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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue May 2015, 36 (3)                                     Back


nstantaneous and historical temperature effects on a-pinene

Generation of dissolved O3 and OH radicals in water and O3 gas

with a submerged low-temperature dielectric barrier discharge plasma reactor 

 

Young Sik Lee1*, Hyoung Kyun Han1 and Cheong-Jo Cheong2

1Inland Aquaculture Research Center, National Fisheries Research and Development Institute, Changwon, Kyungnam 645-806, Korea

2Department of Environmental Engineering, Sunchon National University, Jeonnam, 540-950, Korea

*Corresponding Author?s Email : namdu@korea.kr

 

  

 Publication Data

Paper received:

14 February 2013

 

Revised received:

01 January 2014

 

Accepted:

19 May 2014

 

Abstract

Generation of O3 and OH radicals in water and O3 in air, using a low-temperature dielectric barrier plasma reactor was investigated to determine the optimal operating conditions of the plasma reactor in seawater and freshwater for fisheries. For seawater, increase in dissolved O3 concentration at air flows < 3 l min-1 was slow, while the rate increased rapidly at air flows > 4 l min-1. For freshwater, O3 concentration at air flows < 3 l min-1 increased slightly after 1 min and then remained unchanged. O3 concentrations were markedly higher at air flows of 5~7 l min-1 relative to those at air flows < 3 l min-1, but no further increase occurred after 4 min. The dissolved O3 concentration for 5.00 ppt salinity increased to > 2.5 mg l-1 for 20 min, while the concentration with added natural salt and refined salt increased to 0.6 mg l-1 at 5 min and did not increase further. The maximum concentration of dissolved OH radicals in seawater was observed at air flow rates of 5~7 l min-1, and the rate of OH radical production was affected much less by the air flow rate than O3 generation. The formation of OH radicals was similar in freshwater and seawater. O3 concentration in air increased more rapidly in freshwater than in seawater. An air flow rate of 3~4 l min-1 appeared to be optimal for minimizing the generation of O3 gas in air and maximizing the generation of OH radicals and O3 for maximum bactericidal effect and water purification.   

 

 

 Key words

O3 and OH radicals, Operating parameters, Plasma reactor

 

 

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