Effect of Using Bubble Generator on Aeration Efficiency in Closed Fish Tank
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Abstract
Usage of air diffuser or jet aerator was a typical technique that used for oxygenation process. However, the occurred bubbles were unstable, rapidly floated to the water surface and small amount of dissolved oxygen level. The objective of this study was to increase the efficiency of air bubble generator to produce the microbubble applying the venturi and pressure. Venturi-type microbubble generator at various pressure (1, 2, 3, 4, 5 and 6 kg/cm2) and air diffuser were studied and compared. It was found that, the air bubbles from venturi-type microbubble generator without pressure and air diffuser were larger than 1 mm. Because of the unstable bubbles, the water only contained dissolved oxygen level at 3.72 mg/l. Whereas, the size of bubbles was decreased with increasing of the pressure level. Venturi-type microbubble generator with pressure at 6 kg/cm2 generated the microbubble size 46.13 µm, the water contained dissolved oxygen level at 7.40 mg/l which had the highest rate of dissolved oxygen level. Moreover, venturi-type microbubble generator with pressure at 6 kg/cm2 also had the highest in the oxygen transfer coefficient, oxygenation capacity, oxygen transfer rate and aerator efficiency which were 6.01 hr-1, 33.20x10-4 mg O2/hr, 3.70 mg O2/kW/hr and 6.90%, respectively.
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