Investigation of quantity of active species generated by pulsed streamer discharges among electrodes with droplets for water treatment

Water pollution that is one of the environmental problems is caused by organic matters discharged in the river and the ocean. Therefore, currently, the method of improving the water quality by bacteria and chemicals is used as a waste water treatment technology. However, the organic matters that are difficult to decompose in the biological treatment exist. If those organic matters are discharged in the environment, there is a possibility of influencing the ecosystem harmfully as a environmental hormone. Therefore, as advanced water treatment, we are studying a method by pulsed discharge generated among electrodes with atomized waste water. The active species such as O3 and hydroxyl radical that have high oxidizing power are generated by the discharge, and those can decompose effectively the organic matters that are difficult to decompose. Therefore, improvement of the treatment speed and the treatment efficiency can be expected. In this method, quantity of hydroxyl radical generated in the discharge area is important. Therefore we have investigated the quantity of hydroxyl radical generated by pulsed streamer discharges among electrodes with droplets for water treatment.