Synergistic effect of microwave plasma and ultrasonic wave on decomposition of organic compounds in water

摘要

To improve the decomposition efficiency of organic compounds dissolved in water, an ultrasonic wave was synchronously superposed to a microwave plasma produced under water. By changing the phase difference between the microwave plasma pulse and the ultrasonic wave, at a phase of instantaneous reduced pressure induced by the ultrasonic wave. This result suggests that the ultrasonic power can enhance OH radical formation by choosing the timing of the synchronously-injected pulsed microwave power. The decomposition rate from the viewpoint of energy efficiency was about four times larger with the ultrasonic wave superposition compared with the case of ordinary microwave plasma treatment without the ultrasonic superposition.