodes and a pulsed power generator of higher power. To verify the effect of the enlargement of water treatment system, the treatment of indigo carmine solution was carried out using seven-electrode reactor, and was compared with the treatment by a previous one-electrode reactor. When discharge energy and flow rate, which is seven times higher than that at one-electrode reactor, were given to seven-electrode reactor, time of the treatment by seven-electrode reactor was seven times shorter than that by one-electrode reactor. On the other hand, when the discharge energy and flow rate of both reactors were similar, the treatment time for seven-electrode reactor was shorter than that of the one-electrode reactor most likely due to a decrease of the disappeared ozone and OH radical. From these results, we conclude that it is possible to shorten the treatment time without decreasing the energy efficiency, by increasing both the number of the electrode and the discharge power.