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KMID : 1024520150240070947
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Journal of the Environmental Sciences
2015 Volume.24 No. 7 p.947 ~ p.954
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Enhance of Dissolved Oxygen Rate using a 3-prong Nozzle
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Park Young-Seek
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Abstract
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Dielectric barrier discharge plasma is a new technique in water pollutant degradation, which that is characterized by the
production of chemically active species such as hydroxyl radicals, ozone, hydrogen peroxide, etc. If dissolving of plasma gas generated in the plasma reaction has increased, it is possible to increase the contaminant removal capacity. In this study, the improvement on the dissolving performance of plasma gas was evaluated by the indirect method measuring the overall oxygen transfer coefficient. Experiments were conducted to examine the effects of nozzle type, distance from water surface, air supply rate and liquid circulation rate. The experimental results showed that the KLa value of the 3-prong nozzle is 2.67 times higher than the diffuser. The order of KLa value with nozzle type ranked in the following order: 3-prong nozzle (inner diameter, less 1mm) > circular nozzle (inner diameter, 1.5 mm) > ellipse nozzle (short diameter 1 mm, long diameter 2.5 mm) > circular nozzle(inner diameter, 3 mm). Optimal liquid circulation rate was appeared to be 1.7 L/min, the value of KLa was 0.510 1/min. Thevalue of KLa with increasing air supply rate was revealed in the form of an exponential such as �ド�? �� �司哲慄貌潽�?�司哲禮憤狼憤� ??? ???? ???? .�ド�? �� �司哲慄貌潽�?�司哲禮憤狼憤� ??? ???? ??
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KEYWORD
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Gas flow rate, Nozzle, Oxidants dissolving, Overall oxygen transfer coefficient, Plasma
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