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RESEARCH PAPER
Environmental Engineering Research 2005;10(3): 144-154.
ORGANIC POLLUTANTS DEGRADATION USING PULSELESS CORONA DISCHARGE : APPLICATION IN ULTRAPURE WATER PRODUCTION
Won-Tae Shin1, and Nak-Chang Sung2
1Marine Environment Division, Ministry of Marine Affairs and Fisheries
2Department of Environmental Engineering, Dong-A University
Corresponding Author: Nak-Chang Sung ,Tel: +82-51-200-7681, Fax: +82-51-200-7675, Email: ncsung@dau.ac.kr
Received: April 8, 2005;  Accepted: June 6, 2005.
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ABSTRACT
The use of ozone gained acceptance in the production of ultrapure water because of its powerful oxidizing ability. Ozone is currently used to deactivate microorganisms and remove organic contaminants. However, interest also exists in using radical species, which are stronger oxidants than ozone, in such processes. One means of producing radical species is by corona discharge. This work investigates the use of a novel pulseless corona-discharge system for the removal of organic substances in ultrapure water production. The method combines corona discharge with electrohydrodynamic spraying of oxygen, forming microbubbles. Experimental results show that pulseless corona discharge effectively removes organics, such as phenol and methylene blue, in deionized water. The corona-discharge method is demonstrated to be comparable to the direct use of ozone at a high-applied voltage. The results also show that a minimum applied voltage exists for operation of the corona-discharge method. In this work, the minimum applied voltage is approximately 4.5 kV. The kinetic rate of phenol degradation in the reactor is modeled. Modeling results show that the dominant species of the pulseless corona-discharge reactor are hydroxyl radical and aqueous electron. Several radical species produced in the pulseless corona-discharge process are identified experimentally. The major species are hydroxyl radical, atomic hydrogen species, and ozone.
Keywords: Ultrapure water | Corona discharge | Ozonation | Radical species
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