The present invention relates to a nozzle for generating bubbles, and more particularly, to a method for efficiently generating minute bubbles required in a water treatment process using a dissolved air flotation method. Particularly, according to the present invention, by forming a radial orifice in a circular bubble generation port, not only the size and amount of minute bubbles can be efficiently controlled according to the water treatment capacity, but also the component in which the orifice is formed can be replaced, And the performance and life of the product can be improved. Further, the present invention can sufficiently increase the number of orifices, and the size of the discharge portion through which the generated minute bubbles are discharged can be maximized, so that a large amount of water treatment can be performed. Therefore, it is possible to improve reliability and competitiveness in the field of water treatment, especially in the water treatment field using the dissolved air floating method and the nozzle field for generating micro bubbles for the dissolved air floating method as well as similar or related fields.
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