Water Treatment with Pulsed Discharges Generated Inside Bubbles

作者：Sato Keisuke^*; Yasuoka Koichi; Ishii Shozo

来源：Electrical Engineering in Japan, 2010, 170(1): 1-7.

DOI：10.1002/eej.20918

• plasma in water
• pulsed plasma
• OH radical
• water treatment

The parallel operation of pulsed discharges generated inside bubbles is successfully demonstrated by applying a fast rising voltage to a multielectrode system immersed in treated water. A 10 ppm solution of acetic acid, which cannot be decomposed by ozone, was used as a persistent material and the acetic acid decomposition efficiency was evaluated by measuring the total organic carbon (TOC) values of the solution. The electric conductivity of the solution affected decomposition efficiency because the solution resistance, which was inversely proportional to the conductivity, limited the magnitude of the discharge current flowing along the surface of the bubbles generated by the feeding of oxygen or argon gas. With a nine-hole electrode system, the discharge power deposited in one discharge was lower, and the acetic acid decomposition efficiency was higher, than the values obtained with a single-hole electrode system. Lower discharge power seemed to minimize the self-quenching of OH radicals, and resulted in the efficient decomposition of acetic acid.

• 出版日期2010-1-15