PURPOSE: Provided is a device for dissolving gas which is useful in treating waste water as well as in manufacturing medicines, beverage and alcohol requiring gas for improved quality. CONSTITUTION: The device for dissolving gas includes the following compartments: i) a liquid storage tank (100) for storing supplied liquid; ii) a liquid pressure (200) for putting pressure on the supplied gas; iii) a gas mixer (400) for mixing gas to be mixed with the liquid; iv) a gas dissolver (500) for making gas mixed with the liquid bubbles; v) a valve (600) for supplying the liquid containing the bubbles; and vi) a reactor for gas dissolution (700). And the device effectively inserts oxygen, CO2, ozone gas etc. into liquid in the form of bubbles.
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