A novel method for controlling the foam of water treatment process using pulsed high voltage discharge has been developed. Bubbles formed by sodium lauryl sulfate solution are used to simulate foam formed in water treatment. The bubbles are destroyed during explosion of discharge when passing the gap between the two horizontally fixed stainless steel mesh electrodes above the water surface. The air in bubbles is released and the growth speed of the foam then can be decreased. When the air flow rates are 0.005 m 3 ·s -1 , 0.075 m 3 ·s -1 and 0.1 m 3 ·s -1 , the most foam growth rates of 333mg·L -1 , 500mg·L -1 , 1000mg·L -1 sodium lauryl sulfate solution and can be reduced by pulsed discharge to 10%-30% of the original rate without discharging. The best mitigation rate is 43.1% of 333mg·L -1 sodium lauryl sulfate solution formed foam at the discharge voltage of 40 kV. The explosion of bubbles is the result of discharge streamers penetrating on the surface bubbles and the air released from the exploded surface bubbles.
Degradation of nitrobenzene by pulsed high voltage discharge in water, including the effects of discharge conditions and energy efficiency, has been primarily investigated using a needle-plate electrode pair. With the increase of applied voltage, decrease of discharge gap and conductivity of solution, nitrobenzene degradation rate increases. The 12 mg·L -1 nitrobenzene solution removal rate can reach 23.1% after discharged 60 minutes using needle-plate electrodes with a gap of 2.0 cm, an applied voltage of 45 kV and solution conductivity of 5.0 µs·cm -1 . The nitrobenzene degradation is considered to be related to the hydroxyl production in the discharge process. Part of the electric energy became heat of the solution for the solution temperature increase could be detected in the experiment. Energy efficiency analysis showed that low voltage, low discharge gap and low conductivity were favorable in the degradation. An optimum G value can reach 0.175 mmol·kWh -1 with the discharge voltage of 25 kV, discharge gap of 2.0 cm and the solution conductivity of 5.0 µs·cm -1 .
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