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Research information O2-No.1

Research information: Dissolution of oxygen gas

No.1 Influence of salinity on the dissolution of oxygen gas to the water
   with eco-Bubble®                   (Nov. 8, 2012)

Aims of the experiment: Micro/nano-bubble generator tends to produce less amount of micro/nano-bubbles in the freshwater due to smaller viscosity of the water. We tested the dissolution potential of oxygen gas of eco-Bubble®400 for the water with different salinities.

Experimental conditions: 0.4 m3 of freshwater in a tank was bubbled with nitrogen gas to decrease the DO satuation level of the water less than 20%. The water was aerated again with eco-Bubble®400, and the increase curve of DO saturation level was measured. The bubbling test of the water with eco-Bubble®400 was repeated to the water with different salinity (5 to 30), and the results of these tests were compared with that of the test with a conventional diffuser to the sea water.

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Results: Aerating the sea water (salinity 30) with an coventional diffuser took about 49 min. to increase the DO saturation level of the water from 20% to 50%, while bubbling the sea water with micro/nano-bubbles produced by eco-Bubble®400 required only four min. to recover the DO saturation level of the water to 50%. As the salinity of the water decreased, the time required to reach 50% in the DO saturation level was delayed gradually. However, even aerating the fresh water took only 7 and a half min. to reach 50% in the DO saturation level of the water. Thus, aerating the water with eco-Bubble®400 enables to dissolve oxygen gas into the water very efficiently.

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